No one has yet managed to travel through time – at least to our knowledge – but the question of whether or not such a feat ...

The Clock Paradox This celebrated consequence of the special theory of relativity is that two clocks that are moving with respect to each other run at different speeds. The effect rests on nothing ...

Your friend is also holding a clock. If you could see your friend's ... show the effects of time dilation that he called the "twin paradox." It's a lot like the Time Traveler game you just played.

IN the course of reasoning on this subject with some of my more recalcitrant friends, I have come across a numerical example which I think makes the matter easier to follow than would any ...