From: Jed Rothwell
* That's a splendid little video, and an elegant demonstration of spin conservation. I urge people to see it. . if it is authentic, it is splendid indeed. * The air particles and spin both rotate 90 degrees as a result of the collision. Fascinating! . that is the part that "almost" looks too contrived to me - to be accepted as true without a thorough investigation (at least to my thinking). There simply does not seem to be enough momentum in the initial colliding tori to carry forward and retain the spin structure for that kind of orthogonal change and transfer. It would be relatively easy to fake with computer graphics, if someone were so inclined . but I hate to even mention that possibility, since there is absolutely no apparent reason to believe that deception was involved - other than there are plenty of geeks who would delight in the challenge. Jones
