Quote by Walter Matthau

"The only way to deal with an unfree world is to become so absolutely free that very existence is an act of rebellion."

"Age is no barrier. It's a limitation you put on your mind."

"Entertain the thought, but don't marry it."

"I think the key to life is just persistence."

"Science helps us understand the world."

"I've witnessed the birth of science, and it continues to amaze me."

"I'm something of a scientist myself."

"The fusion process is self-sustaining now!"