Reverend Jeff Moore blesses a biker at the Buffalo Soldiers Motorcycle Club rally in San Jose, Calif. Leila Day/KALW hide caption

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Coins from the Thomas Lockwood Collection were recently found to be rare and priceless. From a description by the University at Buffalo, from top to bottom: A gold aureus of the Roman emperor Otho; a tetradrachm of Athens; a tetradrachm of Alexander the Great; a silver tetradrachm of Syracuse (Sicily); a gold aureus of the emperor Nero; and a gold octodrachm of Arsinoe II." Douglas Levere/University at Buffalo hide caption

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Russian soldiers guard the entrance to the Ukrainian military base in Perevalne, Crimea, last March. Russia was criticized widely internationally after seizing the region. Now Russian lawmakers are considering a bill that says Crimea was illegally given to Ukraine in 1954 and should have been part of Russia all along. Ivan Sekretarev/AP hide caption

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Until about 30,000 years ago — around the same time these animals were drawn on the walls of France's Chauvet Cave — there were at least five other species of humans on the planet. Jeff Pachoud/AFP/Getty Images hide caption

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Employees of the U.S. Radium Corp. paint numbers on the faces of wristwatches using dangerous radioactive paint. Dozens of women, known as "radium girls," later died of radium poisoning. One of the last radium girls died this year at 107. Argonne National Laboratory hide caption

itoggle caption Argonne National Laboratory

Mary Mallon, known as "Typhoid Mary," was immune to the typhoid she carried. Working as a cook, she spread the disease in New York and ended up quarantined on Brother Island (above) for more than two decades. Bettmann/Corbis hide caption

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The Erebus and the Terror among icebergs, as illustrated in The Polar World by G. Hartwig in 1874. Sir John Franklin, British naval officer and arctic explorer, commanded the 1845 expedition of the ships to search for the Northwest Passage. All members of the expedition perished. G. Hartwig/Universal History Archive/Getty Images hide caption

itoggle caption G. Hartwig/Universal History Archive/Getty Images

The Erebus and the Terror among icebergs, as illustrated in The Polar World by G. Hartwig in 1874. Sir John Franklin, British naval officer and arctic explorer, commanded the 1845 expedition of the ships to search for the Northwest Passage. All members of the expedition perished. G. Hartwig/Universal History Archive/Getty Images hide caption

itoggle caption G. Hartwig/Universal History Archive/Getty Images

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

itoggle caption Ed Palumbo/Library of Congress