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TIL in the movie The Godfather, the horse head from the scene where Jack Woltz, played by John Marley, wakes up to find it lying in his bed, is from an actual dead horse. During rehearsals a fake one was used, and Marley wasn't told beforehand, so his screams during the actual shot were genuine.

npkr TIL The goliath tigerfish is said to be a bigger and deadlier version of the piranha. It has 32 teeth that are of similar size to those of a great white shark and has been known to attack humans and even crocodiles. It has only ever been caught by a handful of fishermen due to the danger it poses.
Z8PJp TIL Iguanas turn black when they’re going through severe or psychosocial stress.
xmw5 TIL there’s a version of chess called “quantum chess” where the pieces are in a state of superposition; the player doesn’t know what a piece will be until it is selected for play. Once selected, it behaves as any one of the conventional pieces and returns to its state of superposition after the move
d8g8B TIL: Rusting gears, beams, & wheels on the coast in Marseille show where an innovative ride was. One could pay to use a special cable car that ran underwater. For safety, pro divers went with the tourists as the pods skimmed along the seabed. It opened in 1966, was shut down after around one year.
x6XW7 TIL that the snake Pareas iwasakii, which feeds only on snails, has the particularity of attacking only those whose shells are oriented to the right because of asymmetric jaws, favoring de facto those whose shells are oriented in the other direction.