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Also: IMF chief warns of a "lost decade;" Greece's prime minister is expected to resign today; and Wal-Mart plans an ambitious expansion into medical care.

Cooked meat may be humans' most efficient energy source.

Giving Mini Burgers To Mice Reveals The Good And Bad Of Cooking Meat

Cooked meat delivers more energy than raw meat, which may have given our human ancestors a big evolutionary advantage. It may also explain why today's humans have a hard time keeping off the pounds, according to researchers at Harvard University.

Penn State Coach Paterno To Retire, Says 'I Wish I Had Done More'

The coach's decision to leave at the end of the season comes amid a scandal that has rocked Penn State and college football. A former assistant coach has been arrested for allegedly sexually abusing young boys. In a statement, the 84-year-old Paterno said, "I wish I had done more."

'This Is Only A Test;' National Alert System Gets Trial Run Today

The Emergency Alert System has never been tested all across the nation at the same time. At 2 p.m. ET it will be.

Margaret Sanger, who established Planned Parenthood, poses in 1916 outside the Brooklyn Court of Special Sessions after her arraignment for distributing information about contraceptives in New York.

How Birth Control And Abortion Became Politicized

Historian Jill Lepore writes about the early history of the birth control and abortion movements in this week's New Yorker. "I think it's easy to lose perspective [that] actually the arguments made by one side or another have switched sides over time more than once," she says.

The moon rose above Italy's finance and economy ministry in Rome on Monday.

Why Italy Is So Scary

Italy's borrowing costs spiked Wednesday, pushing the country into bailout territory. But Italy is too big to be saved by Europe's bailout fund. Although the same story has played out in other European countries, an Italian default could be catastrophic.

A group of illegal immigrants from Central America deported from the United States eat at a shelter near the Mexico-U.S. border, in Nogales, Sonora, Mexico, July 28, 2010. Last year, the U.S. deported a record number of immigrants — and the Mexican border towns where they are being released face serious problems coping with the influx.

Mexican Deportees Strain Cities South Of The Border

The U.S. deported a record number of illegal immigrants last year. Many were released in Mexico's dangerous border cities, which are struggling to provide even temporary shelter.

A section of the fusion machine being tested at General Fusion's facility outside of Vancouver, British Columbia. General Fusion is hoping to implement a long-shot strategy that could produce fusion energy in the next few years.

'Power For The Planet': Company Bets Big On Fusion

The "insanely ambitious" project aims to make power using the same process the sun uses.

Wife Deborah Bryant waits as Mississippi Governor-elect Phil Bryant thanks a supporter Tuesday at a victory party. Bryant supported a controversial amendment to the state's constitution on "personhood."

'Personhood' Divides Anti-Abortion Groups

Some foes of abortion haven't supported efforts to define legal personhood as beginning with the fertilization of a human egg because of concerns about unintended consequences.

Penn State football coach Joe Paterno was fired Wednesday by the university board. The coach is seen here during the 2002 season, several months after a graduate assistant informed him of seeing alleged sexual abuse in a locker room shower.

Case Shatters Penn State's 'Happy Valley' Image

Some experts see parallels to the sexual abuse scandal that rocked the Catholic Church. "Sometimes it's very difficult for individuals in power to accept that a person they may know personally, or as part of the faculty or church, could be committing these very serious crimes," one psychologist said.

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