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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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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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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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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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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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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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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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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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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Former Commando Turns Conservationist To Save Elephants Of Dzanga Bai

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A female forest elephant charges, in Dzanga-Sangha Special Reserve in the Central African Republic. Michael K. Nichols/National Geographic/Getty Images hide caption

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Civil War Invades An Elephant Sanctuary: One Researcher's Escape

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Pat Leiggi (right) of the Museum of the Rockies prepares to move a leg bone of the T. rex at the Smithsonian's Natural History Museum in Washington, D.C., on Tuesday. Maggie Starbard/NPR hide caption

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A T. Rex Treks To Washington For A Shot At Fame

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Methane-Producing Microbes Caused 'The Great Dying'

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Courtesy of Bob Walters

The 500-Pound 'Chicken From Hell' Likely Ate Whatever It Wanted

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