Who dipped Achilles into the River Styx to make him nearly invincible?

Thetis

What film featured Russell Crowe as mathematician John Nash? In "Apex Legends," what is the name of the playable Legend who can create dimensional portals? Which river flows through Vienna, Austria? Which grain is traditionally used to make Japanese sake? What is Leonardo da Vinci's famous sketch of the proportions of the human body called?