Basically the idea is a) There is no absolute reference frame.
b) Moving clocks run slow.
I'm not going to pretend that I understand relativity. Be wary of anyone who claims to without the necessary letters in their name ('Dr.' 'Ph.D' or 'Brian Greene' all work nicely.) What's cool is that we can express time dilation mathematically. I went pretty wild when I first saw that done.
There's a pretty strong movement among physicists to refute the existence of time. I think it's largely cosmologists and proponents of SASY that do this (ie. really fucking clever people) but it always seems like they're grasping at straws to explain everything. It is a daunting task.
Women like big, burly, hairy chested guys because they know that genetic material offers a greater chance of their child making it through the harsh winter. Understandable, but what's interesting to note is that almost as soon as they get pregnant, women start to desire effeminate, caring men who hold a greater chance of actually taking care of their child. Some people think that the advent of birth control and thus hormonally altered women caused the shift from Charles Bronson and Steve McQueen to Zac Efron and the Jonas brothers.
