On This Day in 1849, the Envelope Machine was Patented. Before this, you had to grow your envelopes from Post-its and nightsoil.
On This Day in 1922, Leonard Thompson received the worlds first successful insulin injection. Up until that point they had just been throwing it at him in his sleep.
On This Day in 1943, Duke Ellington played at New York City’s Carnegie Hall for the first time. He started the show by shouting “You aint heard nothing yet.” a subtle Fuck You to his old nemesis, Al Jolson. No one got it.
On This Day in 1960, the Bathyscaphe Trieste dove a record-breaking 35,800 feet into a breathtakingly deep pool of custard.