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

itoggle caption Lianne Milton for NPR

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

itoggle caption Huw Golledge/flickr

Since 1990, glasses-wearing Navy recruits have been required to wear their standard-issue S9 eyeglasses through training. Scott Olson/Getty Images hide caption

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Activists on both sides of the abortion issue attend a vigil outside the U.S. Supreme Court on Jan. 23. The vigil was held to mark the anniversary of the Roe v. Wade Supreme Court decision that legalized abortion. Anti-abortion groups plan to push several bills this year that would restrict abortions. Brendan Hoffman/Getty Images hide caption

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Shannon Earle holds her new baby Kiera Breen Earle, moments after she was born at their home last year. Amanda Steen/NPR hide caption

itoggle caption Amanda Steen/NPR

Protesters against new regulations limiting abortion rights rally outside the Statehouse in Topeka, Kan., last Sept. Orlin Wagner/AP hide caption

itoggle caption Orlin Wagner/AP