A strange little side quest
Between one round of Pandemic TD Battles and the next, this is worth knowing: Games resembling checkers were being played thousands of years ago; evidence of related games reaches back to around 1600 BC. It also connects to a different milestone: In 1958, Tennis for Two used an analog computer and an oscilloscope to turn simple physics into a playable tennis-like demonstration. Not bad for a few facts hiding behind a Play button.