Motion and Vacuum
"How can motion be reconciled with a single, universal substance?
"Parmenides (~480 BC) Ð motion is an illusion; there is no vacuum
"Zeno (~445 BC) Ð motion is absurd
"Empedocles (~445 BC) Ð four elements
ÐEarth, water, air, fire
"Anaxagoras (~445 BC) Ð infinite number of elements
"Atomists Ð atoms and vacuum