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Sens. Ron Wyden (D-OR) and Mark Udall (D-CO) say the Justice Department is essentially using secret law when it comes Patriot Act, and in the long-run that could undermine the public's confidence in the intelligence community.

Diplomats from the U.S. and many other nations have walked out of the United Nations General Assembly as the Iranian president runs through a long list of what he says are crimes committed by other nations. The U.S. calls his comments "despicable."

In Africa, some ranchers shoot wildlife to keep them from eating the grass out from under their cattle. But it turns out some wildlife, like zebra, actually help cattle graze — by clearing fibrous grass stalks away and promoting the new shoot growth that cows crave.

He's a national hero because he somehow survived for 36 days in the rubble of a home after a devastating earthquake in 2008. Now six cloned piglets will carry on his legend.

Chronic fatigue syndrome is by all accounts a difficult illness – there's no known cause and consequently no test to detect it. Though a series of recent studies have shown there's no link with the XMRV virus, some advocates insist more research on it is needed.

At one point during trading, the Dow Jones and the S&P were down close to 4 percent.

The board said at a "critical moment," the company needed "renewed leadership."

More cities nationwide are investing in ways bikes and pedestrians can share the road with cars. Still, the projects have been slow to catch on in other places, most notably in Congress, where some lawmakers feel these and other "transportation enhancements" are not an appropriate use of federal dollars.

To make the point that America's infrastructure is in need of repair and the federal government should do it, President Obama traveled to the Brent Spence Bridge. It runs over the Ohio River, and it connects House Speaker John Boehner's Ohio to Senate Minority Leader Mitch McConnell's Kentucky. Melissa Block talks to NPR's Ari Shapiro for more.

For Alexander, a former Tennessee governor and two-time presidential candidate whose checkered shirts and pickup truck on the campaign trail failed to gain him the White House, his exit from the Senate GOP's leadership was more about gaining freedom, he said.