Christopher Joyce Christopher Joyce is a correspondent on the science desk at NPR. His stories can be heard on all of NPR's news programs, including NPR's Morning Edition, All Things Considered, and Weekend Edition.

Obama Requests All Nations Participate In Climate Treaty

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Climate Activists Look For Solutions From Business, Diplomats

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Workers at the National Geographic Museum in Washington grind the rough edges off a life-size replica of a spinosaurus skeleton. Mike Hettwer/National Geographic hide caption

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Mike Hettwer/National Geographic

Crocodile Meets Godzilla — A Swimming Dino Bigger Than T. Rex

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"The State of the Birds" 2014 report found that red knots (above) and other shorebirds are among the most threatened groups in the U.S. More than half of U.S. shorebird species are on the report's Watch List — species that are currently endangered or at risk. Gerrit Vyn/The Smithsonian Institution hide caption

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Gerrit Vyn/The Smithsonian Institution

U.S. Gets Middling Marks On 2014 'State Of Birds' Report Card

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The granulated surface of the lake bed known as the Racetrack is a favorite destination for tourists — and for scientists who want to investigate trails left by the meandering stones. Momatiuk - Eastcott/Corbis hide caption

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Momatiuk - Eastcott/Corbis

An Icy Solution To The Mystery Of The Slithering Stones

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An earlier spring in Montana's Glacier National Park means full waterfalls at first — but much drier summers. Robert Glusic/Corbis hide caption

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Robert Glusic/Corbis

There's A Big Leak In America's Water Tower

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Louis E. Pratt, master ivory cutter for Pratt, Read & Co., shows off eight ivory tusks, April 1, 1955. Courtesy of Deep River Historical Society hide caption

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Courtesy of Deep River Historical Society

Elephant Slaughter, African Slavery And America's Pianos

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A bed of eel grass (Zostera marina) flutters in the current along the California coast. David Wrobel/Visuals Unlimite/Corbis hide caption

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David Wrobel/Visuals Unlimite/Corbis

Underwater Meadows Might Serve As Antacid For Acid Seas

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Our popular image of Homo erectus as the proto-guy who whose human-like traits all emerged at once needs overhauling, some anthropologists say. Sylvain Entressangle/Science Source hide caption

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Sylvain Entressangle/Science Source

Dance Of Human Evolution Was Herky-Jerky, Fossils Suggest

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Being a bit coldblooded has its charms, scientists say. A mammal the size of a T. rex, for example, would have to eat constantly to feed its supercharged metabolism — and would probably starve. Publiphoto/Science Source hide caption

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Publiphoto/Science Source

Maybe Dinosaurs Were A Coldblooded, Warmblooded Mix

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Hairlike sensors on the the legs of the golden silk spider help it "listen" to the thrum of its web. I'll Never Grow Up/Flickr hide caption

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I'll Never Grow Up/Flickr

Spiders Tune In To Web's Music To Size Up Meals And Mates

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Scientists Find Africa's Longest Land Migration: Zebras' 350-Mile Trek

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Clint Muhlfeld, an aquatic ecologist with the USGS, holds a native Westslope cutthroat trout in Glacier National Park. Noah Clayton/USGS hide caption

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Noah Clayton/USGS

Hybrid Trout Threaten Montana's Native Cutthroats

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Scientists Discover Carbon Cycle Is Out Of Whack

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Kalron and his team have set up video cameras that transmit real-time images of the bai via satellite. Courtesy of Maisha Consulting hide caption

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Courtesy of Maisha Consulting

Former Commando Turns Conservationist To Save Elephants Of Dzanga Bai

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