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TIL a previously owned black slave was asked to calculate the number of seconds in 70 years, 17 days and 12 hours in order to prove equality in intelligence between blacks and whites. Not only did he accomplish the feat in 1.5 minutes, but he included the leap years in his calculations.

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M897 TIL The asteroid impact that killed the dinosaurs was powerful enough to send Earth rocks to Mars and even Europa. As a result, if we ever find life on those worlds it may actually have originated on our own planet.
XmaQ TIL that the Nazis tried to build a Super-weapon named the V3 cannon, with a range of 165km and the potential to hit London in 2 minutes with it’s 310lb armament. An installation of 25 guns was in the final stages of construction when it was destroyed by the famous RAF Dambusters.
gBd9 TIL that the allies tricked the German postal service into inadvertently delivering anti-Nazi propaganda by airdropping bags of mail near bombed mail trains.
8avnZ TIL when actor Ving Rhames won a Golden Globe in 1998, he called fellow nominee Jack Lemmon to the stage and gave him the award, saying, "I feel like being an artist is about giving, and I'd like to give this to you, Mr. Jack Lemmon."
xmXw TIL that old school medicine cabinets had a slot at the back to dispose of razor blades, but they went straight into the drywall. This has caused many incidences of people finding hundreds of accumulated razorblades in their walls when renovating.