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

An artist's impression of NASA's New Horizons spacecraft encountering Ultima Thule, a Kuiper Belt object that orbits 1 billion miles (1.6 billion kilometers) beyond Pluto, on Jan. 1, 2019. JPL/NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Steve Gribben hide caption

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JPL/NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Steve Gribben

Way Beyond Pluto, An Icy World Is Ready For Its Close-Up

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2018: A Big Year In Space

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Drosophila melanogaster, the common fruit fly, is a mainstay of genetics and biology labs. Courtesy of Marcus Stensmyr hide caption

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Courtesy of Marcus Stensmyr

When And Where Fruit Flies First Bugged Humans

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Neil deGrasse Tyson said of the allegations: "But what happens when it's just one person's word against another's, and the stories don't agree? That's when people tend to pass judgment on who is more credible than whom." Santiago Felipe/Getty Images hide caption

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Santiago Felipe/Getty Images

Forged in 1879 and sanctioned by the General Conference on Weights and Measures at its first meeting, Le Grand K, the international prototype of the kilogram, has been kept under lock and key in a vault outside Paris. BIPM hide caption

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BIPM

Say Au Revoir To That Hunk Of Metal In France That Has Defined The Kilogram

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Arrangement of colored oviraptor-like eggs in an oviraptorid nest arrangement Jasmina Wiemann/Yale University hide caption

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Jasmina Wiemann/Yale University

Birds Got Their Colorful, Speckled Eggs From Dinosaurs

A new study found that birds' dinosaur relatives had eggs with traces of two pigments—a red-brown one and a blue-green one. In today's birds that might produce a color such as robin's egg blue.

Birds Got Their Colorful, Speckled Eggs From Dinosaurs

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A new analysis of what were initially thought to be microbial fossils in Greenland suggests they might instead just be mineral structures created when ancient tectonic forces squeezed stone. While most of the structures point in one direction, the red arrow shows that some point in the other direction. Courtesy of Abigail Allwood hide caption

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Courtesy of Abigail Allwood

Geologists Question 'Evidence Of Ancient Life' In 3.7 Billion-Year-Old Rocks

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Smoke rises as first-stage boosters separate from a Soyuz rocket with a Soyuz MS-10 spacecraft carrying a NASA astronaut and a Russian cosmonaut. The mission was aborted shortly after launch, and the pair returned to Earth safely in an emergency landing. Dmitri Lovetsky/AP hide caption

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Dmitri Lovetsky/AP

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

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Courtesty of NASA

Scientists Find What Could Be A History-Making Moon

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Biochemical engineer Frances Arnold receives the Millennium Technology Prize 2016 during the awards ceremony in Helsinki, Finland. Arnold, an American, shares this year's Nobel Prize in Chemistry with two others, another American, George P. Smith and the U.K.'s Sir Gregory P Winter. Heikki Saukkomaa/Lehtikuva via AP hide caption

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Heikki Saukkomaa/Lehtikuva via AP

Winners Of Nobel Prize In Chemistry Announced In Stockholm

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Friend or foe? A California two-spot octopus (Octopus bimaculoides) gives observers the eye at the Marine Biological Laboratory in Woods Hole, Mass. Tom Kleindinst/Marine Biological Laboratory hide caption

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Tom Kleindinst/Marine Biological Laboratory

Octopuses Get Strangely Cuddly On The Mood Drug Ecstasy

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A 17-year-old male bonobo eats while his son watches in the Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. Fiona Rogers/Getty Images hide caption

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Fiona Rogers/Getty Images

What's Mine Is Yours, Sort Of: Bonobos And The Tricky Evolutionary Roots Of Sharing

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