Rusty rocks reveal ancient origin of photosynthesis

SUN-WORSHIP began even earlier than we thought. The world's oldest sedimentary rocks suggest an early form of photosynthesis may have evolved almost 3.8 billion years ago, not long after life appeared on Earth.

A hallmark of photosynthesis in plants is that the process splits water and produces oxygen gas. But some groups of bacteria oxidise substances like iron instead – a form of photosynthesis that doesn't generate oxygen. Evolutionary biologists think these non-oxygen-generating forms of photosynthesis evolved first, giving rise to oxygen-generating photosynthesis sometime before the Earth's atmosphere gained oxygen 2.4 billion years ago (New Scientist, 8 December 2012, p 12).

But when did non-oxygen-generating photosynthesis evolve? Fossilised microbial mats that formed in shallow water 3.4 billion years ago in what is now South Africa show the chemical fingerprints of the process. However, geologists have long wondered whether even earlier evidence exists.

The world's oldest sedimentary rocks – a class of rock that can preserve evidence of life – are a logical place to look, says Andrew Czaja of the University of Cincinnati in Ohio. These rocks, which are found in Greenland and date back almost 3.8 billion years, contain vast deposits of iron oxide that are a puzzle. "What could have formed these giant masses of oxidised iron?" asks Czaja.

To investigate, he analysed the isotopic composition of samples taken from the oxidised iron. He found that some isotopes of iron were more common than they would be if oxygen gas was indiscriminately oxidising the metal. Moreover, the exact isotopic balance varied subtly from point to point in the rock.

Both findings make sense if photosynthetic bacteria were responsible for the iron oxide, says Czaja. That's because these microbes preferentially oxidise only a small fraction of the dissolved iron, and the iron isotopes they prefer vary slightly as environmental conditions change (Earth and Planetary Science Letters, doi.org/kh5). His findings suggest that this form of photosynthesis appeared about 370 million years earlier than we thought.

It is "the best current working hypothesis for the origin of these deposits", says Mike Tice of Texas A&M University in College Station – one of the team who analysed the 3.4-billion-year-old microbial mats from South Africa.

William Martin at the University of Düsseldorf, Germany, agrees. "Anoxygenic photosynthesis is a good candidate for the isotope evidence they see," he says. "Had these fascinating results been collected on Mars, the verdict of the jury would surely remain open," says Martin Brasier at the University of Oxford. "But [on Earth] opinion seems to be swinging in the direction of non-oxygen-generating photosynthesis during the interval from 3.8 to 2.9 billion years ago."

This article appeared in print under the headline "Photosynthesis has truly ancient origins"

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Iran won't go beyond nuclear obligations: envoy

TEHRAN: Iran said Saturday it will not go beyond its obligations nor accept anything outside its rights under the non-proliferation treaty, ahead of talks with major powers over its disputed nuclear drive.

"We will not accept anything beyond our obligations and will not accept anything less than our rights," said the Islamic republic's top nuclear negotiator, Saeed Jalili, quoted by ISNA news agency.

"Iran has fulfilled its NPT obligations as an active and committed member, therefore should gain all of its rights," Jalili said in an address to Iranian nuclear industry officials.

His remarks come ahead of a meeting between Iran and six world powers -- Britain, China, France, Russia, the United States and Germany -- in Kazakhstan on Tuesday.

The talks will be the first between the parties since three rounds of meetings in Moscow ended in stalemate in June last year.

The so-called P5+1 called on Iran to scale back on uranium enrichment, the process which used for power plant fuel and in higher purities needed for a nuclear weapon.

But they stopped short of offering Tehran substantial relief from UN Security Council and unilateral Western sanctions that last year began to cause major economic problems for the Gulf country.

Iran denies seeking atomic weapons but many in the international community suspect otherwise.

-AFP/fl

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Crave Ep. 110: Prevent a hangover with the worlds first 'sober pill'?

Prevent a hangover with the worlds first 'sober pill'? Ep 110

Subscribe to Crave:

iTunes (HD) | iTunes (SD) | iTunes (HQ)

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Cheers! Scientists have created what may be the world's first pill that can make you sober if you've gone a little too far with the booze. Russian meteorite fragments go up for sale on online, as do Milla Jovovich's shorts. And later this year a man will have surgery to attach a bionic hand that can feel touch sensations.

Crave stories:

- Russian meteorite fragments pop up for sale online

- Amazon opens celebrity memorabilia store

- Nanotech 'sober pill' could one day de-drunk you

- This sheet turns your windows into mirrors

- Man to get first bionic hand that can 'feel'

- Sony PS4 event skewered in animated parody

- Crave giveaway! Kanex Sydnee four-port recharging station

Social networking:

- Stephen on Twitter

- Stephen on Google+

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Space Pictures This Week: Space Rose, Ghostly Horses

• 
  
  
  
  
  
  
  

  Space Rose

  Image courtesy T.A. Rector and H. Schweiker, UAA/WIYN/NOAO/NSF

  Planetary nebula Sh2-174 "blooms" like a rose in a picture released this week by the National Optical Astronomy Observatory (NOAO).

  Nebulae are created when low-mass stars shed their outer layers at the end of their lives. The core of the dying star, called a white dwarf, usually remains at the center of the nebula.

  But not so for the oddly positioned Sh2-174: Its white dwarf is located in the right part of the nebula, in the blue gas pictured above. (See more nebula pictures.)

  Published February 22, 2013

  
  











• 
  
  
  
  
  
  
  

  Universal Delivery

  Photograph courtesy NASA

  An unpiloted resupply vehicle snapped this picture as it approached the International Space Station this week.

  The vehicle provided the 34 crew members on board with essential supplies, including oxygen, water, spare parts, even logistics equipment—2.9 tons of supplies in all. (See pictures of early U.S. spaceflight.)

  Published February 22, 2013

  
  











• 
  
  
  
  
  
  
  

  Everglades of Europe

  Image courtesy Jesse Allen and Robert Simmon, EO-1/NASA/USGS

  The Danube cuts a jade path across part of the Danube Biosphere Reserve in the Ukraine on its way to the Black Sea in an image captured February 5 by NASA's Earth Observing-1 satellite.

  Europe's largest river, the Danube spans 309,447 square miles (801,463 square kilometers) and winds its way through 19 countries.

  Called the "Everglades of Europe," the Danube delta is home to more than 300 species of birds and 45 species of fish, according to NASA's Earth Observatory. (See more river pictures.)

  Published February 22, 2013

  
  











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  Bird's-Eye View

  Image by Maurizio Cabibbo, My Shot

  Photographer Maurizio Cabibbo submitted this picture of the chaotic center of the Cygnus, or Swan, constellation on February 11 to the National Geographic photo community My Shot.

  Resembling a swan flying across the night sky, Cygnus is easily seen in the summer in the Northern Hemisphere, according to NASA.

  Published February 22, 2013

  
  











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• 
  
  
  
  
  
  
  

  Spirit Horses

  Photograph by Andre Erlich, Your Shot

  An aurora casts a ghostly glow over horses in northern Iceland in a picture submitted to National Geographic's My Shot photography community on February 18.

  Named after Aurora, the Roman goddess of dawn, the vivid beams of light from aurora borealis result from collisions between charged particles released from the sun's atmosphere and gaseous particles in Earth's atmosphere. (See more aurora pictures: "Solar Flare Sparks 'Snakes,' 'Spears.'")

  Published February 22, 2013

  
  











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  Image courtesy SDO/NASA

  Published February 22, 2013

  
  

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Great Energy Challenge Blog

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Cyberattacks Bring Attention to Security Reform

Recent accusations of a large-scale cyber crime effort by the Chinese government left many wondering what immediate steps the president and Congress are taking to prevent these attacks from happening again.

On Wednesday, the White House released the administration's Strategy on Mitigating the Theft of U.S. Trade Secrets as a follow-up to the president's executive order. The strategy did not outwardly mention China, but it implied U.S. government awareness of the problem.

"We are taking a whole of government approach to stop the theft of trade secrets by foreign competitors or foreign governments by any means -- cyber or otherwise," U.S. Intellectual Property Enforcement Coordinator Victoria Espinel said in a White House statement.

As of now, the administration's strategy is the first direct step in addressing cybersecurity, but in order for change to happen Congress needs to be involved. So far, the Cyber Intelligence Sharing and Protection Act (CISPA) is the most notable Congressional legislation addressing the problem, despite its past controversy.

Last April, CISPA was introduced by House Intelligence Committee Chairman Mike Rogers, R-Mich., and Rep. Dutch Ruppersberger, D-Md. The act would allow private companies with consumer information to voluntarily share those details with the NSA and the DOD in order to combat cyber attacks.

Peter Parks/AFP/Getty Images

The companies would be protected from any liabilities if the information was somehow mishandled. This portion of the act sounded alarm bells for CISPA's opponents, like the ACLU, which worried that this provision would incentivize companies to share individuals' information with disregard.

CISPA passed in the House of Representatives, despite a veto threat from the White House stemming from similar privacy concerns. The bill then died in the Senate.

This year, CISPA was reintroduced the day after the State of the Union address during which the president declared an executive order targeting similar security concerns from a government standpoint.

In contrast to CISPA, the executive order would be initiated on the end of the government, and federal agencies would share relevant information regarding threats with private industries, rather than asking businesses to supply data details. All information shared by the government would be unclassified.

At the core of both the executive order and CISPA, U.S. businesses and the government would be encouraged to work together to combat cyber threats. However, each option would clearly take a different route to collaboration. The difference seems minimal, but has been the subject of legislative debates between the president and Congress for almost a year, until now.

"My response to the president's executive order is very positive," Ruppersberger told ABC News. "[The president] brought up how important information sharing is [and] by addressing critical infrastructure, he took care of another hurdle that we do not have to deal with."

Addressing privacy roadblocks, CISPA backers said the sharing of private customer information with the government, as long as personal details are stripped, is not unprecedented.

"Think of what we do with HIPAA in the medical professions; [doctors do not need to know] the individual person, just the symptoms to diagnose a disease," Michigan Gov. John Engler testified at a House Intelligence Committee hearing in an attempt to put the problem into context.

Read More..

Spidey-sense suit tingles when someone gets too close

FOR Peter Parker, it was a tingling sensation that alerted him to an imminent threat. Now anyone can pretend to be Spider-Man by simply donning a suit that lets you feel how close you are to a nearby object. It can even let the wearer navigate with their eyes closed.

The suit, called SpiderSense and built by Victor Mateevitsi of the University of Illinois in Chicago has small robotic arms packaged in modules with microphones that send out and pick up ultrasonic reflections from objects. When the ultrasound detects someone moving closer to the microphone, the arms respond by exerting a growing pressure on the body. Seven of these modules are distributed across the suit to give the wearer as near to 360 degree ultrasound coverage as possible.

"When someone is punching Spider-Man, he feels the sensation and can avoid it. Our suit is the same concept," says Mateevitsi. SpiderSense could help blind people to find their way more easily, he says.

Mateevitsi tested the suit out on students, getting them to stand outside on campus, blindfolded, and "feel" for approaching attackers. Each wearer had ninja cardboard throwing stars to use whenever they sensed someone approaching them. "Ninety five per cent of the time they were able to sense someone approaching and throw the star at them," says Mateevitsi.

"I'm very excited about this," says Gershon Dublon of the Massachusetts Institute of Technology, who also works on augmenting parts of the human body. Mateevitsi's work is a step on the road to giving humans truly integrated extrasensory perception, says Dublon.

Mateevitsi wants to use the suit, or just a few sensors on the arms and back, to boost cyclists' awareness of other traffic on the road. SpiderSense is due to be presented at the Augmented Human conference in Stuttgart, Germany, in March. The team now plans to add more sensors to the suit to increase its resolution.

"We humans have the senses that we are born with and we can't extend them," Mateevisti says. "But there are some threats which are very deadly, but we can't sense them, like radiation. Electronic sensors can feel those threats."

The team also plans to begin trials of SpiderSense with visually impaired people.

This article appeared in print under the headline "Back off, my Spidey senses tell me you're too close"

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

All comments should respect the New Scientist House Rules. If you think a particular comment breaks these rules then please use the "Report" link in that comment to report it to us.

If you are having a technical problem posting a comment, please contact technical support.

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Spate of blasts killed 83 in Damascus' deadliest day

DAMASCUS: A spate of bombings across Damascus killed at least 83 people in the deadliest day for the capital since Syria's war erupted, a watchdog said Friday, as the opposition discussed a plan for peace talks with the regime.

Thursday's biggest bombing, which both the regime and its opponents blamed on "terrorists", killed 61 people and left a trail of destruction in the city centre, said the Syrian Observatory for Human Rights.

The attack, in Mazraa district, was carried out by a suicide bomber who detonated his explosives-laden car near the entrance of the Baath party's main offices, said the Britain-based monitor.

Gruesome images of charred bodies next to mangled vehicles were shown on state television, which said children were among the casualties in the explosion near a school.

The blast wounded more than 200 people in a wide radius, including Nayef Hawatmeh, the head of the Democratic Front for the Liberation of Palestine, which said he was hit by flying glass in his office 500 metres (yards) away.

Russian news agencies reported the windows of Moscow's embassy were blown out, although no staff was hurt.

Another 22 people were killed in an apparently coordinated triple bombing targeting security headquarters in the northern Damascus district of Barzeh on Thursday, including 19 members of the forces, said the Observatory.

Attacks have increasingly targeted government or security buildings in Damascus in recent months, many of them claimed by the jihadist Al-Nusra Front which Washington has designated as a "terrorist" organisation.

The attacks were condemned by both the regime of President Bashar al-Assad and the umbrella opposition National Coalition, as well as the United States, Russia and UN chief Ban Ki-moon.

There was no still claim of responsibility for the Mazraa blast.

The Syrian foreign ministry alleged the bombing was "carried out by armed terrorist groups linked to Al-Qaeda that receive financial and logistic help from abroad", using government terminology for rebels.

The opposition also denounced the bombers as "terrorists".

"Any acts targeting civilians with murder or human rights violations are criminal acts that must be condemned, regardless of the perpetrator or the justification," said the National Coalition.

Elsewhere, 38 people were killed Thursday in Daraa, birthplace of the revolt in the country's south, including 18 in an air raid on a medical centre, said the Observatory.

Also in Daraa, six women and a child all from the same family were killed in an explosion at Tsil, and 10 more civilians died in army shelling of Jassem town.

In the northwestern province of Idlib, where sectarian strife has been rising, 40 Shiites kidnapped by an armed group and 300 Sunnis abducted in reprisals last week were released after mediation talks between families.

The majority of the Syrian population fighting the Assad regime are Sunni Muslims, while the president and his clan belong to the Alawite branch of Shiite Islam.

The attacks added urgency to the National Coalition meeting in Cairo, where discussions will continue later on Friday focused on an offer by its chief to talk directly with the regime.

Coalition chairman Ahmed Moaz al-Khatib has offered to talk to regime officials without "blood on their hands" -- an initiative welcomed by the Arab League and the United States as well as Assad allies Iran and Russia.

But the Syrian National Council, a key part of the Coalition, has rejected any talks until Assad quits, and the regime says it will negotiate only without preconditions.

At the United Nations, Russia accused US diplomats of blocking a Security Council condemnation of the Mazraa attack. Other diplomats said however that Russia had refused to include language criticising Assad.

The UN says at least 70,000 people have been killed in the conflict which was sparked by a bloody regime crackdown on Arab Spring-inspired protests that broke out in March 2011.

-AFP/fl

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Crave giveaway: Kanex Sydnee four-port recharging station

Congrats to Johnal L. of Costa Mesa, Calif., for winning a pair of Aperio Audio Verus Forte speakers in last week's giveaway. This week's prize is sure to get the winner all charged up.

We're giving away a Kanex Sydnee recharging station, which charges up to four iOS devices at once through its four 2.1-amp USB ports. It works with all iPhones and iPads, and would be quite happy in any iFriendly home, office, or classroom looking to keep its gear organized and powered up.

A side view.

(Credit:
Kanex)

The unit plugs into a wall socket and comes with three USB cables so you can start multi-charging right out of the box. While the Sydnee's marketed as a charging station for iDevices, it'll work with just about any USB-powered device.

Normally, a Kanex Sydnee would cost you $149, but you have the chance to score one for free. How do you go about doing that? Well, like this:

• Register as a CNET user. Go to the top of this page and hit the Join CNET link to start the registration process. If you're already registered, there's no need to register again.


• Leave a comment below. You can leave whatever comment you want. If it's funny or insightful, it won't help you win, but we're trying to have fun here, so anything entertaining is appreciated.


• Leave only one comment. You may enter for this specific giveaway only once. If you enter more than one comment, you will be automatically disqualified.
  


• The winner will be chosen randomly. The winner will receive one (1) Kanex Sydnee, with a retail value of $149.


• If you are chosen, you will be notified via e-mail. The winner must respond within three days of the end of the sweepstakes. If you do not respond within that period, another winner will be chosen.


• Entries can be submitted until Monday, February 25, at 12 p.m. ET.

And here's the disclaimer that our legal department said we had to include (sorry for the caps, but rules are rules):

NO PURCHASE NECESSARY TO ENTER OR WIN. A PURCHASE WILL NOT INCREASE YOUR CHANCES OF WINNING. YOU HAVE NOT YET WON. MUST BE LEGAL RESIDENT OF ONE OF THE 50 UNITED STATES OR D.C., 18 YEARS OLD OR AGE OF MAJORITY, WHICHEVER IS OLDER IN YOUR STATE OF RESIDENCE AT DATE OF ENTRY INTO SWEEPSTAKES. VOID IN PUERTO RICO, ALL U.S. TERRITORIES AND POSSESSIONS, AND WHERE PROHIBITED BY LAW. Sweepstakes ends at 12 p.m. ET on Monday, February 25, 2013. See official rules for details.

Good luck.

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Oldest Known Wild Bird Hatches Chick at 62

Wisdom, the oldest known wild bird, has yet another feather in her cap—a new chick.

The Laysan albatross (Phoebastria immutabilis)—62 years old at least—recently hatched a healthy baby in the U.S. Midway Atoll National Wildlife Refuge, her sixth in a row and possibly the 35th of her lifetime, according to the U.S. Geological Survey's (USGS) North American Bird Banding Program. (Related: "51-Year-Old Albatross Breaks N. American Age Record [2003].")

But Wisdom's longevity would be unknown if it weren't for a longtime bird-banding project founded by USGS research wildlife biologist Chandler Robbins.

Now 94, Robbins was the first scientist to band Wisdom in 1956, who at the time was "just another nesting bird," he said. Over the next ten years, Robbins banded tens of thousands of black-footed albatrosses (Phoebastria nigripes) and Laysan albatrosses as part of a project to study the behavior of the large seabirds, which at the time were colliding with U.S. Navy aircraft.

Robbins didn't return to the tiny Pacific island—now part of the U.S. Papahānaumokuākea Marine National Monument—until 2002, when he "recaptured as many birds as I could in hopes that some of them would be the old-timers."

Indeed, Robbins did recapture Wisdom—but he didn't know it until he got back to his office at the Patuxent Wildlife Research Center in Laurel, Maryland, and checked her band number in the database.

"That was real exciting, because we didn't think the chances of finding one that old would be that good," Robbins said Wednesday in an interview from his office at the Patuxent center, where he still works.

Chandler Robbins counts birds in Maryland's Patuxent Research Refuge.

Photograph by David H. Wells, Corbis

Albatrosses No Bird Brains

Bigger birds such as the albatross generally live longer than smaller ones: The oldest bird in the Guinness Book of Animal Records, a Siberian white crane (Leucogeranus leucogeranus), lived an unconfirmed 82 years. Captive parrots are known to live into their 80s. (See National Geographic's bird pictures.)

The Laysan albatross spends most of the year at sea, nesting on the Midway Atoll (map) in the colder months. Birds start nesting around five years of age, which is how scientists knew that Wisdom was at least five years old in 1956.

Because albatrosses defend their nests, banding them doesn't require a net or a trap as in the case of other bird species, Robbins said—but they're far from tame.

"They've got a long, sharp bill and long, sharp claws—they could do a job on you if you're not careful how to handle them," said Robbins, who estimates he's banded a hundred thousand birds.

For instance, "when you're not looking, the black-footed albatross will sneak up from behind and bite you in the seat of the pants."

But Robbins has a fondness for albatrosses, and Wisdom in particular, especially considering the new dangers that these birds face.

Navy planes are no longer a problem—albatross nesting dunes were moved farther from the runway—but the birds can ingest floating bits of plastic that now inundate parts of the Pacific, get hooked in longlines meant for fish, and be poisoned by lead paint that's still on some of Midway Atoll's buildings. (Also see "Birds in 'Big Trouble' Due to Drugs, Fishing, More.")

That Wisdom survived so many years avoiding all those hazards and is still raising young is quite extraordinary, Robbins said.

"Those birds have a tremendous amount of knowledge in their little skulls."

"Simply Incredible"

Wisdom's accomplishments have caught the attention of other scientists, in particular Sylvia Earle, an oceanographer and National Geographic Explorer in Residence, who said by email that Wisdom is a "symbol of hope for the ocean." (National Geographic News is part of the National Geographic Society.)

Earle visited Wisdom at her nest in January 2012, where she "appeared serenely indifferent to our presence," Earle wrote in the fall 2012 issue of the Virginia Quarterly Review.

"I marveled at the perils she had survived during six decades, including the first ten or so years before she found a lifetime mate. She learned to fly and navigate over thousands of miles to secure enough small fish and squid to sustain herself, and every other year or so, find her way back to the tiny island and small patch of grass where a voraciously hungry chick waited for special delivery meals."

Indeed, Wisdom has logged an estimated two to three million miles since 1956—or four to six trips from Earth to the moon and back, according to the USGS. (Related: "Albatross's Effortless Flight Decoded—May Influence Future Planes.")

Bruce Peterjohn, chief of the North American Bird Banding Program, called Wisdom's story "simply incredible."

"If she were human, she would be eligible for Medicare in a couple years—yet she is still regularly raising young and annually circumnavigating the Pacific Ocean," he said in a statement.

Bird's-Eye View

As for Robbins, he said he'd "love to get out to Midway again." But in the meantime, he's busy going through thousands of bird records in an effort to trace their life histories.

There's much more to learn: For instance, no one has ever succeeded in putting a radio transmitter on an albatross to follow it throughout its entire life-span, Robbins noted.

"It would be [an] exciting project for someone to undertake, but I'm 94 years old," he said, chuckling. "It wouldn't do much for me to start a project at my age."

Read More..

Arias Challenged On Pedophilia Claim

Accused murderer Jodi Arias was challenged today by phone records, text message records, and her own diary entries that appeared to contradict her claim that she caught her ex-boyfriend, Travis Alexander, looking at pictures of naked boys.

Arias had said during her testimony that one afternoon in January 2008, she walked in on Alexander masturbating to pictures of naked boys. She said she fled from the home, threw up, drove around aimlessly, and ignored numerous phone calls from Alexander because she was so upset at what she had seen.

The claim was central to the defense's accusation that Alexander was a "sexual deviant" who grew angry and abusive toward Arias in the months after the incident, culminating in a violent confrontation in June that left Alexander dead.

Arias claimed she killed him in self-defense. She could face the death penalty if convicted of murder.

Catching Up on the Trial? Check Out ABC News' Jodi Arias Trial Coverage

Today, prosecutor Juan Martinez, who has been aggressive in questioning witnesses throughout the trial, volleyed questions at her about the claim of pedophilia, asking her to explain why her and Alexander's cell phone records showed five calls back and forth between the pair throughout the day she allegedly fled in horror. Some of the calls were often initiated Arias, according to phone records.

Jodi Arias Doesn't Remember Stabbing Ex-Boyfriend Watch Video

Jodi Arias Murder Trial: Testimony About Ex's Death Watch Video

Arias on Ex-Boyfriend's Death: 'I Don't Remember' Watch Video

She and Alexander also exchanged text messages throughout the afternoon and evening at a time when Arias claims the pedophilia incident occurred. In those messages they discuss logistics of exchanging one another's cars that night. Alexander sends her text messages about the car from a church social event he attended that night that she never mentioned during her testimony.

Arias stuck by her claim that she saw Alexander masturbating to the pictures, and her voice remained steady under increasingly-loud questioning by Martinez.

But Martinez also sparred with Arias on the stand over minor issues, such as when he asked Arias detailed questions about the timing and order of events from that day and Arias said she could not remember them.

"It seems you have problems with your memory. Is this a longstanding thing? Since you started testifying?" Martinez asked.

"No it goes back farther than that. I don't know even know if I'd call it a problem," Arias said.

"How far back does it go? You don't want to call them problems, are they issues? Can we call them issues? When did you start having them?" he asked in rapid succession. "You say you have memory problems, that it depends on the circumstance. Give me the factors that influence that."

"Usually when men like you or Travis are screaming at me," Arias shot back from the stand. "It affects my brain, it makes my brain scramble."

"You're saying it's Mr. Martinez's fault?" Martinez asked, referring to himself in the third person.

"Objection your honor," Arias' attorney finally shouted. "This is a stunt!"

Timeline of the Jodi Arias Trial

Martinez dwelled at one point about a journal entry where Arias wrote that she missed the Mormon baptism of her friend Lonnie because she was having kinky sex with Alexander. He drew attention to prior testimony that she and Alexander used Tootsie Pops and Pop Rocks candy as sexual props.

"You're trying to get across (in the diary entry) that this involved a sexual liaison with Mr. Alexander right?" he asked. "And you're talking about Tootsie Pops and Pop Rocks?"

"That happened also that night," Arias said.

"You were there, enjoying it, the Tootsie Pops and Pop Rocks?" he asked again, prompting a smirk from Arias.

"I enjoyed his attention," Arias said.

Read More..

Tobacco giant wants to help you quit smoking

British American Tobacco aims to turn electronic cigarettes into medicines in the UK. It's a welcome move, but leaves a bitter taste in the mouth

BACK in the 1950s, when the dangers of smoking were becoming clear and the tobacco industry was panicked, cigarette-makers came up with a wheeze: safer smokes. Filter-tipped, low-tar and "light" cigarettes were the result.

In reality, those cigarettes were not safer at all. Smokers inhaled more deeply or smoked more. And the industry knew it. Internal documents later revealed that they cynically promoted safer cigarettes to discourage people from quitting.

Given this history of smoke and mirrors, you could be forgiven for being suspicious when a tobacco company announces that it is investing in a "reduced risk" cigarette. In December, British American Tobacco (BAT) bought a company called CN Creative, which makes "electronic cigarettes". It is now planning to ask the UK authorities to recognise one of its products as a smoking-cessation medicine.

History repeating? Probably not. You could argue that aiming to profit from curing an addiction that you helped cause in the first place is pretty cynical. But credit where it is due: BAT and other tobacco companies now openly admit that smoking is a serious health risk. There is mounting evidence that e-cigarettes are safer than smoking and really can help addicts cut down or quit. They seem especially useful for hard-core smokers who have failed to quit or who don't even want to try (see "E-cigarettes may soon be sold as life-saving medicine").

There are still unanswered scientific questions, including how e-cigarettes compare with existing medicines such as nicotine patches. That will form a big part of the debate on whether to license them as a medicine.

Long-term safety is also open to question, as is whether they will serve as a "gateway" product attracting new people to smoking, and if their use in public places will renormalise smoking at a time when it is increasingly frowned upon.

But again, the evidence is pointing in the right direction. Tellingly, the anti-tobacco group Action on Smoking and Health has given a qualified backing to e-cigarettes for harm reduction. ASH sensibly points out that e-cigarettes are clearly safer than inhaling tobacco smoke, and says there is little evidence that they will attract non-smokers or make smoking acceptable again. If so, there is little reason to worry about unintended consequences.

Don't hold your breath, though. A similar argument has been made for "snus", a form of oral tobacco mainly used in Sweden. There is evidence that it can help smokers quit and that it is safer than smoking. Sweden has the lowest rates of smoking and lung cancer in Europe, which is often attributed to the use of snus. By some estimates, if Sweden's snus habit was replicated across the European Union it would prevent 92,000 lung cancer deaths a year (Scandinavian Journal of Public Health, vol 37, p 481). And yet it remains illegal everywhere in the EU but Sweden, condemned as a carcinogen and a potential gateway to smoking. The lesson? Harm reduction is a tough sell.

It may be distasteful to watch a tobacco company spearhead a campaign for cigarette harm reduction. But action is sorely needed. If the evidence stacks up, they should be given the benefit of the doubt – for now.

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Malaysian driver, Myanmar national arrested at Woodlands Checkpoint

SINGAPORE: A Malaysian driver and a Myanmar national have been arrested at Woodlands Checkpoint.

They were caught at about 12.25am on Thursday after immigration officers checked a Malaysian-registered car that was leaving Singapore.

When the driver opened the car boot, the officers found a man hiding inside.

The driver, 26, and the Myanmar national, 62, were arrested and are being investigated.

The vehicle used in the commission of the offences has been detained and is liable for forfeiture.

The penalties for overstaying or illegal entry are a jail term of up to six months plus a minimum of three strokes of the cane, while the penalties for illegal departure is a fine of up to $2,000, a jail term of up to six months, or both.

- CNA/de

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Social pollution masks? Winning wearable tech ideas

The Tree Voice concept lets anyone walk up and interact with a tree and get updates on the local environment.

(Credit:
Frog Design)

While anyone could dream up a spinning virtual GPS globe constantly updated with a slideshow of global Flickr photos emanating from a hat, competitors in Frog Design's contest for new wearable technology concepts had to keep their designs within the realm of feasibility.

The key requirement that keeps all the designs within reason is that they have to be able to come to market within three years. That doesn't necessarily mean they will come to market, but at least there's a chance.

The global design firm ran its internal competition for new wearable technology concepts last year and just unveiled the results (PDF). They include some fun and fascinating ideas that explore everything from communing with trees through technology to an urban compass that leads you into discovering unexpected parts of a city.

The eight winners came from around the world. There's Mnemo, an interactive friendship bracelet from Amsterdam that records times, locations, people, media, and music to create a record of an event. These digital memories can be shared with friends and combined into a collective memory, all wearable on a bracelet.

The Tree Voice concept hails from Austin, Texas. It involves attaching a display to a tree. The display communicates data gathered from sensors to share information on pollution, noise, and temperature levels. Anyone can walk up and interact with the tree and get updates on the local environment.

My personal favorite of the top eight designs is the CompassGo from Milan. It's a round device that fits in the palm of your hand. You tell it what you're interested in (like boutique shopping, history, independent restaurants, or culture) and it leads you through a city with visual cues. There's no guidebook to shackle you down, you just follow and discover the lesser-known parts of a city. It could add a real spark of adventure for tourists.

The other top designs include an interactive tool for the blind to navigate their environments, a device that harnesses the energy of physical movement, a wristband that helps wearers navigate the New York subway system, a pollution mask that monitors and shares air quality information, and a maker kit to get girls into creating their own wearable technology.

With so much attention being paid to smartwatches, it's encouraging to see designers branching out with creative ideas in other wearable spaces. Knowing that all these designers believe their concepts could be made real within just a few years, we may soon be welcoming some of them into the world. I, for one, can't wait to get my CompassGo.

HelloWorld is a wearable tech creation kit geared for preteen girls.

(Credit:
Frog)

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NASA's Mars Rover Makes Successful First Drill

For the first time ever, people have drilled into a rock on Mars, collecting the powdered remains from the hole for analysis.

Images sent back from NASA's Mars rover Curiosity on Wednesday confirmed that the precious sample is being held by the rover's scoop, and will soon be delivered to two miniature chemical labs to undergo an unprecedented analysis. (Related: "Mars Rover Curiosity Completes First Full Drill.")

To the delight of the scientists, the rock powder has come up gray and not the ubiquitous red of the dust that covers the planet. The gray rock, they believe, holds a lot of potential to glean information about conditions on an early Mars. (See more Mars pictures.)

"We're drilling into rock that's a time capsule, rocks that are potentially ancient," said sampling-system scientist Joel Hurowitz during a teleconference from NASA's Jet Propulsion Laboratory in California.

A Place to Drill

The site features flat bedrock, often segmented into squares, with soil between the sections and many round gray nodules and white mineral veins.

Hurowitz said that the team did not attempt to drill into the minerals or the gray balls, but the nodules are so common that they likely hit some as they drilled down 2.5 inches (6.3 centimeters).

In keeping with the hypothesis that the area was once under water, Hurowitz said the sample "has the potential of telling us about multiple interactions of water and rock."

The drill, located at the end of a seven-foot (two-meter) arm, requires precision maneuvering in its placement and movement, and so its successful initial use was an exciting and welcome relief. The rover has been on Mars since August, and it took six months to find the right spot for that first drill. (Watch video of the Mars rover Curiosity.)

The flat drilling area is in the lower section of Yellowknife Bay, which Curiosity has been exploring for more than a month. What was previously identified by Curiosity scientists as the dry bed of a once-flowing river or stream appears to fan out into the Yellowknife area.

The bedrock of the site—named after deceased Curiosity deputy project manager John Klein—is believed to be siltstone or mudstone. Scientists said the veins of white minerals are probably calcium sulfate or gypsum, but the grey nodules remain something of a mystery.

Triumph

To the team that designed and operates the drill, the results were a triumph, as great as the much-heralded landing of Curiosity on the red planet. With more than a hundred maneuvers in its repertoire, the drill is unique in its capabilities and complexities. (Watch video of Curiosity's "Seven Minutes of Terror.")

Sample system chief engineer Louise Jandura, who has worked on the drill for eight years, said the Curosity team had made eight different drills before settling on the one now on the rover. The team tested each drill by boring 1,200 holes on 20 types of rock on Earth.

She called the successful drilling "historic" because it gives scientists unprecedented access to material that has not been exposed to the intense weathering and radiation processes that affect the Martian surface.

Mini-laboratories

The gray powder will be routed to the two most sophisticated instruments on Curiosity—the Sample Analysis at Mars (SAM) and Chemistry and Mineralogy (CheMin).

SAM, the largest and most complex instrument onboard, operates with two ovens that can heat the sample up to 1,800°F (982°C), turning the elements and compounds in the rock into gases that can then be identified. SAM can also determine whether any carbon-based organic material is present.

Organics are the chemical building blocks of life on Earth. They are known to regularly land on Mars via meteorites and finer material that rains down on all planets.

But researchers suspect the intense radiation on the Martian surface destroys any organics on the surface. Scientists hope that organics within Martian rocks are protected from that radiation.

CheMin shoots an X-ray beam at its sample and can analyze the mineral content of the rock. Minerals provide a durable record of environmental conditions over the eons, including information about possible ingredients and energy sources for life.

Both SAM and CheMin received samples of sandy soil scooped from the nearby Rocknest outcrop in October. SAM identified organic material, but scientists are still trying to determine whether any of it is Martian or the byproduct of organics inadvertently brought to Mars by the rover. (See "Mars Rover Detects Simple Organic Compounds.")

In the next few days, CheMin will be the first to receive samples of the powdered rock, and then SAM. Given the complexity of the analysis, and the track record seen with other samples, it will likely be weeks before results are announced.

The process of drilling and collecting the results was delayed by several glitches that required study and work-arounds. One involved drill software and the other involved a test-bed problem with a sieve that is part of the process of delivering samples to the instruments.

Lead systems engineer Daniel Limonadi said that while there was no indication the sieve on Mars was malfunctioning, they had become more conservative in its use because of the test bed results. (Related: "A 2020 Rover Return to Mars?")

Author of the National Geographic e-book Mars Landing 2012, Marc Kaufman has been a journalist for more than 35 years, including the past 12 as a science and space writer, foreign correspondent, and editor for the Washington Post. He is also author of First Contact: Scientific Breakthroughs in the Hunt for Life Beyond Earth, published in 2011, and has spoken extensively to crowds across the United States and abroad about astrobiology. He lives outside Washington, D.C., with his wife, Lynn Litterine.

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Arias Leaves Stand After Describing Killing, Her Lies

Jodi Arias stepped down from the witness stand today after mounting an emotional effort to save herself from death row, insisting to the Arizona jury that an explosive fight with ex-boyfriend Travis Alexander led to his death, and that her lies about killing him masked deep regret and plans to commit suicide.

Arias, 32, will now face what is expected to be a withering cross-examination beginning Thursday from prosecutor Juan Martinez, who has been aggressive to many witnesses throughout the trial and who is expected to go after Arias' claim that she was forced to kill Alexander or be killed herself.

She is charged with murder for her ex-boyfriend's death and could face the death penalty if convicted.

Catching Up on the Trial? Check Out ABC News' Jodi Arias Trial Coverage

The day's dramatic testimony started with Arias describing the beginning of the fight on June 4, 2008 when she and Alexander were taking nude photos in his shower and she claims she accidentally dropped his new camera, causing Alexander to lose his temper. Enraged, he picked her up and body slammed her onto the tile floor, screaming at her, she told the jury.

Arias said she ran to his closet to get away from him, but could hear Alexander's footsteps coming after her down the hall. She grabbed a gun from his shelf and tried to keep running, but Alexander came after her, she said.

"I pointed it at him with both of my hands. I thought that would stop him, but he just kept running. He got like a linebacker. He got low and grabbed my waist, and as he was lunging at me the gun went off. I didn't mean to shoot. I didn't even think I was holding the trigger," she said.

"But he lunged at me and we fell really hard toward the tile wall, so at this point I didn't even know if he had been shot. I didn't see anything different. We were struggling, wrestling, he's a wrestler.

"So he's grabbing at my clothes and I got up, and he's screaming angry, and after I broke away from him. He said 'f***ing kill you bitch,'" she testified.

Asked by her lawyer whether she was convinced Alexander intended to kill her, Arias answered, "For sure. He'd almost killed me once before and now he's saying he was going to." Arias had earlier testified that Alexander had once choked her.

Timeline of the Jodi Arias Trial

Arias on Ex-Boyfriend's Death: 'I Don't Remember' Watch Video

Jodi Arias Describes Violent Sex Before Shooting Watch Video

Jodi Arias Testifies Ex Assaulted Her, Broke Her Fingers Watch Video

But Arias' story of the death struggle ended there as she told the court that she has no memory of stabbing or slashing Alexander whose body was later found with 27 stab wounds, a slit throat and two bullets in his head. She said she only remembered standing in the bathroom, dropping the knife on the tile floor, realizing the "horror" of what had happened, and screaming.

"I have no memory of stabbing him," she said. "There's a huge gap. I don't know if I blacked out or what, but there's a huge gap. The most clear memory I have after that point is driving in the desert."

Arias said that she decided in the desert not to admit to killing Alexander, a decision that would last for two years as Arias lied to friends, family, investigators and reporters about what really happened in Alexander's bathroom.

During that time she initially claimed she got lost that night while driving to a friend's house and never went to Alexander's home in Mesa,Ariz. She later changed her story and said two masked people, a man and a woman, burst into the home and killed Alexander and threatened to kill her family if she told anyone what happened.

She eventually confessed to killing her ex-boyfriend, but insisted it was self defense.

"The main reason (for lying) is because I was very ashamed of what happened. It's not something I ever imagined doing. It's not the kind of person I was. It was just shameful," she said. "I was also very scared of what might happen. I didn't want my family to know that I had done that, and I just couldn't bring myself to say that I did that."

"From day one there was a part of me that always wanted to (tell the truth) but didn't dare do that. I would rather have gone to my grave than admit I had done something like that," she said.

Arias said that she continued to lie because she figured she would never get caught; she was planning to kill herself before trial.

"I was concerned with how it would affect my family. I wanted to die. I was going to definitely kill myself," she said. "That was my plan. You can purchase different things in jail and I bought a bunch of Advil... and took it all in the next few days so it was in my system. They have razors for shaving, so I got one and took it apart one night with intentions to slit my wrists."

Arias said she balked at slitting her wrists after accidentally cutting herself, but that she still planned to commit suicide sometime in the future. When she told news reporters that "no jury would convict her," she claims she said it believing that she would be dead before they'd have a chance to put her on trial, Arias testified.

Arias said support from the public and her family eventually led her to change her mind.

"My family remained very supportive, and told me 'it doesn't matter what happens, we love you anyway.' I realized even if I told the truth they would still be there and wouldn't walk away," she testified.

"By the time spring, 2010, rolled around, I confessed. I basically told everyone what I could remember of the day and that the intruder story was all BS pretty much."

She said that her testimony today, a third version of events, was the truth.

Arias was arrested a month after Alexander's death, and prosecutors have argued that her behavior during those weeks showed a lack of remorse for the killing and an attempt to get away with murder.

Arias said today that after she killed Alexander and drove away from his Mesa, Ariz., home in a panic, it dawned on her that police would soon be looking for Alexander's killer, and she decided that she would pretend the bloody confrontation had never happened.

"I knew that it was really bad, that my life was probably done now. I wished it was just a nightmare I could wake up from, but I knew I had messed up pretty badly and the inevitable was going to be something I could not really run from," she testified.

"I didn't want anyone to know that that had happened or that I did it, so I started taking steps in the aftermath to cover it up. I did a whole bunch of things to try to make it seem like I was never there," she said.

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Today on New Scientist: 19 February 2013

Doctors would tax sugary drinks to combat obesity

Hiking the price of fizzy drinks would cut consumption and so help fight obesity, urges the British Academy of Medical Royal Colleges

Space station's dark matter hunter coy about findings

Researchers on the Alpha Magnetic Spectrometer, which sits above the International Space Station, have collected their first results - but won't reveal them for two weeks

Huge telescopes could spy alien oxygen

Hunting for oxygen in the atmospheres of distant exoplanets is a tough job, but a new wave of giant telescopes should be up to the task

Evolution's detectives: Closing in on missing links

Technology is taking the guesswork out of finding evolution's turning points, from the first fish with legs to our own recent forebears, says Jeff Hecht

Moody Mercury shows its hidden colours

False-colour pictures let us see the chemical and physical landscape of the normally beige planet closest to the sun

LHC shuts down to prepare for peak energy in 2015

Over the next two years, engineers will be giving the Large Hadron Collider the makeover it needs to reach its maximum design energy

Insert real news events into your mobile game

From meteor airbursts to footballing fracas, mobile games could soon be brimming with news events that lend them more currency

3D-printing pen turns doodles into sculptures

The 3Doodle, which launched on Kickstarter today, lets users draw 3D structures in the air which solidify almost instantly

We need to rethink how we name exoplanets

Fed up with dull names for exoplanets, Alan Stern and his company Uwingu have asked the public for help. Will it be so long 2M 0746+20b, hello Obama?

A shocking cure: Plug in for the ultimate recharge

An electrical cure for ageing attracted the ire of the medical establishment. But could the jazz-age inventor have stumbled upon a genuine therapy?

Biofuel rush is wiping out unique American grasslands

Planting more crops to meet the biofuel demand is destroying grasslands and pastures in the central US, threatening wildlife

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Pistorius "fought non-stop" with girlfriend on night of killing

PRETORIA: "Blade Runner" Oscar Pistorius returned to court Wednesday to hear explosive allegations that he fought "non-stop" with his slain girlfriend Reeva Steenkamp on the night of her killing.

With the South African sporting hero already facing a tough fight to win bail, the prosecution presented police evidence to flesh out the charge he deliberately murdered the cover girl on Valentine's Day.

Police investigator Hilton Botha told the court that an unnamed witness "heard talking that sounded like non-stop fighting from two to three in the morning" shortly before Steenkamp was found dead at Pistorius' Pretoria home last Thursday.

Botha also said 29-year-old Steenkamp was shot three times through the bathroom door, with wounds to her head, elbow and hip.

Botha said the shots were not fired straight at the toilet door, but rather "directly to the toilet, the basin itself."

"If you walk in directly and fire straight at the door you will miss the toilet," he said, suggesting Pistorius had been aiming.

Steenkamp, who had been going out with Pistorius since late last year, was declared dead shortly before 4:15am on February 14 by medics and was found covered in towels and wearing white shorts and a black vest.

Botha also said 26-year-old Pistorius would face an additional charge of possessing unlicensed .38 special calibre ammunition.

At Tuesday's hearing, the Olympic and Paralympic track star had tearfully denied premeditated murder, a charge that risks a life sentence.

Pistorius told the court he shot at Steenkamp through a locked bathroom door, mistakenly believing she was a burglar. "I had no intention to kill my girlfriend," he said.

With only the suspect and the victim in the house at the time of the killing, the state's case is expected to focus heavily on forensic evidence and witnesses who are alleged to have heard the couple argue.

Prosecutor Gerrie Nel had argued on Tuesday that Pistorius deliberately fired four shots into the bathroom door after putting on his prosthetic legs, hitting a terrified Steenkamp three times and fatally wounding her.

"She could go nowhere," Nel said. "She locked the door for a purpose."

On Tuesday, the double amputee track star broke down in tears repeatedly as his own words from his own affidavit filled the court: "We were deeply in love and couldn't be more happy.

"I am absolutely mortified by the events and the devastating loss of my beloved Reeva," he said in his first public comments on the killing.

As the court hearing proceeded on Tuesday, Steenkamp was laid to rest at an emotional private ceremony at a crematorium in her hometown of Port Elizabeth.

Pistorius was an inspiration to millions when he became the first double amputee to compete against able-bodied athletes in the Olympics in London last year.

Pistorius said he had awoken in the dead of night when he heard a noise at his upscale home in a gated Pretoria estate

"Filled with horror and fear" that someone was in the bathroom, he said he felt "very vulnerable" because he did not have his prosthetic legs on.

He said he fired shots at the toilet door and shouted to his girlfriend to phone the police, but then realised it could have been Steenkamp in the bathroom.

After smashing the door with a cricket bat, Pistorius said "Reeva was slumped over but alive".

He said he kept a firearm under his bed at night because he had been a victim of violence and burglaries before and had received death threats.

Magistrate Desmond Nair said he could not rule out that there was some planning involved in the killing, which may be considered as a premeditated murder, setting a high bar for bail.

Pistorius, who off the track has had a rocky private life with stories of rash behaviour, beautiful women, guns and fast cars, has built up a powerful team of lawyers, medical specialists and public relations experts for his defence.

In 2009, Pistorius -- who once admitted to a newspaper that he slept with a pistol, machine gun, cricket bat and baseball bat for fear of burglars -- spent a night in jail after allegedly assaulting a 19-year-old woman at a party.

The Paralympian gold medallist became the first double amputee to run against able-bodied athletes at last year's Olympics in London on the carbon-fibre running blades that inspired his nickname.

But his career has been put on hold since the shooting, forcing him to cancel races in Australia, Brazil, Britain and the United States between March and May.

Pistorius revealed he earned 5.6 million rand ($640,000) a year and owned the $570,000 house where the killing took place as well as two other homes.

But two of his American sponsors, Nike and sunglasses maker Oakley, announced they were dropping Pistorius from their advertising campaigns, which have earned him millions of dollars in endorsements.

- AFP/al

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Google debuts event page for Academy Awards ceremony

Google's Academy Awards destination page.

(Credit:
Screenshot by Steven Musil/CNET)

Google is rolling out the red carpet for the Academy Awards with a destination site that promises to help users "get more from the Oscars."

In a partnership with Oscars organizers, the Web giant has created a resource page to keep movie fans engaged and informed in the days leading up to the awards ceremony on Sunday. While Google has created event-specific sites before, such as its election hub last year, this is the first time it has focused on the Oscars.

In honor of its Oscars debut, Google is making sure it gets as many of its own products play supporting roles, including YouTube, Google Play, Knowledge Graph, Maps and even Google+ Hangouts.

In addition to the standard list of nominees for every category, the page includes projections on who the winner will be based on the search popularity of nominees. A YouTube video takes users through a visual rewind of 2012 on the silver screen (see below), while Google Play offers a chance to catch up with some of movies and other related media, including an app offering nominee information and movie trailers.

Need information on how to dress for the red carpet, an Oscars ballot, or real-time mobile information on the awards? Google promises to deliver the best performance in those roles as well.

However, some features didn't seem ready for their close-up. A map purporting to hold information about actor birthplaces and movie filming locations didn't seem to be functioning, while another map of the ceremony location was said to be "coming soon."

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Florida Python Hunt Captures 68 Invasive Snakes

It's a wrap—the 2013 Python Challenge has nabbed 68 invasive Burmese pythons in Florida, organizers say. And experts are surprised so many of the elusive giants were caught.

Nearly 1,600 people from 38 states—most of them inexperienced hunters—registered for the chance to track down one of the animals, many of which descend from snakes that either escaped or were dumped into the wild.

Since being introduced, these Asian behemoths have flourished in Florida's swamps while also squeezing out local populations of the state's native mammals, especially in the Everglades. (See Everglades pictures.)

To highlight the python problem, the Florida Fish and Wildlife Conservation Commission and its partners launched the 2013 Python Challenge, which encouraged registered participants to catch as many pythons as they could between January 12 and February 10 in state wildlife-management areas within the Everglades.

The commission gave cash prizes to those who harvested the most and longest pythons.

Frank Mazzotti, a wildlife ecologist at the University of Florida and scientific leader for the challenge, said before the hunt that he would consider a harvest of 70 animals a success—and 68 is close enough to say the event met its goals.

It's unknown just how many Burmese pythons live in Florida, but catching 68 snakes is an "exceptional" number, added Kenneth Krysko, senior herpetologist at the Florida Museum of Natural History in Gainesville.

Snakes in the Grass

Finding 68 snakes is impressive, experts say, since it's so hard to find pythons. For one, it's been unusually warm lately in Florida, which means the reptiles—which normally sun themselves to regulate their body temperature—are staying in the brush, making them harder to detect, Krysko said.

On top of that, Burmese pythons are notoriously hard to locate, experts say.

The animals are so well camouflaged that people can stand right next to one and not notice it. "It's rare that you get to see them stretched out—most of the time they're blending in," said Cheryl Millett, a biologist at the Nature Conservancy, a Python Challenge partner.

What's more, the reptiles are ambush hunters, which means they spend much of their time lying in wait in dense vegetation, not moving, she said.

That's why Millett gave the hunters some tips, such as looking along the water's edge, where the snakes like to hang out, and also simply listening for "something big moving through the vegetation."

Even so, catching 68 snakes is "actually is a little more than I expected," said Millett.

No Walk in the Park

Ruben Ramirez, founder of the company Florida Python Hunters, won two prizes in the competition: First place for the most snakes captured—18—and second place for the largest python, which he said was close to 11 feet (3.4 meters) long. The biggest Burmese python caught in Florida, nabbed in 2012, measured 17.7 feet (5.4 meters).

"They're there, but they're not as easy to find as people think," said Ramirez. "You're not going to be stumbling over pythons in Miami." (Related blog post: "What It's Like to Be a Florida Python Hunter.")

All participants, some of whom had never hunted a python before, were trained to identify the difference between a Burmese python and Florida's native snakes, said Millett. No native snakes were accidentally killed, she said.

Hunters were also told to kill the snakes by either putting a bolt or a bullet through their heads, or decapitating them-all humane methods that result "in immediate loss of consciousness and destruction of the brain," according to the Python Challenge website.

Ramirez added that some of the first-time or amateur hunters had different expectations. "I think they were expecting to walk down a canal and see a 10-foot [3-meter], 15-foot [4.5-meter] Burmese python. They thought it'd be a walk in the park."

Stopping the Spread

Completely removing these snakes from the wild isn't easy, and some scientists see the Python Challenge as helping to achieve part of that goal. (Read an opposing view on the Python Challenge: "Opinion: Florida's Great Snake Hunt Is a Cheap Stunt.")

"You're talking about 68 more animals removed from the population that shouldn't be there—that's 68 more mouths that aren't being fed," said the Florida museum's Krysko. (Read about giant Burmese python meals that went bust.)

"I support any kind of event or program that not only informs the general public about introduced species, but also gets the public involved in removing these nonnative animals that don't belong there."

The Nature Conservancy's Millett said the challenge had two positive outcomes: boosting knowledge for both science and the public.

People who didn't want to hunt or touch the snakes could still help, she said, by reporting sightings of exotic species to 888-IVE-GOT-1, through free IveGot1 apps, or www.ivegot1.org.

Millett runs a public-private Nature Conservancy partnership called Python Patrol that the Florida wildlife commission will take on in the fall. The program focuses not only on eradicating invasive pythons but on preventing the snake from moving to ecologically sensitive areas, such as Key West.

Necropsies on the captured snakes will reveal what pythons are eating, and location data from the hunters will help scientists figure out where the snakes are living—valuable data for researchers working to stop their spread.

"This is the most [number of] pythons that have been caught in this short of a period of time in such an extensive area," said the University of Florida's Mazzotti.

"It's an unprecedented sample, and we're going to get a lot of information out of that."

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