The best preparation for acting is life - observing life and people and observing yourself. All that becomes your library. So when you have to research a part, a scene or an emotion, you go into the library and get what you need.
“Space exploration is important research to our economic and national defense, and America's space program is a symbol of our success as a scientifically and technologically advanced nation.”
“First I shall name the eagle, of which there are three species: the great grey eagle is the largest, of great strength and high flight; he chiefly preys on fawns and other young quadrupeds.”