Fear The Prius? A Toyota Prius hybrid model car waits for customers at a Toyota dealer in Hollywood, Calif., on March 10. Concerns about the cars suddenly accelerating dogged the company earlier this year. Mark Ralston/AFP/Getty Images hide caption

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Residents of Times Beach, Mo., were forced to leave their town in December 1982 because the chemical dioxin was found in the soil. Thirty years later, the Environmental Protection Agency can't decide how dangerous the chemical is. Bill Pierce/Time & Life Pictures/Getty Images hide caption

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Mono Lake, Calif., is home to a bacterium discovered by NASA scientists that can eat and grow on arsenic instead of phosphorous, one of the basic building blocks of life. The finding has implications for NASA's ongoing search for signs of life elsewhere in the universe. David McNew/Getty Images hide caption

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Eggs of the parasite called the human whipworm, responsible for Trichuriasis, a disease that affects the large intestine and causes gastrointestinal problems. Drug companies are now trying to create parasites for treating inflammatory bowel disease. Public Health Image Library/CDC hide caption

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Our brains have chemical pathways that make us feel good when we eat, and really good when we eat sweet or fatty foods with high calories. Scientists see these same chemical pathways used in cases of drug addiction. Paul Ellis/AFP/Getty Images hide caption

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Songbirds, like this male tricolored blackbird, develop regional accents in the same way humans do, researchers found. And, like humans, songbirds seem to respond better to accents they already know. Dave Menke/Courtesy of the U.S. Fish and Wildlife Service hide caption

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The locals of Beatty, Nev., brought back the Amargosa toad from near extinction and kept the species off the endangered species list. U.S. Fish and Wildlife Service hide caption

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The Food and Drug Administration has approved Nuedexta to treat a condition known as emotional incontinence. Courtesy of Avanir hide caption

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A clinical psychologist in Connecticut monitors the electrode impulses of a patient with ADHD. Some parents are turning to neurofeedback to treat the disorder. Catherine Avalone/The Middletown Press hide caption

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Children await treatment at a medical facility in St. Marc, northern Haiti, amid a cholera epidemic that has claimed more than 100 lives and infected more than 1,000 people over the past few days. Thony Belizaire/AFP/Getty Images hide caption

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