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TIL Grizzly bears' muscles suffer no atrophy despite months of inactivity in hibernation; scientists discovered that non-essential amino acids (NEAAs) regulated by particular grizzly bear muscle proteins allowed muscle growth during inactivity.

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neo4W TIL A house cat bit its owner in the middle of the night to alert the family for the house fire. The family got out in time with no injuries and the fire department confirmed the cat was partially responsible for the rescue, "Hero kitty"
86XX TIL there was a woman who grew tired of her Russian adopted son’s violent behavior, so she sent him back on a one-way flight to the country from whence he came with a half-page note explaining the situation.
ppON TIL Anthony Stockelman molested and murdered a 10-year-old girl named “Katie” in 2005. When he was sent to prison, a relative of Katie’s was reportedly also there and got to Stockelman in the middle of the night and tattooed “Katie’s Revenge” on his forehead.
PALn TIL the Domino’s Pizza logo has 3 dots because that’s how many stores there were in 1969. They planned to add a new dot for every store that opened, but that was quickly scrapped as the franchise grew rapidly.
X67E TIL that the first Australian woman to be sentenced to life without parole stabbed her partner, skinned him and then tried to feed him to his children.