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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.

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

At the close of trading, the Dow Jones industrial average was down 391.01 points, or 3.5 percent, at 10,733.83. At one point, the Dow fell 527 points. The Standard & Poor's 500 and Nasdaq composite each closed down more than 3 percent.

During a hearing Thursday on Capitol Hill, the top U.S. military officer, Adm. Mike Mullen, issued a stern warning to Pakistan over ties between that country's spy agency and groups attacking U.S. forces in Afghanistan. But it's unclear what the U.S. proposes to do in response.

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.

The nation's for-profit colleges and universities received more than $1 billion in benefits from the Post-Sept. 11 GI Bill in the last year alone. But some say the for-profit schools aren't policed well enough — which creates an opening for abuses — and their dropout rates are too high.

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.

A bioethicist says Rep. Michele Bachmann was not able to meet his challenge and produce evidence linking the HPV vaccine with mental retardation.

Some users were caught off guard by the revamped Facebook News Feed — and the changes won't stop coming.

A high level of investment in agriculture is driving up land prices, making it harder for new farmers to afford their own. And banks simply aren't lending to higher-risk first-time farmers. Unless young people are left farmland by their family, they're out of luck, one banker explains.