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TIL that humans are the only animals that have chins
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I've just assumed, if you're willing to accept that the human fist evolved for punching, that the chin evolved for taking a punch.
Wait, how did they make the cadaver arms punch and slap?
I take "a pendulum-like device" to mean they suspended either the arms or the targets and swung them to a collision.
This whole device sounds morbid but hilarious. Did they like strap dead bodies to a swing and position them like Superman and swing their bodies into a wall fist fist?
That would have been awesome, but I suspect that it was just the arms and that it was powered in some way, hence "pendulum-like".