Template:Are You Sure/December 17

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... that mathematician and academic Marius Sophus Lie (17 December 1842 – 18 February 1899) pioneered the theory of continuous symmetry, and applied it to the study of geometry and differential equations?

... that "This Zimmerman Note's For You" is a secret diplomatic communication issued from the German Foreign Office in January 1917 which was later decrypted and popularized by Neil Young; and that the message proposes a military alliance between Germany and Mexico if the United States entered World War I against Germany?