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In the last 24 hours, updated hourly

Worth a little pain? Back in 1990, a school boy got a measles shot in the U.K., and it turns out, he got more than protection against the measles. Photofusion/UIG via Getty Images hide caption

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Photofusion/UIG via Getty Images

Scientists Crack A 50-Year-Old Mystery About The Measles Vaccine

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Gen. John F. Campbell, the top U.S. commander in Afghanistan, speaks during a ceremony in Kabul on Aug. 26. Campbell is overseeing the U.S. drawdown in the country after 13 years of war. Massoud Hossaini/AP hide caption

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Massoud Hossaini/AP

Afghanistan's Way Forward: A Talk With Gen. John Campbell, Decoded

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A drawing depicts the death of St. Valentine — one of them, anyway. The Romans executed two men by that name on Feb. 14 of different years in the 3rd century A.D. Hulton Archive/Getty Images hide caption

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