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The president made the case on The Tonight Show that the U.S. led from the front, protected Libyan civilians and helped topple the Gadhafi regime without the loss of a single American soldier and at relatively little cost.

Police broke up the protesters' camps early Tuesday. Later in the day, there were some clashes. Protesters say they'll try to set up again later today.

The pace is still down slightly from a year ago.

Yearly chest X-rays to look for lung cancer aren't worth doing because they don't save lives, according to a federally funded study. More than 150,000 people took part in the research.

The drug violence in Mexico has claimed another victim, the port city of Veracruz. The recent bloodshed is crippling tourism and sowing fear in what, until last year, had been a relatively peaceful part of Mexico. But in a twist, a group calling itself the Zeta Killers is vowing to fight the drug cartel.

Confused about the fuss over PSA screening for prostate cancer? A commentary in the New England Journal of medicine says there's a middle ground between business-as-usual and throwing PSA tests out altogether.

Increasing U.S. coal exports to China doesn't necessarily mean global emissions will rise. As demand abroad drives up coal prices at home, it could prompt U.S. utilities to switch to cheaper and more environmentally friendly natural gas. And that might alter the politics of climate change in the U.S., an expert says.

Native Americans like Dwayne Stenstrom, who were sent off the reservation as young children, seek the culture and heritage they lost.

The consensus is that the agreement buys some time, but doesn't solve the continent's underlying economic problems. Still, failure to make progress could have been disastrous.

Cities are beginning to try to control the Occupy protests. This week's violence in Oakland is something they hope to avoid.