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President Obama has said he will veto the Keystone XL pipeline project, which passed in the Senate on Wednesday. Historically, political scientists say 90 percent of veto threats are issued behind the scenes but Obama has issued nine veto threats so far — in public. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

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Augustine Goba (right) heads the laboratory at Kenema Government Hospital in Sierra Leone. He and colleagues analyzed the viral genetics in blood samples from 78 Ebola patients early in the epidemic. Stephen Gire/AP hide caption

itoggle caption Stephen Gire/AP
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