Answer:
This is MY answer! I did not plagiarize, and these are my words. You can use my answer, but do not copy it! [I suggest rewording the answer, because then it doesn't count as plagiarism]. Thank you! --
People flocked toward new Greek cities during the Hellenistic Era. This is because the era emphasized on philosophy, scientists, literature, sculpture, architecture, etc. New kings wanted new and old [Greek] cities to be the (cultural) centers of Greece. Scientists from this era made [major] discoveries in astronomy, and in math.
Two important philosophers - Epicurus and Zeno - also helped with Greek culture. They both showed the world different kinds of ways to look and find happiness. Epicurus worked with pleasure and emotion/feeling while Zeno practiced with reason and logic.
I hope this helps!~