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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Postmaster takes case for five-day mail delivery to skeptical senators

Postmaster General Patrick R. Donahoe took his controversial plan for five-day mail delivery before a congressional hearing Wednesday, where he told senators that the Postal Service “needs your help.”

Donahoe’s refrain was familiar.

●The U.S. Postal Service (USPS) is losing $25 million a day.

●Last year, the Postal Service lost $15.9 billion.

●It defaulted on $11.1 billion owed to the Treasury.

As he has before, Donahoe pleaded with Congress, this time the Senate Homeland Security and Governmental Affairs Committee, to approve comprehensive postal reform legislation. Now, more than before, it looks as though Congress will do so.

Rep. Elijah E. Cummings (Md.), the ranking Democrat on the House Committee on Oversight and Government Reform, told the Senate panel that after two months of negotiations, “we are close, very close” to agreement on a bipartisan, bicameral bill.

Without some assistance from Congress, said Sen. Tom Carper (D-Del.), chairman of the Senate committee, “the Postal Service will drift toward insolvency and, eventually, the point at which it must shut its doors. . . . We have never been closer to losing the Postal Service.”

Although in some ways Donahoe’s appearance echoed his many other pleas for congressional action, this hearing drew a standing-room-only crowd on the third floor of the Dirksen Senate Office Building. That was probably influenced by all the attention generated by his surprise announcement last week that Saturday mail delivery will end in August.

Donahoe’s written testimony outlined several key legislative goals, but five-day mail delivery was not specifically listed among them. After repeatedly urging Congress to end the six-day requirement, Donahoe said postal officials had determined that he could take that action without congressional approval.

Moving to five-day delivery would close just 10 percent of the postal budget gap, Donahoe said, yet the controversy surrounding it stole the focus from other important financial issues.

Among them is a controversial proposal to move postal employees from the Federal Employees Health Benefits Program, which serves all federal workers, to a health insurance program run by the USPS.

Donahoe presented an updated health insurance proposal, but it received little attention compared with his five-day delivery plan.

Last year the Senate approved legislation, co-sponsored by Carper, that would allow five-day delivery two years after its enactment. The delay was designed to allow the Postal Service to study the impact of five-day delivery. Carper was among those who have expressed disappointment with Donahoe’s plan to implement it unilaterally.

“We are taking every reasonable and responsible step in our power to strengthen our finances immediately,” Donahoe told the committee. “We would urge Congress to eliminate any impediments to our new delivery schedule.

“Although discussion about our delivery schedule gets a lot of attention, it is just one important part of a larger strategy to close our budgetary gap,” he added. “It accounts for $2 billion in cost reductions while we are seeking to fill a $20 billion budget gap.”

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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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Talks on Rafale deal progressing well, PM says after meeting French president

NEW DELHI: After his meeting with French President Francois Hollande on Thursday, Prime Minister Manmohan Singh said that discussions for purchase of 126 Rafale fighter aircraft are "progressing well". India and France entered into exclusive negotiations for the purchase of medium multi role combat aircraft last year.

"Some progress has to be achieved and we hope we can reach a conclusion," said Hollande minutes after meeting Singh.

The two sides have been holding negotiations over issues related mostly to pricing. Both had announced weeks ahead of the visit that it may not be possible to conclude negotiations before the president's arrival in India.

The meeting also saw the two leaders reiterating commitment to building 6 European Pressurised Reactors at Jaitapur. Recalling the Memorandum of Understanding signed on 4 February 2009 between NPCIL and AREVA for setting up of 6 x 1650 MWe EPR units at Jaitapur, they reviewed the status in regard to the first two EPR units and noted that NPCIL and AREVA were engaged actively in techno-commercial discussions.

"They expressed hope for the expeditious conclusion of the negotiations. It was emphasized that the Nuclear Power Plant at Jaitapur would incorporate the highest safety standards," said a joint statement.

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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

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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 urges a move away from narrow focus on politics of austerity

Just about every argument in Washington since the 2010 midterm elections, which returned control of the House to Republicans, has centered on reducing the federal deficit. On Tuesday night, President Obama leaned into his second term by declaring that a single-minded focus on deficit reduction would jeopardize the nation’s future. And he sounded an urgent call to rebuild.

Reelected by an ascendent coalition, the president spoke from a position of strength in his fourth State of the Union address. The economy is improving. The Republican Party is in disarray. The time has come, Obama indicated, to pivot away from the politics of austerity.

“Most of us agree that a plan to reduce the deficit must be part of the agenda,” he said. “But let’s be clear: Deficit reduction alone is not an economic plan. A growing economy that creates good middle-class jobs — that must be the North Star that guides our efforts.”

The president rejected the fiscal brinkmanship that defined the past two years. Instead, he framed future fiscal debates as opportunities to shape a “smarter government” — one with new investments in science and innovation, with a rising minimum wage, with tax reform that eliminates loopholes and deductions for what the president labeled “the well-off and well-connected.”

Second-term presidents have a narrow window of time to enact significant change before they become lame ducks, and Obama, while echoing campaign themes of reinforcing the middle class, made an urgent case for a more pragmatic version of populism, one that emphasizes economic prosperity as the cornerstone of a fair society.

Over and over, he noted that the time to rebuild is now.

The “Fix-It-First” program that Obama outlined to put people to work on “urgent repairs,” such as structurally deficient bridges, bore echoes of President Bill Clinton’s call in his 1999 State of the Union address to “save Social Security first.” Clinton’s was an effective line, one that stopped — at least until President George W. Bush took office two years later — a Republican drive to use the budget surplus to cut taxes.

Although Obama’s speech lacked the conciliatory notes of some of his earlier State of the Union addresses, he did make overtures to Republicans and cited Mitt Romney, his presidential challenger, by name.

He combined tough talk about securing the border, which brought Republicans to their feet, with a pledge to entertain reasonable reforms to Medicare, the federal entitlement program that fellow Democrats are fighting to protect.

“Those of us who care deeply about programs like Medicare must embrace the need for modest reforms,” he said.

Obama also pledged to cut U.S. dependence on energy imports by expanding oil and gas development. And he singled out one area where he and Romney found agreement in last year’s campaign: linking increases in the minimum wage to the cost of living.

Obama set a bipartisan tone at the start of his speech, quoting from President John F. Kennedy’s address to Congress 51 years earlier when he said, “The Constitution makes us not rivals for power, but partners for progress.”

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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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Assam panchayat poll violence toll rises to 15

GOALPARA: The toll in Assam's Goalpara district rose to 15 with violence continuing night-long even as indefinite curfew continued in Krishnai and Mornoi areas today and the army flag-marching affected areas.

The toll in the police firing rose from 12 to 15 today, official sources said, without giving details.

Defence sources said the army was conducting flag marches and working in close coordination with the state government with additional columns kept on standby.

Miscreants fired injuring seven persons, including four seriously in Gobindapur Sala area under Goalpara police station area where ten houses were set ablaze while another five were torched at Rangagora and 20 at Paharsinghpara under Mornoi police station, police sources said.

Residents of three villages fled their homes and were sheltering in relief camps, they said.

Groups of people, including women, armed with lethal weapons attacked polling centres during the third and last phase of the panchayat elections on Tuesday.

Ministers Rockybul Hussain, Rajib Lochan Pegu with Agriculture Advisor to chief minister Bhumidhar Barman, were camping in the district.

The ethnic Rabhas and Hasongs supported by Bodo and Garo tribes have been demanding holding of the RHAC elections ahead of the grassroot polls claiming that panchayats would undermine the Council's authority.

Chief minister Tarun Gogoi has announced Rs five lakh for the next of kin of those killed in the police firing, Rs 50,000 for the injured and assistance for rebuilding houses torched.

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