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Tiny plastic debris — some so small you can't see it — has previously been found in human blood, excrement and in the depths of the ocean.

The agency is accepting applicants for the second cohort of its Mars simulator mission. Participants will live and work from a 3D-printed, 1,700-square-foot facility at NASA's Houston space center.

Sixty years ago, America began closing mental hospitals. A growing chorus is blaming that for the crisis of mentally ill folks living on our streets.

"I expect the company to deliver the 400 million doses as agreed," said European Commission President Ursula von der Leyen.

The cyclone has caused widespread damage by blowing the roofs off homes, knocking down trees and utility poles, making roads impassable and flooding many areas.

Serious algae outbreaks have hit more than 20 states this summer. Algae blooms aren't unusual. But the frequency, size and toxicity now are worse than ever, and changes in climate are partly to blame.

When scientists revved up the production of an enzyme called GPLD1 in older mice, it stimulated nerve growth in their brains and the animals navigated a maze better.

Among Native Americans, asthma rates are high, and those with asthma end up in clinics more often, miss more school and work, and are more likely to die from the condition, according to the CDC.

Thousands filled the streets of the Serbian capital Belgrade on Saturday to protest plans to mine one of Europe’s largest deposits of lithium. Lithium is a crucial material for electric car batteries.

The death toll in a fire that engulfed an apartment block in the Spanish city of Valencia rose Friday to nine. One person remained missing, according to forensic police.