A security fence surrounds the main part of the U.S. Army's Dugway Proving Ground, a testing laboratory in the Utah desert. The Army says it mistakenly shipped live anthrax from Dugway to several labs in the U.S. and Korea. George Frey/Getty Images hide caption

itoggle caption George Frey/Getty Images

A team of scientists say they've discovered evidence of a 435,000 year old murder, based on evidence from the injuries on this skull. Javier Trueba/Madrid Scientific Films hide caption

itoggle caption Javier Trueba/Madrid Scientific Films

Tuesday's decision by the U.S. Supreme Court to not review an ordinance passed by Alameda County, California, means that drug makers will now need to pay for collection and disposal of unused drugs in the county. iStockphoto hide caption

itoggle caption iStockphoto

Patients receive treatment at the Chest Disease Hospital in Srinagar, India. The country has one of the highest rates of drug-resistant tuberculosis in the world, in part because antibiotics for the disease are poorly regulated by the government. Dar Yasin/AP hide caption

itoggle caption Dar Yasin/AP

One of these things is not like the other: A 3-D printed model of a beige cowbird egg stands out from its robin's egg nest mates, though their shape and heft are similar. Ana Lopez/Courtesy of Mark Hauber hide caption

itoggle caption Ana Lopez/Courtesy of Mark Hauber

The Speck air quality monitor costs $200, but is available to all through Pittsburgh's public library system. Carnegie Mellon University CREATE Lab hide caption

itoggle caption Carnegie Mellon University CREATE Lab