Researchers claimed in late 2010 that they found bacteria in Mono Lake, Calif., that survived on the poison arsenic in the place of an element thought essential to life. The report was immediately greeted with skepticism from the scientific community. Ben Margot/AP hide caption

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A tufted capuchin uses a stone hammer to crack open a nut in Brazil's Parnaiba Headwaters National Park. Ben Cranke/Getty Images hide caption

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A Harvard study found dramatically higher BPA exposure in people who ate canned soup. The researchers used different varieties of Progresso-brand vegetable soups, but BPA is found in the epoxy resins used to coat the inside of many food and beverage cans. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

The most common cause of brain injury in premature infants is a lack of oxygen in the days and weeks after birth, researchers say. Ibrahim Usta/AP hide caption

itoggle caption Ibrahim Usta/AP

A healthy gypsy moth caterpillar on a leaf. Outbreaks of gypsy moths damage roughly 1 million acres of forest in the U.S. each year. Michael Grove/Science/AAAS hide caption

itoggle caption Michael Grove/Science/AAAS

The brain "seems to be specialized in alerting us to things that are emotionally important to us — either positive or because they're scary," a scientist says. iStockphoto.com hide caption

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A convoy of Walmart trucks waited to enter New Orleans on Sept. 1, 2005, after the city was battered by Hurricane Katrina. Government agencies said the massive storm taught them that big-box retailers need to be an integral part of hurricane preparation and relief efforts. Nicholas Kamm/AFP/Getty Images hide caption

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This image shows the above-normal water temperature in the Pacific Ocean during the December 1997 El Nino. Green-blue colors represent normal temperatures; dark red indicates hotter water. NOAA hide caption

itoggle caption NOAA

The P-3B NASA research aircraft, seen on the tarmac at Baltimore Washington International Airport on June 28, will gather data as it flies spirals over six ground stations in Maryland. Paul E. Alers/NASA hide caption

itoggle caption Paul E. Alers/NASA