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TIL of Yuichiro Miura, the oldest man to summit mount everest. At age 80, it was the third time he had made the ascent in 10 years.

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R76ml TIL space shuttles' main engines burn cryogenic propellant at ~3500K (hot enough to boil iron). They are fueled by cooling channels built-in to the nozzles themselves, which simultaneously cool the nozzle at a steady state while fueling the engine.
yVoBX TIL Fire Ants are an invasive species to the US. The FDA estimates $5 Billion is spent annually on medical treatment, damage, and control in Red Imported Fire Ant infested areas.
OoZZ7 TIL of operation Tamarisk | During the cold war, soviet troops weren't issued toilet paper in the field, leading to them using official documents; Spies were sent in to retrieve these documents from disposal bins. It's seen as one of the most successful espionage missions of the cold war.
690QJ TIL the Boeing B-52 Stratofortress' official nickname is "BUFF" which is an acronym for "Big Ugly Fat Fucker"
8eMmP TIL Black people were denied vanilla ice cream in the Jim Crow south – except on Independence Day