So I was watching the NOVA special, The Elegant Universe(and omg is it elegant), and they were talking about quantuum mechanics. Specifically what sparked the train of thought that I am about to detail was that in QM there is the certain possibility that a particle might actually travel through a wall, albeit rediculously small. This got me thinking about collision detection in games/real time simulations. Computers have the limiting factor of amount of time to process. Since this is the case, certain measures have to be taken that an object does not in fact travel through a wall. For example: Take this particle a, and lets try to pass it through this wall |. a-> | | a This is possible because by calculating the distance traveled from the last position of a, the velocity of a was great enough that at the time resolution available since the last known position of a, a would pass through the wall (to solve this you just draw a line between the two positions and use that to test the collision. I'm sure most the people here know that...). This brings me back to QM. Why is there that possibility that the particle will pass through the wall? Is it because the resolution of time is not infinite (I am under the impression that it is)? Maybe there is a finite resolution to the distance a particle can travel at one instance due to its current velocity regardless of time. I have absolutely no idea about quantuum mechanics. I just had a flash of supposed insight and thought I would ask the question. Please, let me know where I am wrong and why. I like being proven wrong. It elevates my understanding of things.