trc (09/17/82)
Sorry, I did NOT invoke simultaneity - the age differences need only checked when the twins return to the same frame of reference. Please also note that both twins in my description changed frames of reference to an equal degree. The only difference in their experiences was the amount of time spent in those frames of reference. This certainly seems to imply that it is the frame of reference, not merely the changing of frames, that makes the difference. Tom Craver houti!trc