What is a fact about Medusa?

Medusa was the most famous of the three Gorgon sisters.  Looking upon her face turned men to stone.  She had snakes instead of hair.

Medusa was beheaded by Perseus to prevent his mother from having to marry an evil king.  He was able to look at Medusa to slay her only through a mirror shield, given to him by Athena.  Later, Perseus gave Medusa's head to Athena who wore it on her armor.