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Federal Reserve Board Chairwoman Janet Yellen testifies before the Senate Banking, Housing and Urban Affairs Committee February 14, 2017 in Washington, DC. (Win McNamee/Getty Images)

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Screenshot of Middlebury College protest against author Charles Murray, March 2, 2017. (VTDigger Video/YouTube Screenshot)

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(Martin Barraud/Getty Images)

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Egyptian Christians, who took shelter at Saint Anthony church due to violent events in the Sinai Peninsula, carry their belongings in Zaafarana, Egypt on February 26, 2017. (Ibrahim Ramadan/Anadolu Agency/Getty Images)

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Activists gather outside Sen. Michael Bennet's office in Denver to oppose President Trump's nominee for EPA Administrator, Oklahoma Attorney General Scott Pruitt, January 23, 2017. (RJ Sangosti/The Denver Post via Getty Images)

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A US B-52 Stratofortress (R) is escorted by a South Korean F-15K fighter jet (L) as it flies over the Osan Air Base in Pyeongtaek, south of Seoul, on January 10, 2016. (JUNG YEON-JE/AFP/Getty Images)