"I am not a hero. I just happened to be in the right place at the right time."

"It is not the man who first sees a thing who is the discoverer, but he who sees into a thing."

"The world is full of interesting things. You just have to look for them."

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

"The public will probably never understand the difficulties that beset the path of the original investigator."