what are three contributions by the Greeks that have contributed immensely to the well being of modern humans?

greeks were the first democracy... all democracies now are based on greek democracy

justice by jury.... that was a greek invention and the romans patterned thier justice system after it and ours is roughly based on it as well

architecture.. we still use grecian architecture to this day

philosophy... the greeks almost invented reasoning and philosophy which influenced the rennaissance and us today

science.... contrary to popular belief they had huge advancements in science and medicine.. for more info on this check out history channel they have a special on the machines and technology of the temples( haron a greek inventor notebooks were found ( hidden by his descendents when the church came into power and burned all the knowledge of the ancient world)

greek fire...., the use of biological weapons

libraries!!!! the library at alexandria is still one of the largest and most prominent library in the world( the ptolemies a greek ruling class of egypt built it)

theatre! the plays and theatre greek tragedies, and the architecture fo the theatre is still used today

writing.... homer's the illiad and the odyssey are some of the world's first written books.

the phalanx war tactic by the spartans was used until modern day ...

advancements in weaponry

they had early contraceptives...

an academic approach to reason the modern concept of liberty spartan six-packs