The Invention of Penicillin, 1928

Alexander Fleming was a bacteriologist who made a chance discovery from already discarded, contaminated Petri dish in 1928. The mold that had contaminated the experiment turned out to contain a powerful antibiotic, penicillin.

However, though Fleming was credited with the discovery, it was over a decade before someone else turned penicillin into the miracle drug that has helped save millions of lives.

Sir Alexander Fleming, (6 August 1881 - 11 March 1955) was a Scottish biologist, pharmacologist and botanist who discovered Penicillin. (Photo by Universal History Archive/UIG via Getty Images)