How is Hedy Lamarr a hero?

Hedy Lamarr is a hero because she was caring and a determined person in her lifetime. Hedy was a caring person because she wanted to help World War II, which she succeeded with by creating an invention that prevents enemies from hijacking ships and submarines.

How did Hedy Lamarr help the war effort?

In collaboration with composer George Antheil, Lamarr patented a “Secret Communication System” designed to keep Nazis from intercepting Allied transmissions during World War II. ... Together, the duo filed a shared patent for an invention that prevented signals transmitted over radio from being intercepted by the enemy.