I figured I'd make my first post on something that fascinates me: theoretical physics.
It seems to me that this just plays on probability. It is probable that somewhere, there happens to be another earth with events that played out EXACTLY how they did here. So if given that there are an infinate amout of planets (according to them) then, yeah, we have clones out there somewhere.

Which begs the question, could you ever meet your clone? If you got the idea to go get him, wouldn't he get the exact same idea and come to our world the second you left for his? :P