Scientists used children’s ‘silly sprinklers’ to solve a physics problem Richard Feynman could not; the reverse version spins 50 times slower
False-color particles reveal water flowing into a reverse sprinkler, making the invisible movement of fluid clearly visible.Photo credit: NYU’s Applied Mathematics Laboratory 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…
