Senate Passes Tax Increases on Wealthy Americans

Drew Angerer/Getty Images

Senator Mitch McConnell, the Republican leader, was surrounded by reporters as he walked to his office late Monday.

WASHINGTON — The Senate, in a pre-dawn vote two hours after the deadline passed to avert automatic tax increases, overwhelmingly approved legislation on Tuesday that would allow tax rates to rise only on affluent Americans while temporarily suspending sweeping, across-the-board spending cuts.

The deal, worked out in furious negotiations between Vice President Joseph R. Biden Jr. and the Republican Senate leader, Mitch McConnell, passed 89 to 8, with just three Democrats and five Republicans voting no. Although it lost the support of some of the Senate’s most conservative members, the broad coalition that pushed the accord across the finish line could portend swift House passage as early as New Year’s Day.

Quick passage before the markets reopen on Wednesday would likely negate any economic damage from Tuesday’s breach of the so-called “fiscal cliff” and largely spare the nation’s economy from the one-two punch of large tax increases and across-the-board military and domestic spending cuts in the New Year.

“This shouldn’t be the model for how to do things around here,” Mr. McConnell said just after 1:30 a.m. “But I think we can say we’ve done some good for the country.”

Mr. Biden, after a late New Year’s Eve meeting with leery Senate Democrats to sell the accord, said: “You surely shouldn’t predict how the House is going to vote. But I feel very, very good.”

The eight senators who voted no included Marco Rubio, Republican of Florida and a potential presidential candidate in 2016, two of the Senate’s most ardent small-government Republicans, Rand Paul of Kentucky and Mike Lee of Utah, and Senator Charles E. Grassley of Iowa, who as a former Finance Committee chairman helped secure passage of the Bush-era tax cuts, then opposed making almost all of them permanent on Tuesday. Two moderate Democrats, Thomas R. Carper of Delaware and Michael Bennet of Colorado, also voted no, as did the liberal Democrat Tom Harkin, who said the White House had given away too much in the compromise. Senator Richard C. Shelby, Republican of Alabama, also voted no.

The House Speaker, John A. Boehner, and the Republican House leadership said the House would “honor its commitment to consider the Senate agreement.” But, they added, “decisions about whether the House will seek to accept or promptly amend the measure will not be made until House members — and the American people — have been able to review the legislation.”

Even with that cautious assessment, Republican House aides said a vote Tuesday was possible.

Under the agreement, tax rates would jump to 39.6 percent from 35 percent for individual incomes over $400,000 and couples over $450,000, while tax deductions and credits would start phasing out on incomes as low as $250,000, a clear victory for President Obama, who ran for re-election vowing to impose taxes on the wealthy.

Just after the vote, Mr. Obama called for quick House passage of the legislation.

“While neither Democrats nor Republicans got everything they wanted, this agreement is the right thing to do for our country and the House should pass it without delay,” he said.

Democrats also secured a full year’s extension of unemployment insurance without strings attached and without offsetting spending cuts, a $30 billion cost. But the two-percentage point cut to the payroll tax that the president secured in late 2010 lapsed at midnight and will not be renewed.

In one final piece of the puzzle, negotiators agreed to put off $110 billion in across-the-board cuts to military and domestic programs for two months while broader deficit-reduction talks continue. Those cuts begin to go into force on Wednesday, and that deadline, too, might be missed before Congress approves the legislation.

To secure votes, Senator Harry Reid, the Senate Democratic leader, also told Democrats the legislation would cancel a pending Congressional pay raise — putting opponents in the politically difficult position of supporting a raise — and extend an expiring dairy policy that would have seen the price of milk double in some parts of the country.

The nature of the deal ensured that the running war between the White House and Congressional Republicans on spending and taxes would continue at least until the spring. Treasury Secretary Timothy F. Geithner formally notified Congress that the government reached its statutory borrowing limit on New Year’s Eve. Through some creative accounting tricks, the Treasury Department can put off action for perhaps two months, but Congress must act to keep the government from defaulting just when the “pause” on pending cuts is up. Then in late March, a law financing the government expires.

Jennifer Steinhauer and Robert Pear contributed reporting.

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This Rose Parade marks a major step for a young float designer

Charles Meier pulled his first all nighter when he was 11 years old. His mother found him asleep in a flower box.

It was the night before final judging for the 1990 Rose Parade. Meier, a volunteer, had been running around for hours helping float decorators fill vials of water, scrape seeds and glue last-minute details. Exhausted, he finally crawled into a box that still smelled of orchids.

His parents snapped a picture, not knowing that their son would go on to win South Pasadena's float design contest just two years later, making him the youngest designer in Rose Parade history.

Nor did they imagine he would one day break through a tight-knit institution and start his own float company. When the 124th Rose Parade rolls out Tuesday, Meier's company will be the event's first new professional builder in almost two decades.

"I basically traded in stuffed animals for Rose Parade floats," said Meier, 34. "Other kids were at home reading comic books, and I'm here organizing my float pictures into photo albums. It was what captured my imagination."

::

Meier still remembers the moment he fell in love.

He was 9 years old, sitting in grandstand seats his parents had won in a raffle. It was sensory overload: Booming marching bands. Floats adorned with tractors and dancers on a giant piano. And color. So much color.

He started drawing floats that day. He studied flowers, memorized parade brochures and, accompanied by his parents, joined float decorating committees. He couldn't stop talking about his ideas.

"I don't want to hear you describe another float," his mother, Carol, told him. "Just draw one and send it in and see if they will build it."

Every year, he submitted designs to his hometown float committee. On his 13th birthday, South Pasadena selected his drawing. Instead of letting the experts take over, he insisted on working with the graphic designer on his vision of two aliens playing tug-of-war with a spaceship.

"It was really kind of funny. He was so young. I mean, he was 13, just a kid," said Dex Regatz, 82, the graphic designer who took Meier under his wing.

"Before they knew it, I had insisted I do the complete floral plan," Meier said. "And they actually took most of those ideas and ran with them."

He quickly became a live encyclopedia of flowers and colors.

He once exercised his mental floral database by designing a Valentine-themed float with 94 types of roses, an unmatched feat in Rose Parade annals. He juggled hot pink Hot Ladys, bicolored Panamas and King Kongs with hints of green.

He experiences his life through the prism of floats. Walking across moss inspired the furry texture for an animal. Coconut flakes, so white he thought they sparkled, looked perfect for celestial stars and eyeballs.

::

To pay his bills, Meier worked as a senior caretaker and freelance floral designer.

But on the side, he continued to volunteer for South Pasadena and Sierra Madre. He won fans with his enthusiasm, many said, and he treated each float as an intricate work of art.

"I'm always so impressed with his floats. You can stand anywhere, from any angle, and it looks good," said Gwen Robertson, a longtime Sierra Madre volunteer.

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In Memoriam: 9 Tech Titans Who Died in 2012

"We made machines for the masses," said Jack Tramiel, the founder of the company that gave the world the Commodore 64. Then he nodded to the man sitting beside him, Apple co-founder Steve Wozniak. "They made machines for the classes."

The year was 2007, and Tramiel was on stage at the Computer History Museum in Mountain View, California, celebrating the 25th anniversary of the Commodore 64, a machine that debuted in August 1982 with a price tag of $595 and was soon selling for a mere $199. That made it several hundred dollars cheaper than the Apple II offered by Wozniak and fellow Apple man Steve Jobs — not to mention the IBM PC — and according to Tramiel, Commodore sold nearly half a million machines a month before he left the company in 1984.

All told, Tramiel said that night, somewhere between 22 million and 30 million Commodore 64s were sold, which likely makes it the best-selling home computer of all time. "We sold half that many," said ex-IBM exec William Love, referring to the original IBM PC.

Tramiel passed away this past April at the age of 83, and though he may not have been a household name, the Commodore 64 certainly was.

He was just one of several tech titans who died over the past year. None had the name recognition of a Steve Jobs -- who passed in 2011 -- but they may have moved our world in bigger ways. Among those that passed in 2013 are the IBMer who invented the bar code and the Zenith engineer who devised the first wireless TV remote -- not to mention one of the physicist who helped built the atom bomb dropped on Nagasaki. Click on the images above to remember them all.

Above:

Jack Tramiel was born to a Jewish family in Poland in 1928, and during the war, he was sent to Auschwitz, before he was moved with his father to a labor camp in Germany. He was freed in 1945 and emigrated to the States two years later, and in the mid-1950's, he founded a business called Commodore.

At first, it dealt in typewriters, but then it moved to adding machines, calculators, and, yes, home computers. After he was forced out of Commodore in 1984, Tramiel bought the consumer division of game outfit Atari and reformed it as Atari Corporation, which he ran until the end of the decade.

Photo: Sal Veder / AP

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Kanye West, Kim Kardashian expecting baby: reports

(Reuters) – Rapper Kanye West and reality TV star Kim Kardashian are expecting their first child, celebrity media outlets reported on Monday.

Fans and family took to Twitter to congratulate the celebrity power couple.

“Been wanting to shout from the rooftops with joy and now I can!” wrote Kardashian’s sister Kourtney. “Another angel to welcome to our family. Overwhelmed with excitement!”

According to E! News, West, 35, announced the news from the stage at a concert in Atlantic City on Sunday.

Kardashian, 32, who rose to fame five years ago for her appearances in reality TV show “Keeping Up with the Kardashians”, was the most-searched person on the Yahoo! website in 2012.

She married basketball player Kris Humphries in August, 2011, in a lavish, made-for-TV wedding, but the couple divorced just 72 days later.

(Editing by Paul Casciato)

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Chinese Firm Is Cleared to Buy American DNA Sequencing Company

Ramin Rahimian for The New York Times

DNA sequencing machines at Complete Genomics in California. The firm dismissed concerns about its acquisition.

The federal government has given national security clearance to the controversial purchase of an American DNA sequencing company by a Chinese firm.

The Chinese firm, BGI-Shenzhen, said in a statement this weekend that its acquisition of Complete Genomics, based in Mountain View, Calif., had been cleared by the federal Committee on Foreign Investment in the United States, which reviews the national security implications of foreign takeovers of American companies. The deal still requires antitrust clearance by the Federal Trade Commission.

Some scientists, politicians and industry executives had said the takeover represented a threat to American competitiveness in DNA sequencing, a technology that is becoming crucial for the development of drugs, diagnostics and improved crops.

The fact that the $117.6 million deal was controversial at all reflects a change in the genomics community.

A decade ago, the Human Genome Project, in which scientists from many nations helped unravel the genetic blueprint of mankind, was celebrated for its spirit of international cooperation. One of the participants in the project was BGI, which was then known as the Beijing Genomics Institute.

But with DNA sequencing now becoming a big business and linchpin of the biotechnology industry, international rivalries and nationalism are starting to move front and center in any acquisition.

Much of the alarm about the deal has been raised by Illumina, a San Diego company that is the market leader in sequencing machines. It has potentially the most to lose from the deal because BGI might buy fewer Illumina products and even become a competitor. Weeks after the BGI deal was announced, Illumina made its own belated bid for Complete Genomics, offering 15 cents a share more than BGI’s bid of $3.15. But Complete Genomics rebuffed Illumina, saying such a merger would never clear antitrust review.

Illumina also hired a Washington lobbyist, the Glover Park Group, to stir up opposition to the deal in Congress. Representative Frank R. Wolf, Republican of Virginia, was the only member of Congress known to have publicly expressed concern.

BGI and Complete Genomics point out that Illumina has long sold its sequencing machines — including a record-setting order of 128 high-end machines — to BGI without raising any security concerns. Sequencing machines have not been subject to export controls like aerospace equipment, lasers, sensors and other gear that can have clear military uses.

“Illumina has never previously considered its business with BGI as ‘sensitive’ in the least,” Ye Yin, the chief operating officer of BGI, said in a November letter to Complete Genomics that was made public in a regulatory filing. In the letter, Illumina was accused of “obvious hypocrisy.”

BGI and Complete said that Illumina was trying to derail the agreement and acquire Complete Genomics itself in order to “eliminate its closest competitor, Complete.”

BGI is already one of the most prolific DNA sequencers in the world, but it buys the sequencing machines it uses from others, mainly Illumina.

Illumina, joined by some American scientists, said it worried that if BGI gained access to Complete’s sequencing technology, the Chinese company might use low prices to undercut the American sequencing companies that now dominate the industry.

Some also said that with Complete Genomics providing an American base, BGI would have access to more DNA samples from Americans, helping it compile a huge database of genetic information that could be used to develop drugs and diagnostic tests. Some also worried about protection of the privacy of genetic information.

“What’s to stop them from mining genomic data of American samples to some unknown nefarious end?” Elaine R. Mardis, co-director of the genome sequencing center at Washington University in St. Louis, said in an e-mail.

Dr. Mardis could not specify what kind of nefarious end she imagined. But opponents of the deal cited a November article in The Atlantic saying that in the future, pathogens could be genetically engineered to attack particular individuals, including the president, based on their DNA sequences.

BGI and Complete Genomics dismissed such concerns as preposterous.

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Immigration reform could get overshadowed in Congress

WASHINGTON — The window to pass immigration laws next year is narrowing as the effort competes with a renewed debate over gun laws and the lingering fight over taxes and the budget, according to congressional staffers and outside advocates.

Key congressional committees are preparing for a package of gun control laws to be negotiated and possibly introduced in Congress during the first few months of next year. The shift would push the debate in Congress over immigration reform into the spring.

But as budget negotiations continue to stir tensions between Republicans and Democrats, and as lobbyists take to their corners over gun laws, some are concerned that the heated atmosphere could spoil the early signs of bipartisan cooperation on immigration that emerged after the election.

In phone calls over the holidays, White House officials sought to reassure advocates that the push for gun control won't distract President Obama from his promise to stump for new immigration legislation early in the year.

The uncertainty is feeding jitters that Obama may be unable to deliver on his long-standing promise to create a path to citizenship for the 11 million people in the U.S. unlawfully.

"I am concerned that an issue such as immigration where we can find strong bipartisan consensus will be demagogued and politicized, because that is the environment," said Alfonso Aguilar, a Republican strategist at the Latino Partnership for Conservative Principles, a Washington-based nonprofit.

New gun laws would probably have to pass through the Senate Judiciary Committee, the same committee that would work on an immigration bill that could be hundreds of pages long.

The tough work of hammering out a compromise over immigration in the committee would best be wrapped up by the end of June, congressional staffers said, in case one of the Supreme Court justices retires, which would set up a high-profile and time-consuming nomination process that could overshadow the immigration issue.

"Voters want to see action," said Clarissa Martinez de Castro, head of civic engagement and immigration for the National Council of La Raza. "If the American public every day has to grapple with multiple priorities, that is the least they expect from their members of Congress."

After the Dec. 14 school shooting that killed 20 children and six adults in Newtown, Conn., Obama tapped Vice President Joe Biden to head a task force that is expected to propose new gun control measures by the end of January.

"The question is: Would the Congress love to have something come along that would sidetrack immigration reform? I believe there are some members of Congress who would like that," said Eliseo Medina, secretary-treasurer of the Service Employees International Union, which represents more than 2 million workers.

"But the fact is, they won't have the luxury of ignoring it," he said.

The crowded agenda has not changed plans by advocacy groups to launch a nationwide publicity and lobbying campaign early next year to put pressure on lawmakers to support changing immigration laws.

"As horrific as the tragedy was in Connecticut, in the grand scheme of things, these issues can run on parallel tracks," said Mary Giovagnoli, director of the Immigration Policy Center, a think tank based in Washington.

"They are not in competition; they are complementary," said Angela Kelley, an expert on immigration at the Center for American Progress, a liberal think tank in Washington. "The White House can walk and chew gum, as can lawmakers."

"If [lawmakers] are working 40 hours a week, they should be able to get both done," she said.

brian.bennett@latimes.com

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Wired Science Space Photo of the Day: Hidden Flames

This composite image combines EIT images from three wavelengths (171Å, 195Å and 284Å) into one that reveals solar features unique to each wavelength. Since the EIT images come to us from the spacecraft in black and white, they are color coded for easy identification. For this image, the nearly simultaneous images from May 1998 were each given a color code (red, yellow and blue) and merged into one.

Image: NASA/SOHO [high-resolution]

Caption: NASA

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Hot spots draw believers, but not doomsday

As the sun rose from time zone to time zone across the world on Friday, there was still no sign of the world’s end — but that didn’t stop those convinced that a 5,125-year Mayan calendar predicts the apocalypse from gathering at some of the world’s purported survival hot spots.

Many of the esoterically inclined expected a new age of consciousness — others wanted a party. But, in some places said to offer salvation from the end, fewer people showed up than officials had predicted — much to the disappointment of vendors hoping to sell souvenirs.

Here are some key places being marked by the fascination over doomsday rumors:

MEXICO

In an area of Mexico that was once the ancient Mayan heartland, spiritualists gathered in the darkness before dawn on Friday to prepare white clothes, drums, conch shells and incense. They believed the sunrise would herald the birth of a new and better age as a vast cycle in the Mayan calendar comes to an end.

Many people who came to Yucatan for the occasion were already calling it “a new sun” and “a new era.”

FRANCE

According to one rumor, a rocky mountain in the French Pyrenees will be the sole place on Earth to escape destruction. A giant UFO and aliens are said to be waiting under the mountain, ready to burst through and spirit those nearby to safety. But there is bad news for those seeking salvation: French gendarmes, some on horseback, blocked outsiders from reaching the Bugarach peak and its village of some 200 people.

Eric Freysselinard, head of local government, said the security forces had “partially stopped the new age enthusiasts as well as curious people from coming to the area.”

Meanwhile, some Bugarach residents dressed up like aliens, with tinfoil costumes and funnels and fake antenna on their heads, strolling around their village Friday to make light of the rumored UFO prophecy.

RUSSIA

Doomsday rumors have prompted some people across Russia to stock up on candles, water, canned foods and other non-perishable foods. The apocalypse has proven a good business, with some shops selling survival aid packages that include soap and vodka.

In Moscow, salvation has also been promised in the underground bunker for the former Soviet dictator Josef Stalin — with a 50 percent refund if nothing happens. An underground stay was originally priced at 50,000 rubles ($ 1,625) but dropped to 15,000 ($ 490) a week ahead of the feared end.

The bunker, located 65 meters (210 feet) below ground, was designed to withstand a nuclear attack. Now home to a small museum, it has an independent electricity supply, water and food — but no more room, because the museum has already sold out all 1,000 tickets.

BRITAIN

Hundreds of people have converged on Stonehenge for an “End of the World” party that coincides with the Winter Solstice.

Arthur Uther Pendragon, Britain’s best-known druid, said he was anticipating a much larger crowd than usual at Stonehenge this year. But he doesn’t agree that the world is ending, noting that he and fellow druids believe that things happen in cycles.

“We’re looking at it more as a new beginning than an end,” he said. “We’re looking at new hope.”

Meanwhile, end-of-days parties will be held across London on Friday. One event billed as a “last supper club” is offering a three-course meal served inside an “ark.”

SERBIA

Some Serbs are saying to forget that sacred mountain in the French Pyrenees. The place to be Friday is Mount Rtanj, a pyramid-shaped peak in Serbia already drawing cultists.

According to legend, the mountain once swallowed an evil sorcerer who will be released on doomsday in a ball of fire that will hit the mountain top. The inside of the mountain will then open up, becoming a safe place to hide as the sorcerer goes on to destroy the rest of the world. In the meantime, some old coal mine shafts have been opened up as safe rooms.

On Friday a New Age group called “The Spirit of Rtanj” was holding a conference there. Participants, however, said they expect not the end of time but the start of a new time cycle. Locals turned out to sell brandy and herbs.

“There will be no tragedy, no doomsday,” said resident Dalibor Jovic. “It was supposed to happen at 12:12 and I think that time has passed. So, we can now go on with our lives and be happy to be alive.”

TURKEY

A small Turkish village known for its wines, Sirince, has also been touted as the only place after Bugarach that would escape the world’s end. But on Friday journalists and security officials outnumbered cultists. This outcome disappointed local business people who had prepared a range of doomsday products to sell, including a specially labeled Doomsday wine and Turkish delight candy whose “best before” date was Dec. 21, 2012. One restaurant prepared a special “last meal” menu that included a “heaven kebab” and “forbidden fruit dessert.”

ITALY

Another spot said to be spared: Cisternino, a beautiful small town in southern Italy in an area of trulli, traditional dry stone huts with conical roofs. The notion that Cisternino could be a safe haven at world’s end derives from an Indian guru, Babaji, who said “Cisternino will become an island” at world’s end. His followers built a community in Cisternino centered on an ashram built in 1979. Hotel bookings are up this weekend.

Mayor Donato Baccaro told the AP that the beauty of the place has inspired many foreigners to live there. “This confirms that this place has a special energy,” he said.

CHINA

A fringe Christian group has been spreading rumors about the world’s impending end, prompting Chinese authorities to detain more than 500 people this week and seize leaflets, video discs, books and other material.

Those detained are reported to be members of the group Almighty God, also called Eastern Lightning, which preaches that Jesus has reappeared as a woman in central China. Authorities in the province of Qinghai say they are waging a “severe crackdown” on the group, accusing it of attacking the Communist Party and the government.

U.S.

Dozens of Michigan schools canceled classes for thousands of students to cool off rumored threats of violence and problems related to doomsday. The fears were exacerbated by the recent shooting at a Connecticut elementary school, which “changed all of us,” the school system in Genesee County said. “Canceling school is the right thing to do.”

___

Associated Press writers Florent Bajrami in Bugarach, France; Mansur Mirovalev in Moscow; Peppino Ciraci in Cisternino, Italy; Suzan Fraser in Ankara, Turkey; Paisley Dodds in London; and Dejan Mladenovic in Mount Rtanj, Serbia, contributed to this report.

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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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Senate Leaders Racing to Beat Fiscal Deadline

WASHINGTON — Senate leaders and their aides spent Saturday searching for a formula to extend tax cuts for most Americans that could win bipartisan support in the Senate and final approval in the fractious House by the new year, hoping to prevent large tax increases and budget cuts that could threaten the fragile economy.

As part of the last-minute negotiations, the lawmakers were haggling over unemployment benefits, cuts in Medicare payments to doctors, taxes on large inheritances and how to limit the impact of the alternative minimum tax, a parallel income tax system that is intended to ensure the rich pay a fair share but that is increasingly encroaching on the middle class.

President Obama said that if talks between the Senate leaders broke down, he wanted the Senate to schedule an up-or-down vote on a narrower measure that would extend only the middle-class tax breaks and unemployment benefits. The Senate majority leader, Harry Reid of Nevada, said he would schedule such a vote on Monday absent a deal.

If Congress is unable to act before the new year, Washington will effectively usher in a series of automatic tax increases and a program of drastic spending cuts that economists say could pitch the country back into recession.

The president and lawmakers put those spending cuts in place this year as draconian incentives that would force them to confront the nation’s growing debt. Now, lawmakers are trying to keep them from happening, though it seemed most likely on Saturday that the cuts, known as sequestration, would be left for the next Congress, to be sworn in this week.

“We just can’t afford a politically self-inflicted wound to our economy,” Mr. Obama said Saturday in his weekly address. “The housing market is healing, but that could stall if folks are seeing smaller paychecks. The unemployment rate is the lowest it’s been since 2008, but already families and businesses are starting to hold back because of the dysfunction they see in Washington.”

The fear of another painful economic slowdown appears to have accelerated deal-making on Capitol Hill with just 48 hours left before the so-called fiscal cliff arrives. Weeks of public sniping between Mr. Reid, the Democratic leader, and Senator Mitch McConnell of Kentucky, the Republican leader, ebbed on Friday evening with pledges of cooperation and optimism from both.

On Saturday, though, that sentiment was put to the test as 98 senators waited for word whether their leaders had come up with a proposal that might pass muster with members of both parties. The first votes in the Senate, if needed, are scheduled for Sunday afternoon.

“It’s a little like playing Russian roulette with the economy,” said Senator Mark Warner, Democrat of Virginia. “The consequences could be enormous.”

Members of Congress were mostly absent from the Capitol on Saturday, after two days of Senate votes on other matters and a day before both chambers were to reconvene. However, senior aides were working on proposals in their offices or at their homes.

Speaker John A. Boehner stopped by the Capitol briefly to see his chief of staff on Saturday afternoon. Mr. McConnell spent much of the day in his office.

Aides to Mr. Reid were expecting to receive offers from Mr. McConnell’s staff, but no progress was reported by midday. Even if the talks took a positive turn, Senate aides said, no announcement was expected before the leaders briefed their caucuses on Sunday.

The chief sticking point among lawmakers and the president continued to be how to set tax rates for the next decade and beyond. With the Bush-era tax cuts expiring, Mr. Obama and Democrats have said they want tax rates to rise on income over $250,000 a year, while Republicans want a higher threshold, perhaps at $400,000.

Democrats and Republicans are also divided on the tax on inherited estates, which currently hits inheritances over $5 million at 35 percent. On Jan. 1, it is scheduled to rise to 55 percent beginning with inheritances exceeding $1 million.

The political drama in Washington over the weekend was given greater urgency by the fear that the economic gains of the past two years could be lost if no deal is reached.

Some of the consequences of Congressional inaction would be felt almost at once on Tuesday, in employee paychecks, doctors’ offices and financial markets. Analysts said the effect would be cumulative, building over time.

An early barometer would probably be the financial markets, where skittish investors, as they have during previous Congressional cliffhangers, could send the stock market lower on fears of another prolonged period of economic distress.

In 2011, the political battles over whether to raise the nation’s borrowing limit prompted Standard & Poor’s to downgrade its rating of American debt, suggesting a higher risk of default. The Dow Jones industrial average fell 635 points in a volatile day of trading after the downgrade.

This month, traders have again nervously watched the political maneuvering in Washington, and the markets have jumped or dropped at tidbits of news from the negotiations. Two weeks ago, Ben S. Bernanke, the chairman of the Federal Reserve Board, predicted that if lawmakers failed to reach a deal, “the economy will, I think, go off the cliff.”

Immediately — regardless of whether a deal is reached — every working American’s taxes will go up because neither party is fighting to extend a Social Security payroll tax cut that has been in place for two years.

Robert Pear and Jennifer Steinhauer contributed reporting.

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