Jellyfish for Science

In a typical vortex ring, the fluid particles move in roughly circular paths around an imaginary circle (the core) that is perpendicular to those path. This is well visualized by any jellyfish that jumps in for a ride https://t.co/kol7cVBoVx [gif: https://t.co/oK9nCWQFwm] pic.twitter.com/HKfaKvEaID

— 𝕏stream of Consciousness (@XStream1973) April 2, 2019