Can You Blow a Doughnut-Shaped Soap Bubble?...
The following is an excerpt from Why Are Orangutan... ...he forces created at the disappearing hole in the torus . This situation differs from that in a solid torus such as a bicycle inner tube, because soap bubble... ...r surface from the inner to the outer part of the torus...
http://www.neatorama.com/2012/11/15/Soap-on-a-Hope-Can-You-Blow-a-Doughnut-Shaped-Soap-Bubble/
