› added 4 months ago

16

TIL, a company called “NutEx” made radioactive condoms in the 1940s

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6EWEm TIL during The Great Purge, citizens couldn't sleep at night because they were terrified of a knock on the door, meaning they would be arrested and sent to a labor camp. Even Stalin's own mother fainted after she heard a knock on the door, although Stalin had only sent bodyguards to protect her.
GwlN TIL that the oldest continuously serving navy in the world belongs to Portugal.
J1MZl TIL The U.S. Survey Foot was officially retired January 1, 2023
kPB4 TIL there is a Chinese conceptual artist named Liu Bolin who specializes in making himself invisible in everyday surroundings.
RQ49 TIL that Hempcrete is a hemp-based concrete alternative that turns to Limestone by absorbing CO2 during the first 100 years after it’s cast, making it a truly carbon negative building material.