Anniversaries
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Anniversaries: On This Day in History and Fiction: November 21
1652: Mathematician, physician, and astronomer Jan Brożek dies. He contributed to a greater knowledge of Nicolaus Copernicus' theories and was his ardent supporter and early prospective biographer.
1905: Albert Einstein's paper that leads to the mass–energy equivalence formula, E = mc², is published in the journal Annalen der Physik.
1996: Theoretical physicist Mohammad Abdus Salam dies. He shared the 1979 Nobel Prize in Physics with Sheldon Glashow and Steven Weinberg for his contribution to the electroweak unification theory.