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TIL it is believed that the invention of the wheel was so challenging that it probably happened only once, in one place. Before its invention in 3500 B.C., humans were already casting metal alloys, constructing canals and sailboats, and even designing complex musical instruments such as harps.

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mxAEY TIL of the land of brushes. Kumano city in Japan's Hiroshima prefecture is famous for producing handmade brushes that are used by Hollywood makeup artists among others. But it only specialized in brushmaking after farmers had to sell brushes to earn an income during the agricultural off season.
KKQ4 TIL That Russia had a genocide with far more people in WWII, but because they joined the allies last minute, no one, including men still alive today, was held accountable for these actions.
1aNkV TIL that ancient greek males were not ashamed of exposing their entire genitalia, only the glans. This led to the habit of covering it up with the foreskin using a special knot called "kynodesme", or dog tie.
QJ8Ja TIL that under Franklin Delano Roosevelt there was an "Indian New Deal" and its "goal was to reverse the traditional goal of assimilation of Indians into American society and to strengthen, encourage and perpetuate the tribes and their historic traditions and culture."
YpOlx TIL that suicide rates are alarmingly high among gender nonconforming individuals. 50.8% of female to male persons have attempted suicide, 41.8% among those identifying as non binary, and 29.9% among male to female.