Today in Entrepreneurial History: November 11

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1675 – Gottfried Leibniz demonstrates integral calculus for the first time to find the area under the graph of y = ƒ(x).
1918 – World War I: Germany signs an armistice agreement with the Allies in a railroad car in the forest of Compiègne, France. The fighting officially ends at 11:00 (The eleventh hour in the eleventh month on the eleventh day) and this is annually honored with a two-minute silence. The war officially ends on the signing of the Treaty of Versailles on June 28th 1919.
1926 – U.S. Route 66 is established.
1930 – Patent number US1781541 is awarded to Albert Einstein and Leó Szilárd for their invention, the Einstein refrigerator.