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Cuban migrants have received preferential treatment for more than a half-century. But as the U.S. and Cuba normalize relations, that policy could change and Cubans are racing to reach U.S. shores.

China's Communist Party will aim to tighten party discipline at a key meeting this week. Part of this is an effort to target covert factions within the party that threaten to destabilize it.

Some in the crowd expressed anger over his endorsement of Donald Trump, who kicked off his presidential campaign last year by disparaging Mexican immigrants.

From the thickness of tooth enamel to the molecular signatures on a tooth left behind by foods eaten by a human, fossil teeth hold many clues to the diets of our ancestors.

The pope urged President Nicolas Maduro to "alleviate the suffering of the people" amid Venezuela's economic and political disaster. The Vatican will mediate between the government and the opposition.

A new study finds that for every seven more adults in a neighborhood, one fewer young person leaves school.

Researchers say the ice is melting more quickly than they've ever seen. They think it's because warm water is circulating under the ice shelf, and that the melting process appears to be irreversible.

Rick Hasen, founder of the Election Law Blog, discusses Donald Trump's claims of potential voter fraud. "He's threatening the bedrock of democracy, and doing it to claim he's not a loser," Hasen says.

A Pew Research Center survey says most Americans on social media are stressed out by online political interactions — and those feelings appear to be bipartisan.

Fifty patients with Lou Gehrig's disease have volunteered for a study of a dietary supplement as an experimental treatment. Even a failure could help by eliminating a dead end from consideration.