The good old days: A flight attendant serves coffee and sandwiches to a passenger on board an American Airlines flight, circa 1935. Frederic Lewis/Archive Photos/Getty Images hide caption

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Sweet or salty? Historically among Eastern European Jews, how they liked their gefilte fish depended on where they lived. This divide created a strictly Jewish geography known as "the gefilte fish line." Claire Eggers/NPR hide caption

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Venetians celebrate during the Festa del Redentore in Venice. The festival began in 1576 when the Republic's Senate voted to build a church on the Giudecca Island to Christ the Redeemer to thank God for the city's deliverance from the Plague. Marco Di Lauro/Getty Images hide caption

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As President Jimmy Carter looks on, Egyptian President Anwar Sadat (left) shakes hands with former Israeli Prime Minister Menachem Begin at Camp David on Sept. 6, 1978. AFP/Getty Images hide caption

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Neonta Williams (left) shares family letters dating back to 1901 with preservationist Kimberly Peach during the Smithsonian's Save our African American Treasures program at the Birmingham Civil Rights Institute. Peach advises her to use archive-quality polyester sleeves to protect the fragile papers, rather than store them in a zip-lock bag. Debbie Elliott/NPR hide caption

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Theodore Roosevelt, seen here in 1885, was haunted by the fact that his father didn't fight in the Civil War. Library of Congress Prints and Photographs Division/PBS hide caption

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The Star-Spangled Banner, played before every baseball game, has become so tied to the sport that an old joke asks, "What are the last two words of the national anthem?" and answers, "Play ball!" Michael Dwyer/AP 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

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