With his famous statement ” Give me a place to stand and I’ll move the world”, Archimedes was known because of his studies in the science of mechanics. But Archimedes was not just a genius but also a hero. Using his mind, he defended his hometown(Syracuse) against Romans by inventing weapons and making a huge system of mirrors that burned the Roman ships by concentrating the sun rays on them.
Galileo became famous for his studies on the laws of falling bodies and the laws of motion. Well I guess modifying the telescope which was first made by Hans Lippershey was his best idea. He used it to view the heavens and saw what no one has ever seen before like Milky Way is actually composed of stars, that the moon was not perfectly smooth and that it had mountains and craters.
The Spartan king who sacrificed himself and three hundred fellow Spartans to the Persian march on Athens and permit the other Greeks to complete their military preparations against King Xerxes and his enormous Persian army. I think they did not just delayed the arrival of the Persian army but they had killed almost the half of it considering the fact that they were losing on numbers. The Spartan army which consisted of 300 men led by Leonidas was so Amazing!!