Why We Walk … and Run … And Walk Again to Get Where We're Going

You have to get to a bus stop to catch the once-an-hour express ... or to a restaurant to meet a friend ... or to a doctor's office. You've got maybe a half a mile to cover and you're worried you'll be late. You run, then you stop and walk, then run some more.

But wait. Wouldn't it be better to run the whole way?

Not necessarily.

A new study by an assistant professor of mechanical engineering at Ohio State University tests the theory that people subconsciously mix walking and running so they get where they need to. The idea is that "people move in a manner that minimizes energy consumption," said the professor, Manoj Srinivasan.

Srinivasan asked 36 subjects to cover 400 feet (122 meters), a bit more than the length of a football field. He gave them a time to arrive at the finish line and a stopwatch. If the deadline was supertight, they ran. If they had two minutes, they walked. And if the deadline was neither too short nor too far off, they toggled between walking and running.

The takeaway: Humans successfully make the walk-run adjustment as they go along, based on their sense of how far they have to go. "It's not like they decide beforehand," Srinivasan said. (Get tips, gear recommendations, and more in our Running Guide.)

The Best Technique for "the Twilight Zone"

"The mixture of walking and running is good when you have an intermediate amount of time," he explained. "I like to call it 'the Twilight Zone,' where you have neither infinite time nor do you have to be there now."

That ability to shift modes served ancient humans well. "It's basically an evolutionary argument," Srinivasan said. A prehistoric human seeking food would want to move in a way that conserves some energy so that if food is hard to find, the hunter won't run out of gas—and will still be able to rev it up to escape predators.

The study, published on January 30 in the Journal of the Royal Society Interface, doesn't answer that question of how we make such adjustments.

Runners: Take a Break if You Need It

The mix of walking and running is also something that nonelite marathoners are familiar with. Covering 26.2 miles might take less of a toll if the runner stops running from time to time, walks a bit, then resumes a jogging pace. "You use less energy overall and also give yourself a bit of a break," Srinivasan noted. (Watch: An elite marathoner on her passion for running.)

One take-home lesson is: Runners, don't push it all the time. A walk-run mix will minimize the energy you expend.

Lesson two: If you're a parent walking with your kid, and the kid lags behind, then runs to catch up, then lags again, the child isn't necessarily trying to annoy you. Rather, the child is perhaps exhibiting an innate ability to do the walk-run transition.

Potential lesson three: The knowledge that humans naturally move in a manner that minimizes energy consumption might be helpful in designing artificial limbs that feel more natural and will help the user reduce energy consumption.

The big question for Manoj Srinivasan: Now that he has his walk-run theory, does he consciously switch between running and walking when he's trying to get somewhere? "I must admit, no," he said. "When I want to get somewhere, I just let the body do its thing." But if he's in a rush, he'll make a mad dash.

"Talk to you tomorrow," he signed off in an email to National Geographic News. "Running to get to teaching now!"

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Nightmare Ends: Passengers Leave Disabled Ship

After five days without power in the Gulf of Mexico, the more than 4, 000 people aboard the Carnival Triumph returned home to the U.S., with many of them telling their horror stories for the first time.

Passengers began to disembark the damaged ship around 10:15 p.m. CT Thursday in Mobile, Ala. The last passenger disembarked the ship at 1 a.m. local time, according to Carnival's Twitter handle.

Passenger Brandi Dorsett was thankful to be home, especially for her mother who was with her on the ship. Dorsett said she wasn't pleased with the doctor on staff.

"My mother is a diabetic and they would not even come to the room because she cannot walk the stairs to help her with insulin. She hasn't had insulin in three days," Dorsett said.

The Carnival Triumph departed Galveston, Texas, last Thursday and lost power Sunday after a fire in the engine room disabled the vessel's propulsion system and knocked out most of its power.

After power went out, passengers texted ABC News that sewage was seeping down the walls from burst plumbing pipes, carpets were wet with urine, and food was in short supply. Reports surfaced of elderly passengers running out of critical heart medicine and others on board squabbling over scarce food.

"It's degrading. Demoralizing and then they want to insult us by giving us $500," Veronica Arriaga said after disembarking the ship.

Passengers were already being given a full refund for the cruise, transportation expenses and vouchers for another cruise. Carnival Cruise Lines is now boosting that offer to include another $500 per person.

As the ship docked, passengers lined the decks of the Triumph, waving and whistling to those on shore. "Happy V-Day" read a homemade sign made for the Valentine's Day arrival and another, more starkly: "The ship's afloat, so is the sewage."

Some still aboard chanted, "Let me off, let me off!" and "Sweet Home Alabama."

AP Photo/John David Mercer

Girl Disembarks Cruise Ship, Kisses the Ground Watch Video

Carnival CEO Gerry Cahill: 'I Want to Apologize' Watch Video

Carnival Cruise Ship Passengers Line Up for Food Watch Video

Click Here for Photos of the Stranded Ship at Sea

Kendall Jenkins was one of many passengers that were photographed kissing the ground when they exited the ship. Jenkins, like many passengers, created makeshift beds out of lounge chairs on the ship's deck after the raw sewage smell became too much to contend with.

"We kind of camped out by our lifeboat. We would have nightmares about Titanic basically happening," passenger Kendall Jenkins told ABC News Radio.

"I am just so blessed to be back home," she added.

WATCH: Carnival CEO Gerry Cahill Apologizes to Passengers

Approximately 100 buses were waiting to take passengers on the next stage of their journey. Passengers had the option to take a bus ride to New Orleans or Galveston, Texas, where the ill-fated ship's voyage began. From there, passengers will take flights home, which Carnival said they would pay for.

Inside the buses, Carnival handed out bags of food that included French fries, chicken nuggets, honey mustard barbecue sauce and apples.

Deborah Knight, 56, decided to stay in Mobile after the arduous journey was over rather than board a bus for a long ride. Her husband Seth drove in from Houston and they checked in at a downtown Mobile hotel.

"I want a hot shower and a daggum Whataburger," said Knight.

She said she was afraid to eat the food on board and had gotten sick while on the ship.

Cruise Ship Newlyweds Won't Be Spending Honeymoon on a Boat

For 24-year-old Brittany Ferguson of Texas, not knowing how long passengers had to endure their time aboard was the worst part.

"I'm feeling awesome just to see land and buildings," Ferguson said, who was in a white robe given to her aboard. "The scariest part was just not knowing when we'd get back," she told The Associated Press.

Carnival president and CEO Gerry Cahill praised the ship's crew and told reporters that he was headed on board to apologize directly to its passengers shortly before the Carnival Triumph arrived in Mobile.

"I know the conditions on board were very poor," Cahill said Thursday night. "I know it was very difficult, and I want to apologize again for subjecting our guests for that. ... Clearly, we failed in this particular case."

Luckily no one was hurt in the fire they triggered the power outage, but many passengers aboard the 900 foot colossus said they smelled smoke and were living in fear.

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The computer that never crashes

A revolutionary new computer based on the apparent chaos of nature can reprogram itself if it finds a fault

OUT of chaos, comes order. A computer that mimics the apparent randomness found in nature can instantly recover from crashes by repairing corrupted data.

Dubbed a "systemic" computer, the self-repairing machine now operating at University College London (UCL) could keep mission-critical systems working. For instance, it could allow drones to reprogram themselves to cope with combat damage, or help create more realistic models of the human brain.

Everyday computers are ill suited to modelling natural processes such as how neurons work or how bees swarm. This is because they plod along sequentially, executing one instruction at a time. "Nature isn't like that," says UCL computer scientist Peter Bentley. "Its processes are distributed, decentralised and probabilistic. And they are fault tolerant, able to heal themselves. A computer should be able to do that."

Today's computers work steadily through a list of instructions: one is fetched from the memory and executed, then the result of the computation is stashed in memory. That is then repeated – all under the control of a sequential timer called a program counter. While the method is great for number-crunching, it doesn't lend itself to simultaneous operations. "Even when it feels like your computer is running all your software at the same time, it is just pretending to do that, flicking its attention very quickly between each program," Bentley says.

He and UCL's Christos Sakellariou have created a computer in which data is married up with instructions on what to do with it. For example, it links the temperature outside with what to do if it's too hot. It then divides the results up into pools of digital entities called "systems".

Each system has a memory containing context-sensitive data that means it can only interact with other, similar systems. Rather than using a program counter, the systems are executed at times chosen by a pseudorandom number generator, designed to mimic nature's randomness. The systems carry out their instructions simultaneously, with no one system taking precedence over the others, says Bentley. "The pool of systems interact in parallel, and randomly, and the result of a computation simply emerges from those interactions," he says.

It doesn't sound like it should work, but it does. Bentley will tell a conference on evolvable systems in Singapore in April that it works much faster than expected.

Crucially, the systemic computer contains multiple copies of its instructions distributed across its many systems, so if one system becomes corrupted the computer can access another clean copy to repair its own code. And unlike conventional operating systems that crash when they can't access a bit of memory, the systemic computer carries on regardless because each individual system carries its own memory.

The pair are now working on teaching the computer to rewrite its own code in response to changes in its environment, through machine learning.

"It's interesting work," says Steve Furber at the University of Manchester, UK, who is developing a billion-neuron, brain-like computer called Spinnaker (see "Build yourself a brain"). Indeed, he could even help out the UCL team. "Spinnaker would be a good programmable platform for modelling much larger-scale systemic computing systems," he says.

This article appeared in print under the headline "Machine, heal thyself"

Build yourself a brain

The systemic computer takes its lead from nature (see main story), but so does Spinnaker, an ambitious project at the University of Manchester, UK, to build a one-billion-neuron computer from microchips. The idea is to create a supercomputer that works just like the human brain using the same ARM chips that power most smartphones. The team wants to do parallel simulation of large-scale neural networks using the equivalent of 1 per cent of the human brain's neuron count. They are well on their way: using chips that model 1000 neurons each, their system has created the equivalent of 750,000 neurons. "We're advancing slowly but steadily," says project leader Steve Furber.

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French medical body for euthanasia in "exceptional" cases

PARIS: France's medical ethics council said Thursday that euthanasia should be allowed in exceptional cases and when suffering patients make "persistent and lucid requests."

Invoking a "duty to humanity," the body said that euthanasia should be reserved for "exceptional cases" like putting an end to "prolonged suffering", or "unbearable" pain.

President Francois Hollande had referred a report on allowing assisted suicide to the council to examine the precise circumstances under which such steps could be authorised with a view to producing draft legislation by June.

"The existing legislation does not meet the legitimate concerns expressed by people who are gravely and incurably ill," Hollande had said.

The report submitted to the council said physicians should be allowed to authorise interventions that ensure quicker deaths for terminal patients in three specific sets of circumstances.

In the first case, the patient involved would be capable of making an explicit request to that effect or have issued advance instructions in the event of him or her becoming incapable of expressing an opinion.

The second scenario envisages medical teams withdrawing treatment and/or nourishment on the basis of a request by the family of a dying patient who is no longer conscious and has not made any instructions.

The third would apply to cases where treatment is serving only to sustain life artificially.

-AFP/fl

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Researchers develop a more accurate car navigation system

Researchers say new navigation system can be installed on any vehicle, including a Volkswagen Touareg.

(Credit:
Josh Miller/CNET)

Driverless cars could get a big boost from a new system that researchers say will increase the accuracy of in-car satellite navigation systems by 90 percent.

Researchers say the system combines conventional GPS signals with data from sensors such as accelerometers and gyroscopes to determine a vehicle's position within six feet of its location, a dramatic reduction from the current margin of error of 50 feet. The system can be installed inexpensively in any vehicle, say researchers at Spain's Universidad Carlos III de Madrid, where the system was developed.

"We have managed to improve the determination of a vehicle's position in critical cases by between 50 and 90 percent, depending on the degree of the signals' degradation and the time that is affecting the degradation on the GPS receiver," David Martín, a researcher at the Systems Intelligence Laboratory, said in a statement describing the project.

The system aims to tackle the greatest challenge faced by conventional GPS systems in urban settings: loss or disruption of satellite signal due to interference created by buildings, trees, and tunnels. The new system uses contextual information and an algorithm that eliminates deviations caused by degradation or loss of signal from satellites.

The researchers have installed a prototype system on an "intelligent
car" with the goal of capturing and interpreting all the information available while driving a car. The team sees applications of the system in driverless car systems currently under development by Google and a handful of automakers.

"Future applications that will benefit from the technology that we are currently working on will include cooperative driving, automatic maneuvers for the safety of pedestrians, autonomous vehicles or cooperative collision warning systems," the team said.

Ultimately, the team hopes to develop a system that harnesses the sensors built in to smartphones, such an accelerometer, a gyroscope, a magnetometer, and GPS, as well as taking advantage of communications tools such as Wi-Fi, Bluetooth, and GSM.

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Are Honeybees Losing Their Way?

A single honeybee visits hundreds, sometimes thousands, of flowers a day in search of nectar and pollen. Then it must find its way back to the hive, navigating distances up to five miles (eight kilometers), and perform a "waggle dance" to tell the other bees where the flowers are.

A new study shows that long-term exposure to a combination of certain pesticides might impair the bee's ability to carry out its pollen mission.

"Any impairment in their ability to do this could have a strong effect on their survival," said Geraldine Wright, a neuroscientist at Newcastle University in England and co-author of a new study posted online February 7, 2013, in the Journal of Experimental Biology.

Wright's study adds to the growing body of research that shows that the honeybee's ability to thrive is being threatened. Scientists are still researching how pesticides may be contributing to colony collapse disorder (CCD), a rapid die-off seen in millions of honeybees throughout the world since 2006.

"Pesticides are very likely to be involved in CCD and also in the loss of other types of pollinators," Wright said. (See the diversity of pollinating creatures in a photo gallery from National Geographic magazine.)

Bees depend on what's called "scent memory" to find flowers teeming with nectar and pollen. Their ability to rapidly learn, remember, and communicate with each other has made them highly efficient foragers, using the waggle dance to educate others about the site of the food source.

Watch as National Geographic explains the waggle dance.

Their pollination of plants is responsible for the existence of nearly a third of the food we eat and has a similar impact on wildlife food supplies.

Previous studies have shown certain types of pesticides affect a bee's learning and memory. Wright's team wanted to investigate if the combination of different pesticides had an even greater effect on the learning and memory of honeybees.

"Honeybees learn to associate floral colors and scents with the quality of food rewards," Wright explained. "The pesticides affect the neurons involved in these behaviors. These [affected] bees are likely to have difficulty communicating with other members of the colony."

The experiment used a classic procedure with a daunting name: olfactory conditioning of the proboscis extension reflex. In layman's terms, the bee sticks out its tongue in response to odor and food rewards.

For the experiment, bees were collected from the colony entrance, placed in glass vials, and then transferred into plastic sandwich boxes. For three days the bees were fed a sucrose solution laced with sublethal doses of pesticides. The team measured short-term and long-term memory at 10-minute and 24-hour intervals respectively. (Watch of a video of a similar type of bee experiment.)

This study is the first to show that when pesticides are combined, the impact on bees is far worse than exposure to just one pesticide. "This is particularly important because one of the pesticides we used, coumaphos, is a 'medicine' used to treat Varroa mites [pests that have been implicated in CCD] in honeybee colonies throughout the world," Wright said.

The pesticide, in addition to killing the mites, might also be making honeybees more vulnerable to poisoning and effects from other pesticides.

Stephen Buchmann of the Pollinator Partnership, who was not part of Wright's study, underscored how critical pollinators are for the world. "The main threat to pollinators is habitat destruction and alteration. We're rapidly losing pollinator habitats, natural areas, and food—producing agricultural lands that are essential for our survival and well being. Along with habitat destruction, insecticides weaken pollinators and other beneficial insects."

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Dorner Not IDed, But Manhunt Considered Over

Though they have not yet identified burned remains found at the scene of Tuesday's fiery, armed standoff, San Bernardino, Calif., officials consider the manhunt over for Christopher Dorner, the fugitive ex-cop accused of going on a killing spree.

"The events that occurred yesterday in the Big Bear area brought to close an extensive manhunt," San Bernardino County Sheriff John McMahon told reporters this evening.

"I cannot absolutely, positively confirm it was him," he added.

However, he noted the physical description of the suspect authorities pursued to a cabin at the standoff scene, as well as the suspect's behavior during the chase and standoff, matched Dorner, 33.

The charred remains of the body believed to be Dorner were removed from the cabin high in the San Bernardino Mountains near Big Bear, Calif., the apparent site of Dorner's last stand. Cornered inside the mountain cabin Tuesday, the suspect shot at cops, killing one deputy and wounding another, before the building was consumed by flames.

"We did not intentionally burn down that cabin to get Mr. Dorner out," McMahon said tonight, though he noted pyrotechnic canisters known as "burners" were fired into the cabin during a tear gas assault in an effort to flush out Dorner. The canisters generate high temperatures, he added.

The deputies wounded in the firefight were airlifted to a nearby hospital, where one died, police said.

Christopher Dorner Believed Dead After Shootout with Police Watch Video

Carjacking Victim Says Christopher Dorner Was Dressed for Damage Watch Video

Christopher Dorner Manhunt: Inside the Shootout Watch Video

The deceased deputy was identified tonight as Det. Jeremiah MacKay, 35, a 15-year veteran and the father of two children -- a daughter, 7, and son, 4 months old.

"Our department is grieving from this event," McMahon said. "It is a terrible deal for all of us."

The Associated Press quoted MacKay on the Dorner dragnet Tuesday, noting that he had been on patrol since 5 a.m. Saturday.

"This one you just never know if the guy's going to pop out, or where he's going to pop out," MacKay said. "We're hoping this comes to a close without more casualties. The best thing would be for him to give up."

The wounded deputy, identified as Alex Collins, was undergoing multiple surgeries for his wounds at a hospital, McMahon said, but was expected to make a full recovery.

Before the final standoff, Dorner was apparently holed up in a snow-covered cabin in the California mountains just steps from where police had set up a command post and held press conferences during a five-day manhunt.

The manhunt for Dorner, one of the biggest in recent memory, led police to follow clues across the West and into Mexico, but it ended just miles from where Dorner's trail went cold last week.

Residents of the area were relieved today that after a week of heightened police presence and fear that Dorner was likely dead.

"I'm glad no one else can get hurt and they caught him. I'm happy they caught the bad guy," said Ashley King, a waitress in the nearby town of Angelus Oaks, Calif.

Hundreds of cops scoured the mountains near Big Bear, a resort area in Southern California, since last Thursday using bloodhounds and thermal-imaging technology mounted to helicopters, in the search for Dorner. The former police officer and Navy marksman was suspected to be the person who killed a cop and cop's daughter and issued a "manifesto" declaring he was bent on revenge and pledging to kill dozens of LAPD cops and their family members.

But it now appears that Dorner never left the area, and may have hid out in an unoccupied cabin just steps from where cops had set up a command center.

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Obama keeps faith in science and warns of cyber threats

Peter Aldhous, San Francisco bureau chief

"IT IS our unfinished task to restore the basic bargain that built this country - the idea that if you work hard and meet your responsibilities, you can get ahead."

In adopting the phrase "unfinished task" as a signature motif for his 2013 State of the Union address, President Barack Obama signalled a return to familiar themes. For those who care about investment in science, that was a reassuring message. 

The fight against global warming and the importance of technology to protect national security also got high billing. On the latter, Obama signaled that hacking skills, rather than kilotons, are increasingly a crucial currency, promising a new focus on combating cyberattacks - paralleled by negotiated cuts to the US nuclear arsenal. 

In a combative speech designed to counter Republican opponents who want to cut the budget deficit by curbing spending on Obama's priorities - including education and research - the President made the case for continued investment in innovation.

"Every dollar we invested to map the human genome returned $140 to our economy. Today, our scientists are mapping the human brain to unlock the answers to Alzheimer's; developing drugs to regenerate damaged organs; devising new material to make batteries ten times more powerful. Now is not the time to gut these job-creating investments in science and innovation. Now is the time to reach a level of research and development not seen since the height of the Space Race."

The estimate of a 140:1 return on investment in genomics comes from a 2011 study by the Battelle Memorial Institute in Columbus, Ohio. While the precise numbers from that analysis have been questioned, the importance of continued innovation to America's future economic competitiveness has been stressed in multiple reports, notably from the US National Academies. 

"Now our enemies are also seeking the ability to sabotage our power grid, our financial institutions, and our air traffic control systems. We cannot look back years from now and wonder why we did nothing in the face of real threats to our security and our economy."

Obama called on Congress to pass new legislation to counter threats from hackers backed by hostile governments. That won't be easy: last year, a bill that would have demanded that companies meet minimum standards for cybersecurity, and report if they are attacked, foundered amid complaints that it would impose large costs on US businesses. 

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Pope makes first appearance since shock resignation

VATICAN CITY: Pope Benedict XVI made his first public appearance Wednesday since the shock announcement of his resignation, sticking with his schedule by presiding over his weekly general audience.

Tickets to the event in the Vatican's Paul VI auditorium were issued well in advance, so several thousand pilgrims experienced the historic moment out of sheer luck just two days after the 85-year-old Benedict said he would step down at the end of the month.

The pope will then celebrate Ash Wednesday mass at 1600 GMT, his last public mass and one of his final engagements as pontiff.

The mass is traditionally held in the Santa Sabina Church on Rome's Aventine Hill, but has been moved to St Peter's Basilica out of respect for the outgoing pontiff and to accommodate the crowd of faithful who will want to mark the end of his eight-year rule -- one of the shortest in the Church's modern history.

"It will be an important concelebration, and the last led by the Holy Father in Saint Peter's," Vatican spokesman Federico Lombardi said.

The high point of Wednesday's mass, which launches the traditional period of penitence ahead of Easter in the Christian calendar, will see the pope mark the foreheads of the faithful with ashes.

Lombardi has said he expects a new pope in place in time for Easter, which falls on March 31 this year, although no date has yet been set for the secret conclave to elect a new leader of the world's 1.2 billion Catholics.

In the meantime, the outgoing pontiff will honour his existing engagements.

On Thursday he will hold his annual meeting with the pastors of Rome. And before he steps down at the end of the month he will also meet the presidents of Guatemala and Romania, as scheduled.

Next week will be given over to a spiritual retreat at the Vatican which is sure to be dominated by jockeying among factions within the College of Cardinals over the choice of Benedict's successor.

Benedict's decision to step down -- making him the first pontiff in 700 years to resign simply because he cannot carry on -- sparked a flurry of rumours over his health, fed by revelations that he had had an operation to replace the batteries in his pacemaker three months ago.

Some observers saw Benedict's decision as a bid to avoid the fate of his predecessor John Paul II, whose drawn-out and debilitating illness was played out on the world's stage.

But Lombardi insisted: "The pope is well and his soul is serene.

"He did not resign the pontificate because he is ill but because of the fragility that comes with old age."

After Ash Wednesday Benedict will, on the next two Sundays, will recite the Angelus from his apartment window and hold his final general audience, this time in St. Peter's Square on February 27, before retiring to a little-known monastery within Vatican walls.

Soon a new pope will be installed in the papal apartments, with his predecessor just a stone's throw away.

But Benedict will spend his time in prayer rather than giving advice, the Vatican says.

As rumours fly over front-runners for St. Peter's chair, commentators have said age may be a key factor in selecting a new pope, although any of the 117 cardinals eligible to vote is likely to be chosen.

While some hope Africa or Asia could yield the next pontiff, others have tipped high-flying European or North American cardinals. The new pope will have to face up to the growing secularism in the West, one of the Church's biggest challenges.

Only one other pope has resigned because of an inability to carry on -- Celestine V in 1294 -- a humble hermit who stepped down after just a few months saying he could no longer bear the intrigue of Rome.

-AFP/fl

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Opera embraces WebKit in browser brain transplant

Opera CTO Håkon Wium Lie

(Credit:
Stephen Shankland/CNET)

Opera Software, an independent voice in the browser market since the 1990s, will dramatically change its strategy by instead adopting the WebKit browser engine used by Safari and Chrome.

The Norwegian company announced the move today and said it will show off the first fruits of the work with a WebKit-based version of its
Android browser at the Mobile World Congress show in less than two weeks. But the company will move to WebKit for its desktop browser, too.

A browser engine processes the Web page instructions written in HTML, JavaScript, and CSS then renders the results on screens. The engine also interactions that are increasingly important as the developer world expands from static Web pages to dynamic Web apps.

Opera Chief Technology Officer Håkon Wium Lie described the company's motives in a statement:

The WebKit engine is already very good, and we aim to take part in making it even better. It supports the standards we care about, and it has the performance we need. It makes more sense to have our experts working with the open source communities to further improve WebKit and Chromium, rather than developing our own rendering engine further. Opera will contribute to the WebKit and Chromium projects, and we have already submitted our first set of patches: to improve multi-column layout.

Hints of Opera's WebKit work emerged with a mobile-browser project called ICE in January, but today's news is a much more sweeping change than just a single product. Opera said it will move gradually to the WebKit for "most of its upcoming versions of browsers for smartphones and computers." It's not immediately clear which products will continue to use Opera's in-house technology, and Opera declined to say which.

Opera has struggled to keep its fifth-place ranking in the browser usage, but it's certainly not irrelevant. The company also announced today that 300 million people use its browsers each month.

But there are difficult trends the company must face. On mobile devices, Opera Mini is a strong contender, but its popularity is chiefly on lower-end phones; iOS and Android devices come with their own WebKit-based browsers. On personal computers, Google's Chrome rose from nowhere in a few years, quickly surpassing Opera and
Safari, while Microsoft by some measures has reversed declines in its share of browser usage.

Although ditching its in-house Presto browser engine raises the possibility of engineering layoffs, Opera spokeswoman Zara Lauder took an optimistic tone when asked about it.

"We have never had more people at Opera working on our products than right now, and we look forward to contributing to WebKit," Lauder said. "This change has been some time in the making, and all hands are now hard at work on making the best possible browser for our users."

Although Opera's profile is lower than that of many rivals, it's still functioning financially. During the company's third quarter of 2012, the most recent for which financial results are available, Opera reported revenue grew 40 percent to $56 million, and its profit was $6.5 million. Its revenue sources include payments from search traffic it drives to partners including Google and Yandex, its own advertising technology, and partnerships with mobile network operators.

The WebKit project began as the KHTML engine used in the KDE project to supply Linux with a polished user interface and a host of software utilities, but Apple became its chief sponsor when it based OS X's WebKit on the project. WebKit got another major boost with Google's embrace.

Adobe Systems now is also contributing as it moves to recreate many of Flash Player's abilities without requiring the browser plug-in, and WebKit also is used in the browsers of BlackBerry OS and Samsung's Bada.

One notable consequence of moving to WebKit is that Opera will be able to more easily support the large and growing number of iOS devices. Apple rules prohibit browser engines besides a version of WebKit that Apple itself supplies (and incidentally, that runs slower than the version Safari on iOS itself uses). Google's Chrome for iOS uses this Apple-supplied version of WebKit, and Opera would be able to make such a move more easily if its own browser used WebKit, too.

WebKit is not a single, unified project, though. For example, Chrome and Safari differ dramatically under the covers in how they execute the JavaScript programs on Web pages. Chrome uses Google's V8 JavaScript engine, whereas Safari uses a different one called Nitro. Opera said it will use V8.

Another consequence of Opera's change is that developers could have an easier time supporting browsers. Although independent testing will still be required, Web pages likely will be easier to write and test -- especially advanced ones using newer features such as animations and "responsive" design that can handle a wide variety of screen types.

With Opera throwing in the towel on its own Presto engine technology, the bulk of the browser market will be reduced to using three primary engines: WebKit, Microsoft's Trident, and Mozilla's Gecko.

Lie also announced Opera's move on the WebKit mailing list.

"Switching from Presto to WebKit frees up resources and allows us to contribute to the WebKit platform," Lie said.

Being part of WebKit potentially gives Opera more clout in the standards world, because it can build experiments that are more easily tested and adopted by fellow WebKit members. That, in turn, makes it easier to formalize new ideas into actual standards.

Opera has begun work on first such standard through WebKit, an approach at Web page layouts that handle multiple columns of text and graphics more easily. Opera has begun submitting patches for the multicolumn layout idea.

"We have experimented with combining multicol layout with page floats and column spans; in 10 lines of CSS code one can create amazingly beautiful, scalable, and responsive paged
presentations," Lie said.

Opera's move from Presto to WebKit arguably give the company a lot more engineering breathing room, since it can share labor with other browser makers instead of pulling all its own weight. But not everybody was happy to hear the news.

"Sad day for my former team at Opera and for the Web to lose a rendering engine," tweeted Anne van Kesteren, who for years worked on standards issues at Opera.

Updated at 12:53 a.m. PT and 1:37 a.m. PT
with further details and comment from Opera.

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