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TIL alcohol is a banned substance in competitive shooting because a small amount can relax a competitor and slow their heart rate without impairing reaction time and motor skills.

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8ann4 TIL actor Edward James Olmos who played William Adama in the show Battlestar Galactica, had a clause in his contract about no aliens. "The first four-eyed monster I see, I'm going to faint on camera, and you're going to write me off the show." The show became a cult classic for its gritty realism.
BgBpk TIL that Dave Grohl played drums on all of Tenacious D’s studio albums
Bg8wr TIL countries such as Brazil, Chile, China, Japan and South Korea use different types of tally marks to ours (US, UK, Australia, etc).
b9OjE TIL, the most successful hunter among apex predators is the African wild dog, with greater than 60% of their chases ending in a kill, which is much higher than that of a lion (27-30%) and hyena (25-30%)
N6B8 TIL that if human were sensitive to light of all wavelengths, Betelgeuse would be the brightest star in the sky (other than the Sun).