"I have always been a lover of nature, and I believe that we should all strive to protect our planet."

"I think that the formation of [DNA's] structure by Watson and Crick may turn out to be the greatest developments in the field of molecular genetics in recent years."

"I had begun to think about the theory of the chemical bond very seriously in 1926, '27, after quantum mechanics was discovered and then in 1928 I published a paper, a preliminary paper, and said that …"

"I am not afraid of death. I am afraid of not living."

"The department of chemistry [at Harvard] seemed to me to be rather uncooperative in that the different professors ran their own little groups...I just thought that I wouldn't feel at home there...."