Greetings! I've looked around in the FAQ and around the forums and couldn't find the answer to my question, so I've decided to ask. If however I did miss the answer, I apologize. Well, it's quite elementary actually. I am wondering if it is correct to assume that no two solid objects actually touch each other, i.e. there is always a layer of space between two adjacent atoms of different objects. And if my assumption is correct, what is friction then? And what about non solid objects? Thanks alot.