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Clues to a Very Old Extinction and Why Calicos Look That Way Science and health news from the past week, including a mass extinction 252 million years ago, vaccines and pizzas that don’t spoil and clues to a cat’s signature coat. DOUGLAS QUENQUA February 25, 2014 at 5:00AM http://nyti.ms/OuVys0 http://nyti.ms/1eqFbBt The New York Times Science Archaeology, Vaccination and Immunization, United States Defense and Military Forces, Global Warming