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Dr. Martin Luther King Jr. addresses marchers during his "I Have a Dream" speech at the Lincoln Memorial in Washington. August 28th 1963
Was Martin Luther King, Jr., a Republican or a Democrat?
American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.
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illustration of the walking titanosaurus, Patagotitan mayorum
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The Fermi Paradox: Where Are All the Aliens?
Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)
7 of the World’s Deadliest Shipwrecks

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landscape of Mercury

  • Messenger: Mercury
    In Mercury: Character of the surface

    …some sparsely cratered regions called smooth plains, many of which surround the most prominent impact structure on Mercury, the immense impact basin known as Caloris, only half of which was in sunlight during the Mariner 10 encounters but which was fully revealed by Messenger during its first flyby of Mercury…

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