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If someone touches your toe and nose at the same time, you feel it simultaneously; but really the signal from your nose reaches your brain before the signal from your toe. This could mean that short people experience things faster than tall people.

Violent protests are continuing in Greece two weeks police shot and killed a teenager. Riot police have clashed with rock-throwing demonstrators in central Athens. Christmas shoppers and people in cafes sought cover. Derek Gatopolous, a reporter for The Associated Press, offers his insight.

As many Americans struggle to pay for health care or health insurance, hospitals in Mexico are expanding in hopes of wooing more patients from north of the border. Costs for procedures are often significantly cheaper due to lower overhead in Mexico.

For pro players, this is the part of the season when teams are banged up and playing through pain. But for at least one Washington Capitals player, a good night's sleep can come only after he has put his body on the line in a game.

A report in the Journal of the American Medical Association shows that the human heart needs a certain amount of sleep every night to stay healthy. The link between sleep and heart health is stronger than researchers suspected.

As many as 60 million bison roamed the American prairie at the time Columbus sailed to the New World in 1492. By 1900, only hundreds remained. Bison have since made a comeback, but today's herds carry a flaw that could put the species at risk.

A federal appeals court in New York hears arguments Tuesday over a lawsuit filed by Maher Arar, a Canadian detained at JFK airport in 2002 and deported to Syria, where he was tortured. Arar says his goal is to hold U.S. officials responsible for violating his human rights.

A down economy usually means a bump in enrollment at colleges and universities: Applications tend to go up as job prospects go down. But in this recession, private colleges especially are finding themselves working harder to fill freshman classes.

Even as America's troubled auto industry seeks a handout from Congress, a relatively new car manufacturer that's tailored for the 21st century is trying to get traction. Tesla Motors Inc., in Silicon Valley, hopes its $110,000 Roadster will make inroads for a cheaper family sedan.

The Manhattan Project to build an atomic bomb was one of the U.S. government's biggest secrets. At the same time, its scientists and engineers were furiously filing patent applications, which held the potential to reveal exquisite details about the bomb.