Crazy pool vortex

This unique phenomenon can be easily reproduced in a pool on a sunny day. If you liked this video check out these: How to Make a SQUARE Vortex Ring! Why Hawaii’s volcano is so UNUSUAL Subscribe - Help us translate our videos! Many thanks to the Vlogbrothers for their sponsorship of this video! Also thank you to Daniel Walsh for answering many fluid dynamics questions, to Jacob Schalch for filming the burning penny, and to Justin and Brendan for their donations to support Physics Girl!