Dear Ross;- This reply comes from a disaster movie. What happened was the Earth used to spin in the other direction. Then this here meteor crashed in either in Mexico or New Jersey and destroyed the dinesaurs and Lawrence Welk. The meteor came in at a 45 degree angle which stopped the existing spin and sent it in the other direction. At that time, righthanded shells were called "sinistral" and brought especially high prices. The busycon whelks were all buried at the time, and never noticed the change. I do hope our science is thus enriched. Art