[Time travel](http://en.wikipedia.org/wiki/Time_travel) is the concept of moving between different points in time, often instigated by non-trivially topology of space-time, such as, a wormhole. DO NOT USE THIS TAG for e.g. change of coordinate systems, change of time coordinate, or topologically ...
I read somewhere that according to relativity, black holes and other space related stuff it is possible to jump into past. Is it possible for anything to go back in time either continuously or by ...
I've always heard people saying, "Faster than light information transfer can't happen because it would violate causality! Effects can precede their causes!" However, I'm trying to think of a ...