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TIL Astronomer Thomas Harriot observed the Sun directly through a telescope and left nearly 200 drawings of sunspots from the period 1610–1612. To protect his eyes, he took advantage of mist and fog to dim the Sun's brightness

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6E5Z TIL on September 7, 1978, a Bulgarian Dissident Writer named Georgi Markov was waiting at a bus stop in London when he felt what he thought was a bug bite. Three days later he died, having been shot in the leg with a sophisticated umbrella-gun loaded with a bullet containing ricin poison.
L87r TIL of Dr. Mary Edwards Walker who, during the Civil War, stood on the Union front lines for nearly two years, including the wake of the bloody Battle of Chickamauga. She is the only woman to receive the Medal of Honor.
9wPY6 TIL about the Hotel du Lac in Tunis, Tunisia constructed in the 1970s which is an example of Brutalist architecture. The hotel has a cantilevered design resulting in a top floor double the length of the ground floor and has prompted comparisons with the sand crawler vehicle of the Star Wars films.
kJ7ZW TIL about Patti Lyle Collins, head of the US Dead Letter Office. She was known for her ability to deciper hard to read or incomplete addresses on mail, such as being able to deduce that a letter addressed to "Presidente Sterite, Catimoa" was meant to go to "President Street, Baltimore".
mxEvy TIL about Gangkhar Puensum, which is probably the highest mountain no one has ever climbed, since it's located in a country that bans climbing mountains.