Happy Birthday, LED!
October 9, 2012
Today (October 9) in 1963, Nick Holonyak, Jr. demonstrated the first visible-spectrum light-emitting diode to the bean-counters at General Electric. He mixed Galium and Arsenide in a way that chemists told him was impossible to create that first familiar red glow. Today, we're on the verge of replacing all innefficient filament-based lights with his invention (if the conspiracy theorists don't get their way, that is.)