Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Q: metis is the goddess of wisdom in greek mythology.

A: metis
****
Q: guido altarelli (july 12, 1941 - september 30, 2015) was an italian theoretical physicist.

A: guido altarelli
****
Q: dead calm is an american novel that was written in 1963.

A:
dead calm
****