Volunteers help roll up a giant banner printed with the Preamble to the United States Constitution during a demonstration against the Supreme Court's Citizens United ruling at the Lincoln Memorial on the National Mall October 20, 2010 in Washington, DC. Chip Somodevilla/Getty Images hide caption

Ramtin Arablouei
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Thom Yorke, the singer of the British band Radiohead performs on the stage of the "Rock en Seine" music festival in 2006. STEPHANE DE SAKUTIN/AFP via Getty Images hide caption
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Brothers Ricardo Flores Magón and Enrique Flores Magón at Los Angeles Federal Court after being arrested on federal charges for their political activities. UCLA Charles E. Young Research Library Department of Special Collections hide caption
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From 2011, at an Occupy DC protest in Washington. A man holds a sign and a ball and chain, representing his college loan debt. (AP Photo/Jacquelyn Martin) Jacquelyn Martin/ASSOCIATED PRESS hide caption
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What is the Bechdel test? A shorthand for measuring representation in movies
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MC Sha-Rock. Amanda Howell Whitehurst/Amanda Howell Whitehurst for NPR hide caption
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'Throughline' examines artificial intelligence — and these days AI is everywhere
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The Three Mile Island nuclear power plant two days after a meltdown forced a temporary closure of the plant. Bettmann/Bettmann Archive hide caption