Graduate student Jennifer Klunk of McMaster University examines a tooth used to decode the genome of the ancient plague. Courtesy of McMaster University hide caption

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Ancient Plague's DNA Revived From A 1,500-Year-Old Tooth

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The eastern Grand Canyon was about half-carved (to the level of the red cliffs above the hiker) from 15 million to 25 million years ago, an analysis published Sunday suggests. But the inner gorge was likely scooped out by the Colorado River in just the past 6 million years. Laura Crossey/University of New Mexico hide caption

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Grand Canyon May Be Older (And Younger) Than You Think

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Computer networks and GPS systems are only possible because of the precision timekeeping of atomic clocks like the one above, says clockmaker and physicist Jun Ye. Ye Group and Baxley/JILA hide caption

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Tickety-Tock! An Even More Accurate Atomic Clock

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Kepler-22b, seen in this artist's rendering, is a planet a bit larger than Earth that orbits in the habitable zone of its star. Some researchers think there might be "superhabitable" worlds that may not resemble Earth. NASA/Ames/JPL-Caltech hide caption

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In Search For Habitable Planets, Why Stop At 'Earth-Like'?

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A reproduction of the mural from a room in Catalhoyuk, a Neolithic settlement in Turkey. Sarah Murray/Flickr hide caption

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There She Blew! Volcanic Evidence Of The World's First Map

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On Planet GJ1214 B, Expect Exotic Cloud Cover

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NASA/JPL-Caltech

Bon Voyage, Voyager: Old Friends Take Stock

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Vera Wojtesta was one of 300 babies flagged by New York's newborn screening program as at risk of having life-threatening Krabbe disease. Ben Shutts/Courtesy of the Wojtesta family hide caption

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Screening Newborns For Disease Can Leave Families In Limbo

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Zachary Phillips sets up the gigapixel camera at a nature reserve in Virginia. Morgan Walker/NPR hide caption

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Supercamera: More Pixels Than You Know What To Do With

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The plate on the left contains about equal numbers of colonies of two different bacteria. After the bacteria compete and evolve, the lighter ones have taken the lead in the plate on the right. Courtesy of Michael Wiser hide caption

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Bacterial Competition In Lab Shows Evolution Never Stops

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A dog burial in Greene County, Ill. This fossil dates back to about 8,500 years ago. Courtesy of Del Baston, Center for American Archaeology hide caption

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Old Dogs, New Data: Canines May Have Been Domesticated In Europe

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This is an artist's illustration of Kepler-62f, a planet in the "habitable zone" of a star that is slightly smaller and cooler than ours. Kepler-62f is roughly 40 percent larger than Earth. NASA/JPL-Caltech/T. Pyle hide caption

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Galaxy Quest: Just How Many Earth-Like Planets Are Out There?

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Friend Or Foe? Scientists say dogs react differently to the direction of another dog's tail wag. Time & Life Pictures/Getty Images hide caption

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The Tail's The Tell: Dog Wags Can Mean Friend Or Foe

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The botulism toxin comes from Clostridium botulinum bacteria, seen here in a colorized micrograph. James Cavallini/Science Source hide caption

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Why Scientists Held Back Details On A Unique Botulinum Toxin

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