Atoms are indivisible; they are the elementary grains of reality, which cannot be further subdivided, and everything is made of them. They move freely in space, colliding with one another; they hook on to and push and pull one another. Similar atoms attract one another and join. This is the weave of the world. This is reality. Everything else is nothing but a by-product—random and accidental—of this movement, and this combining of atoms. The infinite variety of the substances of which the world is made derives solely from this combining of atoms.
