Nell Greenfieldboyce Nell Greenfieldboyce is a NPR science correspondent.
Nell Greenfieldboyce 2010
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Nell Greenfieldboyce

NASA is defending against future asteroids that could collide with earth

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After two failed attempts to launch, NASA's moon rocket may need repairs

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NASA's Space Launch System rocket with the Orion spacecraft aboard is seen atop the mobile launcher at the Kennedy Space Center in Cape Canaveral, Fla., on Saturday before the planned launch was scrubbed due to fuel leaks. NASA/Getty Images hide caption

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NASA/Getty Images

NASA delays Artemis I test flight because of engine issues

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NASA'S pricey new moon rocket — is it worth the cost?

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NASA begins countdown for its mission around the moon

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NASA plans to launch a huge moon rocket but the price tag may impede its future

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What happens to sweat in outer space (Hint: There's no gravity to help it drip away)

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Blacktail Deer Creek in Yellowstone National Park, seen here in a 2019 photo from the ecological study known as NEON, is one site where researchers have bubbled sulfur hexafluoride into the water. NEON hide caption

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NEON

Why scientists have pumped a potent greenhouse gas into streams on public lands

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As the first James Webb Space Telescope images appeared in New York's Times Square and everywhere else, scientists got to work diving deep into the data. Yuki Iwamura/AFP via Getty Images hide caption

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Yuki Iwamura/AFP via Getty Images

The James Webb Space Telescope images have been a game changer for astronomers

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Maria Fabrizio for NPR

Why this key chance to getting permanent birth control is often missed

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The new bacteria, named Thiomargarita magnifica, were discovered on sunken leaves in a Caribbean mangrove swamp. Olivier Gros/The Regents of the University of California, LBNL hide caption

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Olivier Gros/The Regents of the University of California, LBNL

Think all bacteria are microscopic? Tell that to these centimeter-long monsters

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A female bear and two 1-year-old cubs walk over snow-covered freshwater glacier ice in Southeast Greenland. Kristin Laidre hide caption

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Kristin Laidre

In a place with little sea ice, polar bears have found another way to hunt

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Demonstrators attend a candlelight vigil Wednesday in Fairfax, Va., for the victims of the Uvalde and Buffalo mass shootings. Allison Bailey/Reuters Connect hide caption

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Allison Bailey/Reuters Connect

Research shows policies that may help prevent mass shootings — and some that don't

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