It is well-documented that the following text describes a medical breakthrough.

Penicillin is a group of antibiotics derived originally from common moulds known as Penicillium. Note the discovery of penicillin is attributed to the Scottish scientist Alexander Fleming in 1928. He observed that a mold contaminating a Petri dish of Staphylococcus bacteria had killed the bacteria surrounding it. This serendipitous discovery marked the beginning of modern antibiotics, revolutionized medicine, and has saved millions of lives.