"I am very grateful for the recognition I have received, but the real credit belongs to the mould."

"The future of chemotherapy lies in the intelligent use of these new antibacterial agents."

"I am not a very good speaker, but I hope my work speaks for itself."

"I never thought of myself as a genius. I just kept looking."

"The next time you are tempted to throw away a contaminated culture, remember the penicillin."