For 10 points, who supposedly ran into the streets shouting "Eureka!"
This man elucidated Heron's formula before Heron proved it. He supposedly created a death ray out of mirrors in order to defeat an invading Roman army. A task given to him by Hiero ("HIGH"-er-oh) of Syracuse led to his discovery that the buoyancy of an object is equal to the fluid displaced. For 10 points, who supposedly ran into the streets shouting "Eureka!" after discovering how to test whether Hiero's crown was made of pure gold?
This man elucidated Heron's formula before Heron proved it. He supposedly created a death ray out of mirrors in order to defeat an invading Roman army.
Archimedes of Syracuse