Controlling dust from activities like this was on the minds of those in the Department of Labor in the 1930s, as silicosis, a lung disease, was taking a toll on American workers. Above, a worker jackhammers into rock in Lassen National Forest in California in 1934, preparing to shoot explosives. U.S. Forest Service/Oregon State University Libraries hide caption

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New Silica Rules Languish In Regulatory Black Hole
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Pythons Blamed For Everglade's Disappearing Animals
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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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Nonnative pythons, like this one, are invading the Florida Everglades. As a top predator, the snakes have crippled the populations of rabbits, raccoons and other animals. Joe Raedle/Getty Images hide caption

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Invasive Pythons Put Squeeze On Everglades' Animals
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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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The Delboeuf illusion makes one dot appear larger than the other. But they're the same size. Your brain is misled by comparing the dots to the surrounding circles. Washiucho/Wikimedia Commons hide caption

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Ancient Skull Holds Clues to Dog Domestication
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Can Science Be Done Without Secrecy?
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Stem Cell Eye Therapy Shows Promise
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Ode To Ice
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