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TIL A T-Rex’s arm is about as long as an average human male’s arm.

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B7LK TIL that the sabre-tooth squirrel featured in the 2002 film Ice Age was fictional… until a real one was discovered in 2011.
EgbEV TIL Gliese 710 is a star that is projected to flyby the solar system in 1.2 million years, at a distance of "only" 2 light-months. The closest star to us is currently 4.25 light-years away.
b90Np TIL since 2018, the Circus Roncalli in Germany has entirely eliminated the use of live animals. Using 11 projectors, holographic acts replicate traditional circus fare, like a performing elephant, an ethereal ring of horses galloping around, even a huge goldfish hovering in the middle of the arena.
14e7 TIL Nazi Germany produced Chlorine Trifluoride for use as a dual purpose incendiary and poison gas in WW2. ClF3 causes almost anything to spontaneously explode on contact, including wood, concrete, sand, gravel, glass, asbestos, water, and of course flesh.
8aZ0P TIL the adhesive used on Post-It notes was developed in research at 3M by a scientist Dr. Silver as a failed super strength adhesive. For years Silver could not think of a use for it until his fellow scientist Art Fry considered its use to hold notes in his hymnal to mark pages for choir practice.