Chris Stephens, 28, who has been battling depression all of his life, plays with his dogs at home in Concord, Calif., on Friday. After a dose of ketamine, Stephens says, "I actually wanted to do things. I wanted to live life." Lianne Milton for NPR hide caption

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'I Wanted To Live': New Depression Drugs Offer Hope For Toughest Cases
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Ketamine has been used as an anesthetic for decades. It's also a widely popular but illegal club drug known as "Special K." When administered in low doses, patients report a rapid reduction in depression symptoms. Huw Golledge/flickr hide caption

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Could A Club Drug Offer 'Almost Immediate' Relief From Depression?
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Even in the remote Faroe Islands, some children have high levels of perfluorinated compounds in their blood. The chemicals may interfere with the immune system. Stig Nygaard/Flickr hide caption

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Common Chemicals Could Make Kids' Vaccines Less Effective
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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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Debunked Science: Studies Take Heat In 2011
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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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Myth Busting: The Truth About Animals And Tools
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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

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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

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Why Brain Injuries Are More Common In Preemies
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Steinman Dies Days Before Receiving Nobel Prize
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3 Scientists Win Nobel For Immune System Studies
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Red wine's rep as a fountain of youth is facing a challenge. iStockphoto.com hide caption

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What's In That Wine Glass May Not Prevent Aging After All
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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

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How A Clever Virus Kills A Very Hungry Caterpillar
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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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Human Brain Responds To Animals, Cute Or Creepy
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