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New research suggests the biggest animals run out of fuel for their fast-twitch muscles before they reach the maximum speed their bodies could achieve. Animals like cheetahs are born to run fast.

The Kenyan government has made long-sought changes in its top security officials after more than 30 people were killed by Al Shabab militants on Tuesday. But it's unclear whether the government can get a handle on widespread security threats.

Two years ago, President Dilma Rousseff canceled a planned state visit after discovering the U.S. was spying on Brazil. Since that time, her popularity has nosedived, and so too has Brazil's economy.

The symbol of violent white racism was found in Bubba Wallace's stall. The only Black driver in the top stock car racing circuit, he had led the campaign to ban Confederate flags from NASCAR events.

A top Senate panel wants documents from Blue Star Strategies, a public relations firm with ties to Burisma, a Ukrainian energy company whose board Hunter Biden once served on.

Elaine Chao, wife of Senate Majority Leader Mitch McConnell, was President George W. Bush's labor secretary and served in top transportation jobs in the first Bush and Reagan administrations.

The California Democrat got 134 votes to Ohio Rep. Tim Ryan's 63, but it was the most serious challenge to her leadership she has faced since taking over the top slot in the House in 2003.

The Republican candidate for governor has now spent more than $5 million of his own money to try to win the seat as Montana’s top executive. Greg...

The Kenyan took the lead with about two miles to go and never looked back. All three Americans finished in the top 10, but they failed to make the medal podium.

Being the top U.S. diplomat means a lot of global travel — roughly a million miles and 100 countries these days. Yet Kerry is the first to see Antarctica and all seven continents.