"Decades-Old Feynman Sprinkler Puzzle Solved by Physicists"

Physicist Richard Feynman's long-standing puzzle about the direction of rotation in a reversed sprinkler system has finally been solved. Through precise experiments and modeling, researchers found that the reverse sprinkler does indeed rotate in the opposite direction, but at a much slower and unsteady rate, driven by jet propulsion. The study sheds light on the complex motion of fluids and provides a solid understanding of the mechanics of the system, with potential applications in devices with similar flow dynamics.