David Tong, a theoretical physicist at Cambridge, is excited about solitons. And he wants to share that excitement with you, and he's willing to climb in a bathtub to do it. [embed]http://www.youtube.com/watch?v=Ederft9dkag[/embed] It's a fun video, produced by the Institute of Physics. David's interest is really in the issue of quark confinement in QCD, one of the Clay Millenium Prize problems. But we get there by thinking about bubbles and vortices and smoke rings. Worth a look.