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President Donald Trump has added economic sanctions to his fiery military threats against North Korea, and renewed his rhetorical offensive against Kim Jong Un on Friday, calling the reclusive leader "obviously a madman."

In a referendum scheduled for Monday, Kurds are expected to vote in favor of separating from Iraq. International opposition to the referendum is overwhelming.

Researchers have won a prize for discovering that a cow's genetics determine which microbes populate its gut. Some of those microbes produce the greenhouse gas methane that ends up in the atmosphere.

Burns says he and co-director Lynn Novick initially thought they understood the Vietnam War. But when they started putting together their new PBS series, they realized, "We knew nothing."

Girls are vulnerable, boys are strong. It's a dichotomy that researchers observed in 15 countries around the world — and one that has big consequences for children's health and success.

Chancellor Angela Merkel looks set to return for a fourth term as Germans head to the polls Sunday. But who her coalition partners will be, and how influential a far-right party will be, are unclear.

Russia has been less aggressive in Germany's election than it was in the U.S. or France. Chancellor Angela Merkel remains favored — but the Kremlin still could leave its mark.

Marla Leaf says she wasn't speeding, but a speed camera says she was. She argues her rights were violated because Cedar Rapids delegated police powers to the private company maintaining the cameras.

The members of the winning team, who met at Rutgers University, piloted a transportation service aimed at the refugees in the world's largest slum.

Annalee Newitz's tale of a pharmaceutical pirate and the dangerous agents hunting her is built on tender, intimate characterizations that probe notions of selfhood, gender and ownership.