The town of Nitro has its beginnings in 1917, when the U.S. government created it as a place to locate a munitions plant. Jeff Brady/NPR hide caption

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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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