Who was Sir Alexander Fleming? Sir Alexander Fleming was a famous scientist who was responsible for developing the medicine called penicillin.

Fleming, Sir Alexander (penicillin)

Sir Alexander Fleming.

Sir Alexander Fleming, who died in 1955, was a famous British scientist. He is most famous for inventing the antibiotic substance penicillin using a mould (fungus) called Penicillium. He was awarded the Nobel Prize for this discovery along with two colleagues.

Penicillin was the first antibiotic and saved millions of lives.

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