One sometimes finds what one is not looking for
Scottish biologist, physician, microbiologist, and pharmacologist. His best-known discoveries are the enzyme lysozyme in 1923 and the world's first antibiotic substance benzylpenicillin (Penicillin G) from the mould Penicillium notatum in 1928.
The journey of a thousand miles begins with a single step
It is the lone worker who makes the first advance in a subject; the details may be worked out by a team
Happiness in intelligent people is the rarest thing I know
Either write something worth reading or do something worth writing
To be, or not to be: that is the question
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