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

A stripe of red dots shows the risk corridor for a hypothetical asteroid strike, part of an exercise this week held by planetary defense experts in which they analyze data about a fictitious asteroid. Landsat/Copernicus/Google Earth/Dept. of State Geographer hide caption

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Landsat/Copernicus/Google Earth/Dept. of State Geographer

This Week, NASA Is Pretending An Asteroid Is On Its Way To Smack The Earth

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The image on the left shows the brains of pigs that were untreated for 10 hours after death, with neurons appearing as green, astrocytes as red and cell nuclei as blue. The image on the right shows cells in the same area of brains that, four hours after death, were hooked up to a system that the Yale University researchers call BrainEx. Stefano G. Daniele and Zvonimir Vrselja, Sestan Laboratory, Yale School of Medicine hide caption

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Stefano G. Daniele and Zvonimir Vrselja, Sestan Laboratory, Yale School of Medicine

Scientists Restore Some Function In The Brains Of Dead Pigs

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Scientists Have Taken The First Photo Of Something That's Invisible — A Black Hole

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Scientist Corey Gray and his mother, Sharon Yellowfly, are pictured at one of the two massive detectors that make up the Laser Interferometer Gravitational-Wave Observatory. One facility, where Gray works, is in Washington state, and the other is in Louisiana. Courtesy of Russell Barber hide caption

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Courtesy of Russell Barber

How A Cosmic Collision Sparked A Native American Translator's Labor Of Love

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The Salt Institute spent decades questioning government efforts to limit Americans' sodium intake. Critics say the institute muddied the links between salt and health. Now it has shut its doors. ATU Images/Getty Images hide caption

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ATU Images/Getty Images

After A Century, A Voice For The U.S. Salt Industry Goes Quiet

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Female mosquitoes searching for a meal of blood detect people partly by using a special olfactory receptor to home in on our sweat. Luis Robayo/AFP/Getty Images hide caption

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Luis Robayo/AFP/Getty Images

How Mosquitoes Sniff Out Human Sweat To Find Us

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How The First All-Female Spacewalk Could Be Foiled By A Spacesuit

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The Laser Interferometer Gravitational-Wave Observatory is made up of two detectors, this one in Livingston, La., and one near Hanford, Wash. The detectors use giant arms in the shape of an "L" to measure tiny ripples in the fabric of the universe. Caltech/MIT/LIGO Lab hide caption

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Caltech/MIT/LIGO Lab

Massive U.S. Machines That Hunt For Ripples In Space-Time Just Got An Upgrade

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In this illustration, SpaceX's Crew Dragon approaches the International Space Station for docking. The capsule has room to carry seven astronauts. SpaceX/NASA hide caption

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SpaceX/NASA

SpaceX Readies For Key Test Of Capsule Built To Carry Astronauts Into Space

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Astronaut Buzz Aldrin walks on the moon during the Apollo 11 mission in 1969. The landing site at Tranquility Base has remained mostly untouched — though that could change as more nations and even commercial companies start to explore the moon. NASA hide caption

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NASA

How Do You Preserve History On The Moon?

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William Lovelace/Getty Images

The Power Of Martin Luther King Jr.'s Anger

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A white-tailed deer keeps its ears open while grazing in South Hero, Vt. Rob Swanson/AP hide caption

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Rob Swanson/AP

Hungry Deer May Be Changing How Things Sound In The Forest

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Ariel Davis for NPR

If You're Often Angry Or Irritable, You May Be Depressed

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A bit of lapis lazuli — a rich blue pigment — is trapped within a central tooth's dental tartar on this lower jaw of a European woman who died sometime between A.D. 997 and 1162. Christina Warinner/Science Advances hide caption

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Christina Warinner/Science Advances

A Blue Clue In Medieval Teeth May Bespeak A Woman's Artistry Circa A.D. 1000

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