Quote Originally Posted by Xei View Post
The point is, people often spread around this idea that objects never actually touch, when it isn't really true. Touching is only electrostatic repulsion anyway.

Electron clouds are arbitrary; they are volumes in which an electron has a certain probability of being found. Any electron clouds can touch if you allow the probability to be high enough (electrons can potentially be found infinitely far away from a nucleus).

About nuclei touching; actually it's kind of arbitrary on the subatomic level too. Nucleons aren't spheres at all, they are just sets of three coordinates (quarks). They are arbitrarily assigned a radius at which the strong and electrostatic forces cancel, but it doesn't really represent a physical boundary.
Quarks aren't points. They are the smallest thing we know, and probably the smallest thing that we can observe, but not points.