I want to know the answer to the following question:
What colleague of Democritus, also a Greek philosopher, helped him propose the particulate theory of matter?
All the background I'm provided with is that "The idea that matter was built of discrete building blocks, the so-called particulate theory of matter, was first put forward by the Greek philosophers Leucippus (~490 BC) and Democritus (~470–380 BC).". Is that enough to answer the question?