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 ...

It's a monumental head-scratcher known as the 'grandfather paradox', but a few years ago physics student Germain Tobar, from ...

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.