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Ecologist, author, and cancer survivor Sandra Steingraber is an internationally recognized expert on the environmental links to cancer and reproductive health. Formerly on faculty at Cornell University, she is currently Distinguished Visiting Scholar at Ithaca College in Ithaca, N.Y., and is the author of Living Downstream: An Ecologist Looks at Cancer and the Environment and Having Faith: An Ecologist's Journey to Motherhood.
Editor’s note: The following is an excerpt from “The Falling Age of Puberty in U.S. Girls: What We Know, What We Need to Know,” written …