Scientists used children’s ‘silly sprinklers’ to solve a physics problem Richard Feynman could not; the reverse version spins 50 times slower

If you’ve ever watched a “silly sprinkler” in action (those bright, looping contraptions that twist and spray water in wild patterns) you’ve probably just seen them as summer fun. But a group of mathematicians have turned these backyard toys into tools for solving a famous physics puzzle that stumped even Nobel Prize–winning physicist Richard Feynman.

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