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On this day: November 21

Published On: Nov 20 2012 02:35:16 AM CST   Updated On: Nov 21 2012 01:00:00 AM CST

The pilgrims sign the Mayflower Compact, Thomas Edison announces the phonograph, "Frankenstein" and "Rocky" premiere 45 years apart, and Tweety Bird makes his debut, all on this day.

OTD November 21 - Albert Einstein
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Arnd Wiegmann/Reuters

1905: Albert Einstein's paper, "Does the Inertia of a Body Depend Upon Its Energy Content?," is published in the journal "Annalen der Physik." The paper reveals the relationship between energy and mass, which leads to the mass–energy equivalence formula E = mc².

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