Thalies-> The philosopher , who said that the earth floats on water 
Anaxmandeo->  he stated that the earth is shaped as a cylinder and the Human evolved from the fish.
Anaximenes -> Earth , sun, moon and planets are all flat bodies 
Phythagoras-> the Phythagoras principal 
Heraclitus ->  he said that " you can not step on the same river twice "
Parmenides-> stated " the world that we experiencing is constantly changing "
Empedocles -> That all mater is made up of just four elements Earth , air , and fire 
Hippocrates-> he was a physician 
Demicritus -> all matter is made up of tiny participles called atoms 
Socrates -> he pioneered the Scocratic method of probing questions to help people to think more carefully 
Plato ->He was the founder of the School of Philosophy 
Aristotle-> He wrote the first book of biology, he classified many animals to the study of their internal anatomy. he also traced the development of the Embryos 
Lyceum-> He wrote on a wide range of subjects including physics , biology , botany , chemistry History , politics, and Geography 
he also introduced the study of reasoning and argument