The Atomist

The Atomist, Leucippus and Democritus, seem to build on Eleatic arguments and Anaxagoras by going off of the idea of not coming to be or passing away.  Building on Anaxagoras' "ingredients" that make up everything in the cosmos.  Leucippus and Democritus call these "ingredients" atoms. Atoms cannot be changed, but can be repositioned.  Opposing the atoms are "the void" or "the empty".  The Void is where the atoms are not but the atoms can move through the void.
The amount of knowledge that these two had of physics, even though for the most part it was speculative, amazing me because of how right they were.  With out microscopes to see what was actually happening.  They knew that there was some microscopic object that composed the larger objects.  They also thought of there being space between atoms and with the space the atoms can move.  We now know that atoms are constantly moving.