The Space Shuttle Challenger disaster in 1986 killed all seven crew members and grounded the shuttle program for nearly three years.
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Operation Northwoods was a proposed U.S. plan in the 1960s that was never carried out.
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The Ice Age ended gradually as global temperatures rose.
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The first mammals appeared during the age of dinosaurs.
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The Olympic torch relay was introduced in the 20th century.
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The Treaty of Versailles officially ended World War I.
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The Black Death significantly reduced Europe’s population in the 14th century.
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The woolly mammoth lived during the last Ice Age.
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The Chicxulub crater is linked to the dinosaur extinction event.
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