Roman soldiers broke into Archimedes' house and saw an old man burying his head in the geometric figure on the ground (another saying is that he was painting on the beach). Archimedes didn't respond to his arrival. The soldier waved a knife in front of him, but Archimedes didn't respond. I saw that he didn't run away, but said to the soldiers, you are waiting to kill me. I can't leave the world with an incomplete formula! The soldiers killed him before he finished speaking. He died with regret.