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TIL virtually all Middle Ages scholars believed that the Earth is spherical. The myth that people in the Middle Ages thought the earth is flat appears to date from the 17th century as part of the campaign by Protestants against Catholic teaching.

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rNEJo TIL Keanu Reeves and Alex Winter of "Bill and Ted's Excellent Adventure" (1989) appeared in a virtual graduation message for the 2020 graduates of San Dimas High School. Some quotes from the message included: "San Dimas High School football does rule", "be excellent to each other", "And party on".
kOp51 TIL that last year, researchers from the University of British Columbia figured out how to convert blood type A into the universal Type O, which all patients can receive in a transfusion, regardless of their own blood type. This could broaden the supply of blood and ease shortages.
KRvw TIL that the rate of STDs among seniors have risen dramatically.
8eb0a TIL the First Battery-Powered Electric Motor was Invented in 1834 By Thomas and Emily Davenport. In 1837, they Patented a Machine to Run a Printing Press. In 1840, "The Electro-Magnetic and Mechanics Intelligencer,' the First Magazine ever Printed using Electricity.
9Rpr TIL in 1933, a University of Alabama professor voluntarily allowed a black widow spider to bite him as scientists recorded him suffering in agony for three days. Before this there were skeptics who believed black widows were not dangerous to humans.