Happy Quantum Day!

On this day in 1900, Max Planck presented his theory of blackbody radiation to the German Physical Society (Deutsche Physikalische Gesellschaft, DPG).
https://en.wikipedia.org/wiki/Max_Planck#Black-body_radiation

Sometime during December of 1925, Schrödinger came up with the wave equation of a nonrelativistic electron; he wrote about it in a letter to Wien on 1925-12-27. So we could say that Quantum day has a half-life on the order of 10 days!