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

The botulism toxin comes from Clostridium botulinum bacteria, seen here in a colorized micrograph. James Cavallini/Science Source hide caption

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James Cavallini/Science Source

Why Scientists Held Back Details On A Unique Botulinum Toxin

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The Chalet (right) is the U.S. Antarctic Program's administrations and operations center at McMurdo Station. Reed Scherer/National Science Foundation hide caption

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Reed Scherer/National Science Foundation

A helicopter is unloaded from an LC-130 in Antarctica last December. Researchers on this mission were studying the Pine Island Glacier, one of the fastest-receding glaciers on the continent. August Allen/National Science Foundation hide caption

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August Allen/National Science Foundation

Even Antarctica Feels Effects Of The Government Shutdown

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Would time spent with Anton Chekov, famed for his subtle, flawed characters, make you a better judge of human nature? Hulton Archive/Getty Images hide caption

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Hulton Archive/Getty Images

The Clinical Center at the National Institutes of Health in Bethesda, Md. National Institutes of Health hide caption

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National Institutes of Health

A worker stands on top of a storage bin on July 27, 2011, at a drilling operation in Claysville, Pa. The dust is from powder mixed with water for hydraulic fracturing. Keith Srakocic/AP hide caption

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Keith Srakocic/AP

NASA Says Ancient Mars Could Have Supported Life

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Space tourist Dennis Tito celebrates after his landing near the Kazakh town of Arkalyk on May 6, 2001. Alexander Nemenov/AFP/Getty Images hide caption

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Alexander Nemenov/AFP/Getty Images

Health officials around the world are on constant lookout for the deadly bird flu. Here a worker collects chickens on a farm in Kathamndu, Nepal, where the virus was suspected of infecting poultry last October. Prakas Mathema/AFP/Getty Images hide caption

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Prakas Mathema/AFP/Getty Images

Highly Anticipated Asteroid Upstaged, By A Meteor

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This computer image from a NASA video shows the small asteroid 2012 DA14 on its path as it passes by Earth on Feb. 15. NASA hide caption

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NASA

Close Shave: Asteroid To Buzz Earth Next Week

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A worker makes a cut in the side of a sandstone block at the Cleveland Quarries facility in Vermilion, Ohio, earlier this month. The legal limit on the amount of silica that workers can inhale was set decades ago. Ty Wright/Bloomberg via Getty Images hide caption

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Ty Wright/Bloomberg via Getty Images

Health workers in Nepal culled chickens and destroyed eggs following an outbreak of bird flu in Kathmandu in October 2012. Prakash Mathema/AFP/Getty Images hide caption

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Prakash Mathema/AFP/Getty Images

Two chimps groom each other at the Save the Chimps facility in Florida. The National Institutes of Health owns about 360 chimpanzees that aren't yet retired and that are living at research facilities; new guidelines say most of its chimps should be retired. Save the Chimps hide caption

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Save the Chimps

Hannah and Marty eat watermelon snacks at the Save the Chimps sanctuary. Save the Chimps hide caption

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Save the Chimps

Figuring How To Pay For (Chimp) Retirement

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