More than 100 years ago, Golgi staining on nerve cells opened the gates to modern neuroscience. Scientists recently developed the Technicolor version of Golgi staining, Brainbow, allowing more detailed reconstructions of brain circuits. AFP/Getty Images hide caption

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Officers stand by in 1955 as religious leaders from Chicago demonstrate outside the White House in Washington over the murder of 14-year-old Emmett Till. AP hide caption

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Joy Reynolds of San Diego looks at the newspapers on display at the Newseum in Washington, D.C., on June 29, 2012, following the Supreme Court ruling on President Obama's health care law. David Goldman/AP hide caption

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A still from the video for E-40's 1993 song "Practice Looking Hard," in which rappers like The Coup's Boots Riley (second from right) and Tupac (not pictured) also appeared. Couresy of Zomba Recording hide caption

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This artist rendering shows Paul Clement (second from left) with Solicitor General Donald B. Verrilli Jr. (seated, right), addressing the Supreme Court on Wednesday. Justices pictured are (from left) Sonia Sotomayor, Stephen Breyer, Clarence Thomas, Antonin Scalia, Chief Justice John Roberts, Anthony Kennedy, Ruth Bader Ginsburg, Samuel Alito and Elena Kagan. Dana Verkouteren/AP hide caption

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People file into the Supreme Court on Tuesday for the court's hearing on California's Proposition 8, a voter-approved ban on same-sex marriage. Pablo Martinez Monsivais/AP hide caption

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Ellen DeGeneres during a taping of The Ellen DeGeneres Show in 2011 in Burbank, Calif. Michael Rozman/Warner Bros./AP hide caption

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In Wyoming, a gun is used in about three-quarters of all suicides. Nationally, guns are used about 50 percent of the time. Spencer Platt/Getty Images hide caption

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Supreme Court justices will hear arguments Tuesday on California's Proposition 8 ban on same-sex marriage. On Wednesday they'll hear arguments on the federal Defense of Marriage Act, which defines marriage as between one man and one woman. Nicholas Kamm/AFP/Getty Images hide caption

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Sen. Barbara Mikulski, D-Md., speaks at the Democratic National Convention last year in Charlotte, N.C. She's the first woman ever to chair the Senate Appropriations Committee. Alex Wong/Getty Images hide caption

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Edith Windsor in her New York City apartment in December 2012. Next week, the U.S. Supreme Court hears her challenge to the 1996 Defense of Marriage Act. Richard Drew/AP hide caption

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Jamie Livingston was sexually abused while serving in the Navy. She now lives in El Paso, Texas. David Gilkey/NPR hide caption

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Gustave Whitehead and the No. 21. Connecticut claims that Whitehead's half-mile flight in 1901 was the first flight, not the well-known Wright brothers' flight that occurred two years later. Courtesy Deutsches Flugpioniermuseum Gustav Weisskopf Leutershausen/Historical Flight Research Committee Gustave Whitehead hide caption

itoggle caption Courtesy Deutsches Flugpioniermuseum Gustav Weisskopf Leutershausen/Historical Flight Research Committee Gustave Whitehead

Led by the Rev. Willie Phillips (center), protesters march in February against violence in and around Club Majestic. Mike Haskey/Courtesy of The Ledger Enquirer hide caption

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