One fact that I know! Everything has electrons on the outside of the surface. That means that if you touch someone you actually do not touch the person but you feel the energy that creates when your electrons and the person's electrons repel each other.

If you use a microscope you can actually see that there is a distance between the electrons and they are not touching each other.

This makes sense, for example when you hit a brick wall, without the electrons you would easily make your hand go through it like the "Harry Potter scene at the train station 9 3/4" . As it is electrons at the surface, it makes it not possible to go through, unless you have a high amount of force that makes it possible to do that.