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Posted

The short lever

initially hammer stone attached to short lever = less cracked knuckles and more force

soon followed by hammer stone attached to short lever = squished fingers

progress a double edged implement :rolleyes:

Posted
pocket knives, but more specifically, the assisted open-close mechanics of the them.
x2!
...chopsticks...
x12!

Alright, that was a typo, but I left it.

How about the boomerang?

Personal favorite: thermos -- it keeps hot things hot, and cold things cold -- how do it know?

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