Shell Oil Rig Runs Aground in Alaska

An enormous Shell Oil offshore drilling rig ran aground on an island in the Gulf of Alaska on Monday night after it broke free from tow ships in rough seas, officials said.

The rig, the Kulluk, which was used for test drilling in the Arctic last summer, is carrying about 139,000 gallons of diesel fuel and 12,000 gallons of lubricating oil and hydraulic fluid, the officials said.

A Coast Guard helicopter flew over the rig after the grounding at 8:48 p.m. and “detected no visible sheen,” said Darci Sinclair, a spokeswoman for a unified command of officials from Shell, Alaskan state agencies and other groups that has been directing the response since the troubles with the rig began last Thursday.

Ms. Sinclair said that more overflights were planned after daybreak on Tuesday, and that the unified command would be monitoring the fuel situation as it planned further actions. “The focus will be around salvage,” she said.

The 266-foot diameter rig ran aground on the east coast of Sitkalidak Island, an uninhabited island that is separated by the Sitkalidak Strait from the far larger Kodiak Island to the west. The nearest town, Old Harbor, is across the strait on Kodiak Island; it has a population of about 200 people.

Ms. Sinclair said the coast where the Kulluk ran aground has a combination of rocky and sandy terrain.

Earlier Monday, a Shell spokesman had said that the rig had been brought under control after towlines were reconnected to two ships during a break in what had been several days of extremely rough seas and high winds.

But late Monday afternoon the line from one of the ships, the Aiviq, became separated. Then several hours later, the other ship, the Alert, was ordered to disconnect its towline, out of concern for the safety of the ship’s nine-person crew. At the time, Ms. Sinclair said, swells were as high as 35 feet and winds were gusting up to 65 miles an hour.

The Kulluk, one of two rigs that Shell used to drill test wells off the North Slope of Alaska as part of the company’s ambitious and expensive effort to open Arctic waters to oil production, was being towed by the Aiviq to a Seattle shipyard for off-season maintenance when the towline initially separated during a storm on Thursday.

The Aiviq then lost power, and other support ships and a Coast Guard cutter were brought in to help with engine repairs and to reconnect towlines to the Kulluk, which does not have its own propulsion system. The 18 workers aboard the rig were evacuated by Coast Guard helicopters on Saturday.

Over the weekend, support crews struggled in 25-foot swells to reconnect towlines, succeeding several times. But each time the lines separated again, leaving the rig in danger of drifting toward land.

The Kulluk, which was built in Japan in 1983 and upgraded over the past six years at a cost of $292 million, is designed for icy conditions in the Arctic. It can drill in up to 400 feet of water and up to 20,000 feet deep. During drilling season it carries a crew of about 140 people, Mr. Smith said.

Shell has spent six years and more than $4 billion in its effort to drill in Arctic waters, one of the last untapped oil-producing regions in the United States. But the effort has faced regulatory hurdles and opposition from American Indian and environmental groups.

Last summer, the Kulluk drilled a shallow test well in the Beaufort Sea while another rig drilled a similar hole in the Chukchi Sea to the west.

But Shell announced in September that it would be forced to delay further drilling until this year after a specialized piece of equipment designed to contain oil from a spill was damaged in a testing accident.

The episode was one of a number of setbacks for the Arctic drilling program last year.

Shell now says it hopes to drill five exploratory wells in the region during the 2013 drilling season, which begins in mid-July.

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Body of Connecticut shooter Adam Lanza quietly claimed by his father

Newtown, Conn. shooter Adam Lanza's body has been claimed by his father.

The body of Newtown, Conn., shooter Adam Lanza was claimed by his father last week, a family spokesman said Monday. 

Peter Lanza claimed his son's body from the Connecticut medical examiner last Thursday, said family spokesman Errol Cockfield.

“Private arrangements took place over the weekend," Cockfield said. He declined to elaborate further about the nature of the arrangements.

Connecticut Chief State Medical Examiner H. Wayne Carver, confirmed that Lanza's body is "finally gone."

Adam Lanza, 20, killed 20 first-graders and six adults at Sandy Hook Elementary School on Dec. 14 and then committed suicide. He also killed his mother in their Newtown home before the rampag.

PHOTOS: Connecticut school shooting

A private funeral was held earlier this month in New Hampshire for his mother, Nancy Lanza, who was divorced from Peter Lanza.

Authorities have not offered a motive for the killings. State police say they have been exploring all aspects of Adam Lanza's life, including his education, family history and medical treatment for clues.

"Our family is grieving along with all those who have been affected by this enormous tragedy," Peter Lanza said in a statement in the days after the shooting. "No words can truly express how heartbroken we are. We are in a state of disbelief and trying to find whatever answers we can. We too are asking why."

Peter Lanza lives in Stamford, Conn., and is an executive with GE Energy Financial Services. 

Adam Lanza, who was known to be very shy, had a tight relationship with his mother but was estranged from his father after the couple's 2001 separation was finalized in a 2009 divorce.

FULL COVERAGE: Shooting at Connecticut school

Peter Lanza had seen his son weekly after the separation, according to a family acquaintance. But Adam Lanza began refusing to see him after Peter began seeing another woman whom he later married, according to Shelley Cudiner, an employee at the library at the University of Connecticut.

Adam Lanza also began refusing to see his brother, Ryan, an accountant in Manhattan, after their parents' 2009 divorce.

ALSO:

Pinnacles National Monument to become a park

FBI says woman sought funeral funds in Sandy Hook scam

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The Best of Exploration: Top 8 Stories of Space Exploration in 2012

Our recap of the year’s best exploratory exploits continues today with a look at the biggest developments in space exploration. 2012 saw the stunning debut of new spacecraft (Curiosity), the continued contributions of geriatric ones (Voyager), and the first full year since the end of the Space Shuttle program. Casey Dreier of The Planetary Society nominated 8 particularly meaningful developments from the last twelve months.

Image: Dreier’s pick for image of the year, a Cassini photograph of Saturn’s north pole through an infrared filter. (Credit: NASA / JPL / SSI / Emily Lakdawalla)

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Green Day to get back on road in March

NEW YORK (Reuters) – The members of Green Day said on Monday they will return to the road in March after the punk rock band canceled its fall club tour and postponed later dates as frontman Billie Joe Armstrong underwent treatment for substance abuse.

“We want to thank everyone for hanging in with us for the last few months,” the band members said in a statement on their website. “We are very excited to hit the road and see all of you again, though we regret having to cancel more shows.”

Armstrong, lead singer and guitarist for the Grammy-winning rock band, sought substance abuse treatment in September following an angry, guitar-smashing on-stage outburst in Las Vegas. The details of his addiction were never specified.

Armstrong, 40, added to the website posting with a note on Instagram, saying:

“Dear friends … I just want to thank you all for the love and support you’ve shown for the past few months. Believe me, it hasn’t gone unnoticed and I’m eternally grateful to have such an amazing set of friends and family.

“I’m getting better every day,” he said. “So now, without further ado, the show must go on. We can’t wait to get on the road and live out loud! Our passion has only grown stronger.”

The tour will begin in Chicago on March 28, with dates in Pittsburgh, New York, Toronto and other cities up through April 12 in Quebec City.

The band said it would announce additional West Coast dates in early 2013.

Tickets for the postponed shows will be honored at the new dates, Green Day said. Tickets for canceled shows will be refunded at the point of purchase.

In November the band moved up the release date of “iTré!,” part of an ambitious trilogy of albums that marks their first collection of new music since 2009, to December 11 from its original date of January 15, in part to make up for the canceled and postponed dates.

The California-based punk rock band, formed in the late 1980s, has sold more than 65 million records worldwide and won five Grammys, including best alternative album for its 1994 major-label debut, “Dookie,” and best rock album for “American Idiot” and “21st Century Breakdown.”

(Reporting by Chris Michaud; Editing by Jill Serjeant and Bill Trott)

Music News Headlines – Yahoo! News

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Well: Managing Diabetes, Then Told of Cancer

Nine years ago, Brenda Gray, a former schoolteacher in North Carolina, discovered she had Type 2 diabetes.

Since then, she has learned to manage the disease, diligently taking her medicine and keeping tabs on her blood sugar. But in September, she was told she had skin cancer, and her diabetes spun out of control.

Ms. Gray started an aggressive course of treatment that included radiation therapy. But the treatments weakened her and destroyed her appetite. Unable to eat, she developed dangerously low blood-sugar levels, and about two months ago, Ms. Gray’s daughter had to rush her to a hospital.

“She found me in bed shaking and sweating,” said Ms. Gray, who is 62 and lives in Durham. “When I got to the hospital, they couldn’t understand how I was still standing.”

Cancer and diabetes are two of the leading killers in America. Each can be a devastating diagnosis in its own right, but researchers are finding that the two often occur together. By some estimates, as many as one in five cancer patients also has diabetes.

In a recent joint report, the American Cancer Society and the American Diabetes Association noted that people with Type 2 diabetes have an increased risk of developing cancers of the liver, pancreas, colon and bladder. Researchers with the National Cancer Institute released a similar report last year, which found greater rates of cancer among diabetics, as well as an elevated risk of dying from cancer.

Experts say it is clear from accumulating clinical data that the two share some biological links. The problem results from simple demographics as well: with the rapid rise in Type 2 diabetes and a growing population of cancer survivors, the two diseases are coinciding more frequently in older patients.

“We are going to see a lot greater numbers of people with both diseases,” said Edward Giovannucci, a professor of nutrition and epidemiology at the Harvard School of Public Health and an author of the joint report. “By some estimates, the link between diabetes and cancer may quantitatively become even more important than the link between smoking and cancer.”

Already, oncologists say, it is not uncommon to encounter patients struggling to balance cancer treatments with insulin shots and diabetes drugs. Because cancer is generally seen as the more lethal of the two diseases, patients often make it the priority.

“Although cancer is no longer generally a death sentence, for many patients, they see it as that no matter what you say,” said Dr. June McKoy, a geriatric oncologist at the Northwestern University Feinberg School of Medicine. “Suddenly, they put their diabetes on the back burner, and they focus on the cancer.” But high blood sugar can damage kidneys and blood vessels, strain the immune system and worsen cancer prognosis.

Researchers say that the link between the two diseases is complex and driven by many factors. Typically, though, it is diabetes that sets the stage for cancer. “Most cancers don’t cause diabetes,” said Dr. Pankaj Shah, an endocrinologist at the Mayo Clinic in Rochester, Minn. “Mostly diabetes increases the risk of cancer.”

Type 2 diabetes is often preceded by chronically high insulin levels and high blood sugar, fertile conditions for cancer. Insulin is known to fuel cell growth, and cancer cells consume glucose out of proportion to other nutrients. The two diseases share many risk factors as well, including obesity, poor diet, physical inactivity, smoking and advanced age.

Another factor that complicates the relationship are the treatments given to patients. Diabetes drugs can have an impact on cancer prognosis and vice versa. Type 2 diabetics treated with the drug metformin, for example, develop cancer less frequently than diabetics given other medications. A number of clinical trials are now under way to see how well the drug performs as a cancer treatment.

Drugs used against cancer, on the other hand, tend to worsen diabetes. Chemotherapy can wreak havoc on blood sugar levels, and glucocorticoids, which are widely prescribed to alleviate nausea in cancer patients, promote insulin resistance, said Dr. Lorraine L. Lipscombe of Women’s College Hospital in Toronto.

Dr. Lipscombe was the lead author of a large study last month that found that breast cancer survivors were 20 percent more likely to receive a diabetes diagnosis than other women. The study found evidence that glucocorticoids and chemotherapy may hasten the onset of diabetes.

“They don’t cause diabetes in everyone, but they can bring out or unmask it in people who might already be vulnerable,” she said.

For diabetics who are used to tightly monitoring their blood sugar levels, the impact of cancer drugs can be alarming. Rigoberto Cortes, 71, a former metal worker in Chicago, has had Type 2 diabetes for over two decades. A year ago, he was told he had Stage 3 colon cancer.

“When I started chemotherapy, my sugar level was going way up and way down like never before,” he said. “I kept asking my oncologist what I should do.”

Mr. Cortes said his oncologist was not very concerned by the blood sugar swings. He eventually got a second opinion and switched doctors. He also lost weight and changed his eating habits, which helped minimize his blood sugar swings.

Although every case is different, the general strategy in treating such patients should be to get the cancer under control first, said Dr. Shah at the Mayo Clinic.

“Diabetes treatment essentially is given to prevent long-term complications,” he added.

At some hospitals, oncologists may take responsibility for managing blood sugar and other diabetes concerns in their cancer patients. But ideally, treatments should be coordinated by a team that includes a certified diabetes educator.

“They go over diet with the patient, review their medication, review their insulin,” said Dr. McKoy of Northwestern. “They can play a big role.”

For a diabetic trying to navigate the world of cancer, or a cancer patient navigating the world of diabetes, such interventions can be crucial. In a study published in October, Dr. McKoy and her colleagues looked at several years of health records for over 200,000 people with Type II diabetes who developed cancer.

Those who underwent a diabetes counseling session after their cancer diagnosis — consisting of two sessions a week for four to six weeks — were more likely to receives tests of hemoglobin A1c levels, a barometer of how well blood sugar has been controlled over time, and to take care of their blood sugar levels. As a result, they had fewer emergency room visits, fewer hospital admissions and lower health care costs.

Ms. Gray, the former schoolteacher in Durham, learned this firsthand. After her recent emergency, she worked with a diabetes educator at Duke University Hospital. Ms. Gray learned tips and strategies to balance the two diseases, including ways to keep her blood sugar normal when cancer treatments ruin her appetite.

“I came into the hospital and they got me back on track,” she said. “I was just so focused on the cancer. It changed everything. But I’ve learned how to face this.”

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Shape of Fiscal Deal Emerging, but Spending Still at Issue

WASHINGTON — Vice President Joseph R. Biden Jr. and Senator Mitch McConnell, the Republican leader, on Monday reached agreement on a tentative deal to stave off large tax increases starting on Tuesday, but remained stuck on whether and how to stop $110 billion in across-the-board spending cuts in 2013, an official familiar with the negotiations said.

Speaking at the Eisenhower Executive Office Building, adjacent to the White House, President Obama took note of the progress.

“Today it appears that an agreement to prevent this New Year’s tax hike is within sight, but it is not done,” he said. “There are still issues left to resolve, but we are hopeful that Congress can get it done. But it is not done.”

Mr. Obama used the occasion to warn Republicans that he would continue to press for more tax increases even beyond whatever may be included in a deal now. “If Republicans think I will finish the job of deficit reduction through spending cuts alone,” he said, then “they’ve got another thing coming. That’s not how it’s going to work.”

Republicans responded to the president’s speech angrily, accusing him of “moving the goal posts” just when a deal was in reach. They said that they knew that the two sides still had to agree on how to suspend the automatic spending cuts, but that they generally agreed that such a suspension would be offset, at least partially, by spending cuts elsewhere. Instead, the president said any deal to turn off the so-called sequester had to be financed by tax increases and spending cuts in concert.

“My heart is still pounding,” said Senator Bob Corker, Republican of Tennessee, expressing anger broadly felt by Republicans who said they were blindsided.

Mr. McConnell, of Kentucky, went to the Senate floor Monday afternoon, calling on Congress to act on the tax agreement and leave a deal on automatic spending cuts for the coming days. “Let’s pass the tax relief portion now,” he said. “Let’s take what’s been agreed to and get moving. The president wants this, members of Congress want to protect taxpayers, and we can get it done now.”

Under the emerging deal, income taxes would rise to 39.6 percent from 35 percent on income over $400,000 for single people and $450,000 for couples. Above those income levels, dividends and capital gains tax rates would also rise, to 20 percent from 15 percent.

The official familiar with the deal stressed that taxes would rise in some sense on the top 2 percent of earners, as Mr. Obama had wanted. That is because the deal would reinstate provisions to tax law, ended by the Bush tax cuts of 2001, that phase out personal exemptions and deductions for the affluent. Those phaseouts, under the agreement, would begin at $250,000 for single people and $300,000 for couples.

The estate tax would also rise, but considerably less than Democrats had wanted. The value of estates over $5 million would be taxed at 40 percent, up from the current 35 percent. Democrats had wanted a 45 percent rate on inheritances larger than $3.5 million.

Under the deal, the new rates on income, investment and inheritances would be permanent.

Mr. Obama and the Democrats would be granted a five-year extension of tax cuts they won in the 2009 stimulus law for middle-class and working-poor taxpayers. Those include a child credit that goes out as a check to workers who do not earn enough money to pay income taxes, an expanded earned income credit and a refundable credit for tuition.

Democrats also secured a full year’s extension of unemployment insurance without strings attached, a $30 billion cost.

All combined, the official said, the new package would raise about $600 billion over 10 years, compared to the revenue generated if current tax levels were simply extended. That, he said, is 85 percent of the revenue Democrats had wanted to raise under Mr. Obama’s initial proposal, which would have raised around $700 billion.

In addition, the deal would stave off sharp cuts for one year to health care providers who treat Medicare patients. That cost, about $30 billion, would be paid for with cuts to other health care programs.

But a final deal is being held up by one last question: What to do about $110 billion in automatic spending cuts set to begin Jan. 2.

While Republicans want them to go into force unless they are replaced by spending cuts elsewhere, Senate Democrats want to put them on “pause” for at least a year. All sides are angry over the impasse.

Mr. McConnell’s solution is likely to be resisted by Democrats, who will see it as a clear Republican victory with the spending cuts remaining in place. But many Republicans are just as opposed to those cuts as Democrats because they hit defense programs especially hard. Pressure would continue to mitigate or reverse the damage.

“Let me be clear,” Mr. McConnell said, “we will continue to work on finding smarter ways to cut spending, but let’s not let that hold up protecting Americans from the tax hike that will take place in about 10 hours. We can do this. We must do this.”

Robert Pear, John M. Broder and Jennifer Steinhauer contributed reporting.

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Sens. Feinstein, Graham clash on gun control

If Washington’s effort to reach a deal on the "fiscal cliff" looks daunting, just wait for the debate over what to do about mass shootings like the one that killed 20 children and six adults at an elementary school in Newtown, Conn.

Appearing on "Fox News Sunday," Sen. Dianne Feinstein (D-Calif.) and Sen. Lindsey Graham (R-S.C.) clashed sharply over Feinstein’s proposal to ban military-style assault weapons.

“The question comes, what do we do about the growing sophistication of military weapons on the streets of our cities?” Feinstein said. 

“When you have someone walking in and slaying, in the most brutal way, 6-year olds, something is really wrong,” said Feinstein, who has made gun control a key issue since her days as president of the San Francisco Board of Supervisors in 1978 when her colleague Harvey Milk and the city’s mayor, George Moscone, were shot and killed in City Hall by a rival politician.

PHOTOS: Notable moments of the 2012 presidential election

Feinstein has proposed a prohibition on the type of semi-automatic rifles used in the Newtown shooting and other recent mass killings, adding that her bill would be much tougher than the loophole-ridden assault weapons ban in place from 1994-2004. Assault rifles already in circulation would remain legal, but the owners would have to register them and become licensed. Her bill also would ban high-capacity magazines.

Limiting guns is precisely the wrong answer, Graham responded.

Crime is at record lows in part because guns are more widespread than ever, he said. He endorsed the proposal by the National Rifle Assn. to put armed guards in every school. He said he owns an AR-15, the type of semi-automatic rifled used by Adam Lanza in the Newtown school shooting.

“What she is proposing is a massive intervention,” Graham said. “Gun sales are up, and crime is down.  You’re not going to be able to stop mass murderers with no criminal record just by taking my AR-15 and making me pay $200 and get my fingerprints and say I can’t buy another one.

"The best solution to protect children is to have somebody there to stop the shooter, not get everybody’s gun in the country."

Feinstein responded that there was an armed guard at Columbine High School in 1999, but he was unable to “stop the shooters,” Eric Harris and Dylan Klebold, who killed 15 people and wounded 23.

Appearing on NBC’s "Meet the Press," President Obama, who supports an assault weapons ban, said such measures could only be enacted if the public puts pressure on Congress.

“We're not going to get this done unless the American people decide it's important,” Obama said.

“And so this is not going to be simply a matter of me spending political capital," Obama said. "One of the things that you learn, having now been in this office for four years, is the old adage of Abraham Lincoln's -- that with public opinion there's nothing you can't do and without public opinion there's very little you can get done in this town.”

Obama said he would make a series of proposals and put “my full weight behind it … but ultimately the way this is going to happen is because the American people say, ‘That's right. We are willing to make different choices for the country and we support those in Congress who are willing to take those actions.’ And will there be resistance? Absolutely there will be resistance.”

The day of the Newtown shootings, he said, “was the worst day of my presidency.”

But the question is “whether we are actually shook up enough by what happened here that it does not just become another one of these routine episodes where it gets a lot of attention for a couple of weeks and then it drifts away.”

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Wired Science's Top Image Galleries of the Year

Many of our most popular posts are image galleries, and this year our readers favorite collections included microscope photos, doomsday scenarios, auroras and lots of images of Earth from space.

The satellite image above of Brasilia is part of the most popular post of the year.

Above:

I think it's safe to say that our readers like looking at images of Earth from space almost as much as we do. Satellite imagery was the subject of four of Wired Science's 10 most popular galleries of 2012, with this gallery of planned cities topping the list.

See the full gallery.

Image: NASA/USGS

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‘The Hobbit’ stays atop box office for third week

LOS ANGELES (AP) — “The Hobbit: An Unexpected Journey” continues to rule them all at the box office, staying on top for a third-straight week with nearly $ 33 million.

The Warner Bros. fantasy epic from director Peter Jackson, based on the J.R.R. Tolkien novel, has made $ 222.7 million domestically alone.

Two big holiday movies — and potential awards contenders — also had strong openings. Quentin Tarantino‘s spaghetti Western-blaxploitation mash-up “Django Unchained” came in second place for the weekend with $ 30.7 million. The Weinstein Co. revenge epic, starring Jamie Foxx and Christoph Waltz, has earned $ 64 million since its Christmas Day opening.

And in third place with $ 28 million was the sweeping, all-singing “Les Miserables.” The Universal Pictures musical starring Hugh Jackman and Anne Hathaway has made $ 67.5 million since debuting on Christmas.

Entertainment News Headlines – Yahoo! News

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Well: Exercise and the Ever-Smarter Human Brain

Anyone whose resolve to exercise in 2013 is a bit shaky might want to consider an emerging scientific view of human evolution. It suggests that we are clever today in part because a million years ago, we could outrun and outwalk most other mammals over long distances. Our brains were shaped and sharpened by movement, the idea goes, and we continue to require regular physical activity in order for our brains to function optimally.

Phys Ed

Gretchen Reynolds on the science of fitness.

The role of physical endurance in shaping humankind has intrigued anthropologists and gripped the popular imagination for some time. In 2004, the evolutionary biologists Daniel E. Lieberman of Harvard and Dennis M. Bramble of the University of Utah published a seminal article in the journal Nature titled “Endurance Running and the Evolution of Homo,” in which they posited that our bipedal ancestors survived by becoming endurance athletes, able to bring down swifter prey through sheer doggedness, jogging and plodding along behind them until the animals dropped.

Endurance produced meals, which provided energy for mating, which meant that adept early joggers passed along their genes. In this way, natural selection drove early humans to become even more athletic, Dr. Lieberman and other scientists have written, their bodies developing longer legs, shorter toes, less hair and complicated inner-ear mechanisms to maintain balance and stability during upright ambulation. Movement shaped the human body.

But simultaneously, in a development that until recently many scientists viewed as unrelated, humans were becoming smarter. Their brains were increasing rapidly in size.

Today, humans have a brain that is about three times larger than would be expected, anthropologists say, given our species’ body size in comparison with that of other mammals.

To explain those outsized brains, evolutionary scientists have pointed to such occurrences as meat eating and, perhaps most determinatively, our early ancestors’ need for social interaction. Early humans had to plan and execute hunts as a group, which required complicated thinking patterns and, it’s been thought, rewarded the social and brainy with evolutionary success. According to that hypothesis, the evolution of the brain was driven by the need to think.

But now some scientists are suggesting that physical activity also played a critical role in making our brains larger.

To reach that conclusion, anthropologists began by looking at existing data about brain size and endurance capacity in a variety of mammals, including dogs, guinea pigs, foxes, mice, wolves, rats, civet cats, antelope, mongooses, goats, sheep and elands. They found a notable pattern. Species like dogs and rats that had a high innate endurance capacity, which presumably had evolved over millenniums, also had large brain volumes relative to their body size.

The researchers also looked at recent experiments in which mice and rats were systematically bred to be marathon runners. Lab animals that willingly put in the most miles on running wheels were interbred, resulting in the creation of a line of lab animals that excelled at running.

Interestingly, after multiple generations, these animals began to develop innately high levels of substances that promote tissue growth and health, including a protein called brain-derived neurotrophic factor, or BDNF. These substances are important for endurance performance. They also are known to drive brain growth.

What all of this means, says David A. Raichlen, an anthropologist at the University of Arizona and an author of a new article about the evolution of human brains appearing in the January issue of Proceedings of the Royal Society Biology, is that physical activity may have helped to make early humans smarter.

“We think that what happened” in our early hunter-gatherer ancestors, he says, is that the more athletic and active survived and, as with the lab mice, passed along physiological characteristics that improved their endurance, including elevated levels of BDNF. Eventually, these early athletes had enough BDNF coursing through their bodies that some could migrate from the muscles to the brain, where it nudged the growth of brain tissue.

Those particular early humans then applied their growing ability to think and reason toward better tracking prey, becoming the best-fed and most successful from an evolutionary standpoint. Being in motion made them smarter, and being smarter now allowed them to move more efficiently.

And out of all of this came, eventually, an ability to understand higher math and invent iPads. But that was some time later.

The broad point of this new notion is that if physical activity helped to mold the structure of our brains, then it most likely remains essential to brain health today, says John D. Polk, an associate professor of anthropology at the University of Illinois at Urbana-Champaign, and co-author, with Dr. Raichlen, of the new article.

And there is scientific support for that idea. Recent studies have shown, he says, that “regular exercise, even walking,” leads to more robust mental abilities, “beginning in childhood and continuing into old age.”

Of course, the hypothesis that jogging after prey helped to drive human brain evolution is just a hypothesis, Dr. Raichlen says, and almost unprovable.

But it is compelling, says Harvard’s Dr. Lieberman, who has worked with the authors of the new article. “I fundamentally agree that there is a deep evolutionary basis for the relationship between a healthy body and a healthy mind,” he says, a relationship that makes the term “jogging your memory” more literal than most of us might have expected and provides a powerful incentive to be active in 2013.

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