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Novichok-class agents were developed in top-secret Russian labs at the end of the Cold War. Experts say only Russia is known to have made them. "They've been a deep, dark secret," says one expert.

Many spiders ply the skies by riding "balloons" of silk. And they rely on something more than just the wind to take them high up and far away.

"It's supposed to be hard," Linden told reporters after the race, slowed down by rain and near-gale headwinds. U.S. women claimed seven of the top eight spots in the race.

The comments from Beijing came just hours after President Trump threatened to hit Chinese exports with $100 billion in new tariffs — that's on top of the $50 billion he's already promised.

The storm system has prompted tornado and flash flood warnings, and officials are keeping a close watch on New Orleans' levee system and infrastructure, which failed during Hurricane Katrina in 2005.

See which 2020 presidential candidate has raised the most money, who has spent the most, where a candidate's funding comes from — and how the Democrats stack up against President Trump.

The verdict is the first to be handed down against the top Khmer Rouge leadership. As many as 2 million people died in the regime's "killing fields." The two men will serve life in prison.

In a monthly Gallup poll of American attitudes, dissatisfaction with the political leadership topped all other issues among Democrats, Republicans and Independents. But dissatisfaction with the government was down from a peak of 33 percent last October.

Doctors and patients are trying to balance the need for pain relief and the potential for trouble. In an NPR poll, addiction and side effects were the top concerns.

Would a salad arranged like an abstract painting be more enjoyable and valuable to diners than a typical salad presentation? Psychologists tried to find out.