VA: Really? Care to give a citation? Which Greeks? What observations/theories etc from that period still stand? All I can think of are the spherical Earth and its size
Funny, first you present a scientific theory from over 2200 years ago:
VA: Pythagoras and Archimedes knew the Earth is sphereical; Erastosthenese measured its diameter
Then you claim ignorance of any 2200 year old scientific theories.
Clearly you are trying to play the game of gotcha (but you are not doing a very good job).
As for your question of "which Greeks" - Aristotle is credited with establishing empiricism and the foundation of the scientific method.
Other Greek scientific theories:
Democritus - matter is make up of atoms
It was a clever experiment that established the Earth was round, but it is not an example of what a scientist would call a "theory".
Other Greek scientific theories: Democritus - matter is make up of atoms
Philosophy (not science yet). Was this hypothesis tested in his day?