History Blog

November 21

Happy Birthday Stan Musial–92 Margaret “Marlo” Thomas–75 Harold Ramis–68 Goldie Hawn–67 Lorna Luft–60 Colette “Nicollette” Sheridan–48 Björk Guðmundsdóttir–47 ; 1877 – Thomas Edison announces his invention of the phonograph, a machine that can record and play sound ; 1905 – Albert Einstein’s paper, Does the Inertia of a Body Depend Upon Its Energy Content?, is published in the journal “Annalen der Physik”. This paper reveals the relationship between energy and mass. This leads to the mass–energy equivalence formula E = mc².