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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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What’s the Difference Between Bison and Buffalo?
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Are Bats Really Blind?
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The Fermi Paradox: Where Are All the Aliens?
Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
10 Famous Artworks by Leonardo da Vinci
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Why Is Thanksgiving in the U.S. Celebrated on a Thursday?
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Brain Games: 8 Philosophical Puzzles and Paradoxes

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essay by d’Alembert

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discussed in biography

  • Dimitry Levitzky: portrait of Denis Diderot
    In Denis Diderot: The Encyclopédie

    …d’Alembert expanded into the momentous Discours préliminaire (1751). The history of the Encyclopédie, from the publication of the first volume in 1751 to the distribution of the final volumes of plates in 1772, was checkered, but ultimate success was never in doubt. Diderot was undaunted by the government’s censorship of…

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