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TIL of the HMS Black Joke, a former slave ship captured and given to the British West Africa squadron. Over a 5 year career she captured dozens of slave ships and freed thousands of African slaves bound for the Western Hemisphere.

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j66Mp TIL that "penile implants" exist and to get an erection with one you squeeze your nutsack. They're used for erectile dysfunction and FtM transitions
D1pyp TIL Scientists found cancer in a 1.7 million year old foot bone and a 2 million year old spine from two ancient hominin specimens in South Africa. Before these finds, the oldest dated cancer in a human was only 120,000 years old.
NX0oe TIL saturation divers have to live weeks in a pressurized environment underwater.
9wWaD TIL about ternary plots. You can visualise 3 quantities on a 2d triangular graph if they add up to a constant (eg. soil components or colour composition). One graph is “x+y+z=1” which makes a triangle on positive axes, with the regular 3d gridlines intersecting to form triangular ones in the graph.
rjj4 TIL of Ewen Cameron, who in the the 50s ran experiments on humans which involved giving several electric shocks a week, taping blacked out football helmets to their heads and playing repetitive messages in their ears for months at a time. Some patients apparently forgot who they were and how to talk