A Bigger Tax Bite for Most Households Under Senate Plan





WASHINGTON — Only the most affluent American households would pay higher income taxes this year under the terms of a deal that passed the Senate early Tuesday morning, but most households would face higher payroll taxes because the deal does not extend a two-year-old tax break.




The legislation, which still must overcome resistance exhibited on Tuesday by House Republicans, would grant most Americans an instant reversal of the income tax increases that took effect with the arrival of the new year. Only about 0.7 percent of households would be subject to an income tax increase this year, according to the Tax Policy Center, a nonpartisan research group in Washington. The increases would apply almost exclusively to households making at least half a million dollars, the center estimated in an analysis published Tuesday.


But the Senate’s decision not to reverse a scheduled increase in the payroll tax that finances Social Security, while widely expected, still means that about 77 percent of households would pay a larger share of income to the federal government this year, according to the center’s analysis.


The tax this year would increase by two percentage points, to 6.2 percent from 4.2 percent, on all earned income up to $113,700.


Indeed, for most lower- and middle-income households, the payroll tax increase most likely would equal or exceed the value of the income tax savings. A household earning $50,000 in 2013, roughly the national median, would avoid paying about $1,000 more in income taxes — but still pay about $1,000 more in payroll taxes.


The timing and outcome of a House vote was unclear on Tuesday evening.


Sabrina Garcia, a 35-year-old accounting assistant from Quincy, Mass., who together with her husband made about $102,000 last year, said the payroll tax increase equated to “about $200 a month for my family. That’s a lot of money for us. It means we will have to cut back.” She said in an e-mail exchange that she most likely would postpone buying a new computer. “And forget about being able to save money,” she added.


The deal would impose larger tax increases on those who make the most. It would raise taxes in two different ways, by restoring limits on the amounts of income affluent Americans can shelter from federal taxation, and by restoring a top marginal tax rate of 39.6 percent. The current rate is 35 percent.


For married couples filing jointly, the deduction limits apply to income above $300,000, while the top tax rate kicks in above $450,000. But both numbers are somewhat misleading, because “income” in this context is a technical term, referring only to the portion of income subject to taxation after exemptions and deductions.


Few households with actual incomes of less than half a million dollars would face a tax increase. The Tax Policy Center calculated that less than 5 percent of families earning $200,000 to $500,000 would actually pay more.


The size of those increases would be much smaller than President Obama originally proposed. The net effect, according to the center’s estimates, is that the top 1 percent of households would see an average income tax increase this year of $62,000 rather than $94,000.“The high-income people really are doing very well in this compared to what the president wanted to do,” said Roberton Williams, a senior fellow at the Tax Policy Center.


The Senate deal would impose fewer limits on deductions than the White House plan. It also would tax income from dividends at a flat rate of 20 percent, rather than the same marginal rate as earned income. And there’s another important point, often misunderstood: Affluent households would pay the new 39.6 percent rate only on income above $450,000. They and everyone else would still pay lower rates on income below that threshold.


Households making $500,000 to $1 million would pay an additional $6,700 in taxes on average. Those making more than $1 million would pay an additional $123,000 on average.


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'Fiscal cliff' deal pleases few; House unlikely to vote Monday

Senate Minority Leader Mitch McConnell says he and the White House have made agreements on a "fiscal cliff" solution.









WASHINGTON – Details of the emerging “fiscal cliff” deal ricocheted through the Capitol on Monday, appearing to please almost no one from either political party, as President Obama urged negotiators toward a conclusion. A House vote appears unlikely on Monday, even if a deal is finished.


The contours of the agreement between Vice President Joe Biden and the Republican leader of the Senate, Mitch McConnell, put into sharp focus the compromises that need to be stomached if a deal was to be struck. The outcome remained uncertain as the country prepared to go off the “fiscal cliff.”


Even if agreement could be reached to have a Senate vote before the midnight deadline, when taxes on all Americans would rise if nothing was done, Speaker John A. Boehner (R-Ohio) was unlikely to call a vote in the House until Tuesday. 








“We are very, very close,” said an upbeat McConnell on the Senate floor after Obama spoke on the White House grounds and called on the country to urge lawmakers to finish. “We can do this.”


QUIZ: How much do you know about the fiscal cliff?


The emerging deal would raise taxes on income and investments for wealthier Americans – those  households making more than $450,000 a year or individuals earning more than $400,000– although the two sides remain at odds over the automatic spending cuts that make up part of the “fiscal cliff.”


McConnell and Biden continued talking throughout the afternoon Monday, as lawmakers prepared to hunker down for a long New Year’s Eve under the dome. A final deal could be voted on first by the Senate, possibly late Monday.


One result became increasingly clear, though: With many issues still unresolved, Washington was poised to continue the partisan budget battles that have defined recent years well into 2013.


As the sun began to set over the capital on a chilly winter day, rank-and-file lawmakers, both Democrats and Republicans, bristled at what they were being asked to accept.


The office of Senate Majority Leader Harry Reid, the hardscrabble Nevada deal-maker who stepped aside for Biden to negotiate with McConnell, offered a view of the level of concern. A revolving door of lawmakers came and went throughout the day.


Liberal Democrats objected that the White House was ceding too much to Republican demands and missing the opportunity for a broader budget deal. Conservative Republicans were upset at being asked to raise tax rates without reducing the deficit with steep cuts.


PHOTOS: Notable moments of the 2012 presidential election


“Republicans should kill the compromise if there are no spending cuts,” said Erick Erikson, the conservative founder of the influential Red State blog, in a tweet.


Both parties were under enormous pressure from their political bases not to give in to what some, including Sen. Tom Harkin (D-Iowa), a liberal leader, characterized as simply a “bad deal.”


More than $660 billion in revenue would be raised – far less than the target Obama first set in talks with congressional leaders. The president sought $1.6 trillion in new revenue from a large deficit-reduction package, and at least $800 billion in earlier talks with Republicans over a deal on tax increases.


The agreement would set the top tax rates at 39.6% for income above $450,000 for households and $400,000 for individuals, which is a narrower definition of who is wealthy than Obama once sought, according to a source who was not authorized to discuss the negotiations. The president won reelection campaigning on asking those who earn above $250,000 to contribute more in taxes.


Investment income tax rates would also rise for those higher-income households, from the historic low 15% rate on capital gains and dividends to a new 20% rate. The president had sought to tax dividends at the same rate as ordinary income, and his earlier offer sought to initiate those taxes at the lower $250,000 income threshold.


The estate tax, which has been a key sticking point throughout the weekend of negotiations, appears to have been settled. The agreement splits the difference, setting the new rate at 40% on estates valued at more than $5 million – a compromise between today’s 35% rate and the 45% rate Democrats sought on estates of $3.5 million or more.


Americans would benefit from an extension of long-term unemployment benefits, which expired over the weekend, for one full year.


One area that hewed closer to Democratic priorities was Obama’s proposal to reinstate the phaseout of personal exemption tax credits and itemized deductions on upper-income households. They had been in place before the George W. Bush-era tax cuts began in 2001, but were done away with over the past decade and would fully expire, with the rest of the tax breaks, on New Year’s Eve.





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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 “iTrĂ©!,” 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 is 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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A Year of Market Gains, Despite Political Turmoil


A year ago, some thought 2012 was destined to be the year that the euro zone — and maybe even the entire European Union — broke up. The banks that supported their governments, and that in turn depended on those same governments for bailouts if they went broke, were deemed to be particularly vulnerable to disaster.


It did not happen, and while the euro zone countries hardly solved their economic problems, the Continent’s stock markets turned out to be good investments in 2012, with bank shares among the best performers. The same could be said about the United States, where the broad stock market posted double-digit gains and Bank of America shares doubled in 2012, albeit from a very depressed level.


Over all, the Standard & Poor’s Euro 350-stock index was up 13 percent for the year, measured in euros, and more than 15 percent measured in dollars. The S.& P. 500 wound up the year with a gain of 13 percent.


It may have been typical of 2012 that it was politician and central bankers — not economic news or corporate developments — that dominated investor attention. As the year ended, the difference was that it was Washington, not Europe, where the squabbles were taking place.


For much of the year, it appeared that the European squabbles were leading nowhere, and by midsummer, markets were pessimistic about the outcome. Finally, Mario Draghi, the president of the European Central Bank, took decisive action to assure that the banks — and the governments that depended on them — would have access to funds. That did not turn around recessionary conditions in much of the euro zone, but it was enough to turn around financial markets. Prices of government bonds in many of the most troubled countries began to rise. Those who bet that Europe would solve its problems did well in the financial markets.


The accompanying charts show the performance of stocks in 10 economic sectors in both Europe and the United States, both in 2012 and since Oct. 9, 2007, the day that world stock markets peaked before what would turn out to be a world recession and credit crisis.


What stands out is how well financial stocks and consumer discretionary stocks did during 2012. The latter stocks are things purchased by consumers that are likely to do better when the economy is improving. In the United States, the two best such stocks in the S.& P. 500 were PulteGroup, a homebuilder, and Whirlpool, an appliance maker.


But while Europe did better in 2012, it remains much farther from recovering all of the losses experienced since the 2007 peak. The American index is just 9 percent lower than that, while the European index is about a third below where it was then. The only sectors that have completely made up their losses on both sides of the Atlantic are health care and consumer staples. In the United States, the consumer discretionary and information technology sectors have also done so, although the latter sector’s performance is largely because of Apple, whose shares are more than three times as high as they were in 2007.


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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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ken.dilanian@latimes.com





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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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