Veterinarian Linda A. Detwiler helps to ensure that a fatal brain disease that can afflict humans doesn't appear in U.S. cattle. It can be a thankless task
Philip Yam is the managing editor of ScientificAmerican.com, responsible for the overall news content online. He began working at the magazine in 1989, first as a copyeditor and then as a features editor specializing in physics. He is the author of The Pathological Protein: Mad Cow, Chronic Wasting and Other Prion Diseases. Follow Philip Yam on Twitter
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