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Associated Press
FILE - In this April 28, 2009 file photo, Carl Djerassi poses for a portrait at Jacobs University in Bremen, Germany. Djerassi, the chemist widely considered the father of the birth control pill, has died of complications of cancer in his San Francisco home, Stanford University spokesman Dan Stober said. He was 91. Djerassi, a professor emeritus of chemistry at Stanford, was most famous for leading a research team in Mexico City that in 1951 developed norethindrone, a synthetic molecule that became a key component of the first birth control pill. "The pill" as it came to be known radically transformed sexual practices and women's lives. (AP Photo/Joerg Sarbach, File)

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