Cause and effect

I've been thinking...

1) Everything is both a cause and an effect. There may be no original cause for something, but even that would be an event.

2) I am not sure who's theory this is but...if you could know the trajectories of EVERY atom in the ENTIRE universe, then you would be able to map out their future interactions and could therefore, predict the future. If you saw the future, would you have free will over it, if you saw yourself getting shot, would you be able to stop that from happening by not being there at the time? Or would it still happen somehow, even if you just get shot at a different location?

your thougts?