Nell Greenfieldboyce Nell Greenfieldboyce is a NPR science correspondent.

Stacks of boxes containing critical supplies stretch almost as far as the eye can see in this Strategic National Stockpile warehouse. Courtesy of the CDC hide caption

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Courtesy of the CDC

Inside A Secret Government Warehouse Prepped For Health Catastrophes

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This view of North America as seen in Google Earth shows colored areas that denote levels of light pollution as detailed in the New World Atlas of Artificial Sky Brightness. Fabio Falchi et al./AAAS hide caption

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Fabio Falchi et al./AAAS

Light Pollution Hides Milky Way From 80 Percent Of North Americans, Atlas Shows

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A silver-haired bat, the type that transmitted rabies to a woman in Wyoming after apparently biting her while she slept. Lyn Alweis/Denver Post via Getty Images hide caption

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Lyn Alweis/Denver Post via Getty Images

Cyrtophora citricola, a type of orb-weaving spider, live in big colonies. So males potentially have a large pool of females from which to choose a mate. Buschwerk/Flickr hide caption

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Buschwerk/Flickr

She's A Man-Eater, And That's OK With Male Orb-Weaving Spiders

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Scientists say bumblebees can sense flowers' electric fields through the bees' fuzzy hairs. Jens Meyer/AP hide caption

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Jens Meyer/AP

Bumblebees' Little Hairs Can Sense Flowers' Electric Fields

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Female Drosophila bifurca flies have an organ to store sperm (right) that male flies compete to fill, crowding out rivals. Scott Pitnick/Nature hide caption

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Scott Pitnick/Nature

For Female Fruit Flies, Mr. Right Has The Biggest Sperm

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Aedes aegypti mosquito photographed through a microscope. Felipe Dana/AP hide caption

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Felipe Dana/AP

CDC: 157 Pregnant Women In The U.S. Have Tested Positive For Zika

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Every bit of steel in the car you drive has been measured as to its capability to withstand certain forces — pushing and pulling. Machines like this do the measuring. Jennifer Lauren Lee/NIST PML hide caption

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Jennifer Lauren Lee/NIST PML

How Do You Lift A Million Pounds Of Stainless Steel? Very Carefully

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These mitochondria, in red, are from the heart muscle cell of a rat. Mitochondria have been described as "the powerhouses of the cell" because they generate most of a cell's supply of chemical energy. But at least one type of complex cell doesn't need 'em, it turns out. Science Source hide caption

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Science Source

This artist's concept depicts some of the planetary discoveries made by NASA's Kepler Space Telescope. Tuesday's announcement more than doubles the number of verified planets discovered by the Kepler mission. W. Stenzel/NASA hide caption

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W. Stenzel/NASA

NASA Spots 1,284 New Planets, Including 9 That Are 'Potentially Habitable'

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This artist's rendering shows what the view might look like from one of the three planets orbiting an ultracool, reddish dwarf star just 40 light-years from Earth. ESO/M. Kornmesser/Nature hide caption

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ESO/M. Kornmesser/Nature

3 Strange Worlds Circling A Cool Star Might Be Prime Spots To Support Life

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Earlier this week, NIH temporarily halted work in the cell therapy lab of Dr. Steven Rosenberg, chief of surgery at the National Cancer Institute, pending a review of safety standards there. Courtesy of National Cancer Institute hide caption

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Courtesy of National Cancer Institute

Task Force Calls For More Safety Oversight At NIH Research Hospital

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The Clinical Center on the campus of the National Institutes of Health, in Bethesda, Md., is an internationally renowned hospital where patients are also research subjects. NIH/Flickr hide caption

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NIH/Flickr

(Top row, left to right) Titan, Earth's moon, Europa and Enceladus. (Bottom row, left to right) Callisto, Charon, Ariel and lo. NASA hide caption

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NASA

Hot On The Trail Of Alien Moons

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