The concept of infinity is, I think, very well accounted for in the theory of multiple dimensions/universes. It's basically the idea that for every action (or inaction) you take, at every moment, the universe splits into two. So to break it down, if you're sitting in your room, deciding whether or not go to college, at the very moment you decide to go, reality splits, and a dimension is created in which you decide not to go. When you think about it, and think about all the possible things you can do/choose/decide every second, and when you think about all the living things in the world who do the same, and when you think about all the alternate universes that were already created and they themselves are subdividing during the history of time, that to me, is the true idea of infinity.

This is a fun concept to think about, for there may be a dimension out there, where you are a non-pot-smoking politician, who is talking on Fox News about how Marijuana is a gateway drug NOT cool.

When you really sit there and ponder, the possibilities truly are endless. This theory of multiple dimensions also fits in with many other theories.

Also, this works well with the Schrödinger's cat experiment. In this paradox, the cat locked in the box, and because of quantum mechanics and the wave/particle nature of atoms depending on whether they're observed or not, the cat is both dead and alive at the same time until someone opens the box to check on the cat. This would not make sense in a world of a single dimension, but because of multiple dimensions, as soon as you open the box to find a, lets say, dead cat, the dimensions splits and there is one created where you open the box and find a cat thats alive. Therefore, you have both a cat that's dead and alive -- no paradox.

You can really get lost deep in this thinking.