Mike <mboyd@xxxxxxxxxxxx> wrote: "Whether you believe relativity or not is beside the point. The theory is internally consistent and agrees with observation so their are no paradoxes." Not so, as ably demonstrated by one of the World's greatest experts in Special Relativity, the late Prof. Herbert Dingle, in his book, "Science at the Crossroads," which, if you can tolerate Dingle's highly verbose style, is a fine critique of scientific paradigms in action. In this book, Dingle shows that clocks, according to Special Relativity, must at the same time run faster and slower than each other. In a paper that he references in the book, he does the same thing regarding lengths. Mike also wrote, "The simple answer is that one of the twins turns around and thus feels accelaration while the other doesn't. This is where the symmetry (and supposed paradox) is broken." However, the "twins paradox" is a contradiction within Special Relativity. Special Relativity does not deal with acceleration, which is handled by General Relativity. SR and GR are incompatible. Neville. --------------------------------- ALL-NEW Yahoo! Messenger - all new features - even more fun!