Richard Feynman — "If you thought that science was certain — well, that is just an error on your pa…"

"If you're going to be a scientist, you don't need to be a genius. You just need to be able to work hard and be curious."

"The principle of science, the definition, almost, is the following: The test of all knowledge is experiment. Experiment is the sole judge of scientific truth."

"I have often thought that if I were to be reborn, I'd like to be a biologist."

"It doesn't seem to me that this fantastically marvelous universe, this tremendous range of time and space and different kinds of animals, and all the different planets, and all these atoms with all th…"

"I'm smart enough to know that I'm dumb."