On this day: November 21

Published On: Nov 20 2012 02:35:16 AM CST   Updated On: Nov 21 2013 01:00:00 AM CST

Thomas Edison announces the phonograph, "Frankenstein" and "Rocky" premiere 45 years apart, Tweety Bird makes his debut, and millions tune in to find out "who shot J.R.," 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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