Janet Collins was€” the first prima ballerina to perform at the Metropolitan Opera. Ed Palumbo/Library of Congress hide caption

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Mayor of Leicester Peter Soulsby near a screen displaying a statue of King Richard III on Friday, after a decision to permit the monarch to be buried at Leicester Cathedral in central England. Darren Staples/Reuters/Landov hide caption

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A 2011 photo shows a replica of Christopher Columbus' flagship, the Santa Maria, off the Portuguese island of Madeira. The location of the Santa Maria has been a mystery; an explorer says he might have found it. Eric Risberg/AP hide caption

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Vietnam veterans Melvin Morris (center), Jose Rodela (obscured) and Santiago J. Erevia (left) received the Medal of Honor from President Obama at the White House on Thursday. Win McNamee/Getty Images hide caption

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Abraham Lincoln, the 16th president, used to cook alongside his wife. Brady/Getty Images hide caption

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Fon appliqué workers in 1971, Abomey, Republic of Benin. Eliot Elisofon/National Museum of African Art hide caption

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Tobacco companies incorporated doctors in their ads, such as this 1930 Lucky Strike campaign, to convince the public that smoking wasn't harmful. Stanford University hide caption

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The Cathedral Spires in the Black Hills of South Dakota are just one of innumerable formations across the planet that speak to the Earth's ancient history. K. Scott Jackson/Ohio Water Science Center/USGS hide caption

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Part of the ALMA array on the Chajnantor plateau of Chile points skyward to the Milky Way, our own galaxy. The center of our galaxy is visible as a yellowish bulge crossed by dark lanes, which are themselves huge clouds of interstellar dust. José Francisco Salgado/ESO hide caption

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President Abraham Lincoln's Gettysburg Address as inscribed on the stone at the Lincoln Memorial. Pat Benic/UPI/Landov hide caption

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