Alexander Fleming — "Penicillin cures, but wine makes people happy."

"It is a happy accident that the mold grew on my plate, but it was not an accident that I recognized it."

"I had no idea that I would be involved in such a great discovery. It was purely accidental."

"The accidental contamination of my cultures by a mold was not an unusual event in a bacteriological laboratory. What was unusual was my decision to investigate the mold."

"The thought that I might have discovered something which would be of value in treating disease was, of course, uppermost in my mind."

"My greatest satisfaction comes from knowing that my work has saved countless lives."