> if you knew the position and velocity of every particle in the universe That's a big if, which quickly shot down my then early and naive absolute determinism

> if you knew the position and velocity of every particle in the universe That's a big if, which quickly shot down my then early and naive absolute determinism view when Heisenberg uncertainty principle reared its head: σx•σp >= h/2π IOW try to increase knowledge of speed and you lose as much knowledge of position.