I want to know the answer to the following question:
Who first introduced the idea that matter is made of atoms?
All the background I'm provided with is that "Other influential pre-Socratics or rational philosophers include Protagoras (like Anaxagoras a friend of Pericles), known for his famous dictum "man is the measure of all things" and Democritus, who proposed that matter was composed of atoms.". Is that enough to answer the question?