A worker stands on top of a storage bin on July 27, 2011, at a drilling operation in Claysville, Pa. The dust is from powder mixed with water for hydraulic fracturing. Keith Srakocic/AP hide caption

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Sand From Fracking Could Pose Lung Disease Risk To Workers

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NASA Says Ancient Mars Could Have Supported Life

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Space tourist Dennis Tito celebrates after his landing near the Kazakh town of Arkalyk on May 6, 2001. Alexander Nemenov/AFP/Getty Images hide caption

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First Space Tourist Sets Sights On A Mars Mission

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Health officials around the world are on constant lookout for the deadly bird flu. Here a worker collects chickens on a farm in Kathamndu, Nepal, where the virus was suspected of infecting poultry last October. Prakas Mathema/AFP/Getty Images hide caption

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Feds Set New Rules For Controversial Bird Flu Research

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Highly Anticipated Asteroid Upstaged, By A Meteor

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This computer image from a NASA video shows the small asteroid 2012 DA14 on its path as it passes by Earth on Feb. 15. NASA hide caption

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Close Shave: Asteroid To Buzz Earth Next Week

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A worker makes a cut in the side of a sandstone block at the Cleveland Quarries facility in Vermilion, Ohio, earlier this month. The legal limit on the amount of silica that workers can inhale was set decades ago. Ty Wright/Bloomberg via Getty Images hide caption

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Silica Rule Changes Delayed While Workers Face Health Risks

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Health workers in Nepal culled chickens and destroyed eggs following an outbreak of bird flu in Kathmandu in October 2012. Prakash Mathema/AFP/Getty Images hide caption

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Scientists Put An End To Moratorium On Bird Flu Research

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Two chimps groom each other at the Save the Chimps facility in Florida. The National Institutes of Health owns about 360 chimpanzees that aren't yet retired and that are living at research facilities; new guidelines say most of its chimps should be retired. Save the Chimps hide caption

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Rules Would Retire Most Research Chimps

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Hannah and Marty eat watermelon snacks at the Save the Chimps sanctuary. Save the Chimps hide caption

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Figuring How To Pay For (Chimp) Retirement

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iStockphoto.com

You Can't See It, But You'll Be A Different Person In 10 Years

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Researchers at the U.S. Geological Survey National Wildlife Health Center in Madison, Wis., use eggs to see if the Asian strain of the H5N1 bird flu virus has entered the U.S. in this photo from 2006. Andy Manis/AP hide caption

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Research Moratoriums And Recipes For Superbugs: Bird Flu In 2012

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A health official culls chickens on a poultry farm in a village on the outskirts of Katmandu, Nepal. Chickens suspected of being infected with H5N1 bird flu were found in the area in October. Prakash Mathema/AFP/Getty Images hide caption

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A prefectural officer carries a chicken on a poultry farm on Oct. 15 on the outskirts of Kathmandu, Nepal, where chickens suspected of being infected with bird flu were found. Prakash Mathema /AFP/Getty Images hide caption

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NIH Revisits Debate On Controversial Bird Flu Research

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The Mariner 2 probe at an assembly facility in Cape Canaveral, Fla., on Aug. 29, 1962. NASA/JPL/Caltech hide caption

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50 Years After First Interplanetary Probe, NASA Looks To Future

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