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TIL When quicklime is heated to 2400°C it emits an intense glow. Before the invention of electric lights, quicklime was used as a lighting source for theater productions, and this is where the phrase "in the limelight" when referencing celebrity comes from.

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6E8Mm TIL that Isaac Asimov died from complications of HIV. In 1983 got HIV from a blood transfusion during heart surgery. His doctors told him to keep it quiet. 10 Ten years later, after most of Asimov's physicians had died, Asimov's family agreed that the HIV story should be made public.
wXdo TIL the Naval Investigative Service knew the term “Friend of Dorothy” referred to gay men, but misunderstood the history of the phrase and launched an investigation to find this woman named “Dorothy” who they believed was at the centre of a ring of gay military personnel.
YpwoZ TIL about Europe's southernmost glacier. It is located in cave Eptastomo at Parnassos mountain, Greece. At altitude of 1300m the temperature inside the cave never goes above 0°C. Its name means seven orifices and it is only accesible through rapel ropes.
Jdel TIL that Peter Brabeck-Letmathe (Chairman of Nestlé) said that the idea of water as a basic human right is “extreme”
J177l TIL about Tiangong (“Sky Palace”), a permanently crewed Chinese space station. It operates in low Earth orbit between 210 and 280 miles above the surface. Launched on 29 April 2021, it's been manned by a crew of 3 to 6 astronauts since 5 June 2022.