There's also a 4th spatial dimension. The 4th dimension does not automatically equal time - it is only considered that when talking about "space-time". also, c

There's also a 4th spatial dimension. The 4th dimension does not automatically equal time - it is only considered that when talking about "space-time". also, check out Braid (braidgame.com) for a fun puzzle game that requires you to consider time travel.