Some discoveries are made unexpectedly.
a. What is it known as ?
b. Give one example.

Explanation

a. Serendipity
b. Discovery of penicillin by Alexander Fleming. He was working on staphylococci bacteria. He once observed that in a contaminated culture plate this bacteria did not grow. He came to a conclusion that it was due to a chemical produced by the blue-green mould. Hence named penicillin because it was found from blue green mould penicillium natatum.