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Penicillin discovered by Sir Alexander Fleming

Sir Alexander Fleming was a young bacteriologist when an accidental discovery led to one of the great developments of modern medicine on September 3, 1928. Having left a plate of staphylococcus bacteria uncovered, Fleming noticed that a mold that had fallen on the culture had killed many of the bacteria. He identified the mold as penicillium notatum, similar to the kind found on bread. 

In 1929, Fleming introduced his mold by-product called penicillin to cure bacterial infections.

READ MORE: It Took Surprisingly Long for Doctors to Figure Out the Benefits of Hand Washing


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A close-up of the text of the Code of Hammurabi.

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How the Coercive Acts Helped Spark the American Revolution

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President Gerald Ford wearing a WIN (Whip Inflation Now) button on his lapel during Republican campaigns in North & South Carolina.

How Gerald Ford Tried to Fight Inflation

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King Charles III inspects the Guard of Honour as he arrives for the Ceremony of the Keys at the Palace of Holyroodhouse, on September 12, 2022, in Edinburgh, Scotland.

King Charles III

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Railroad strike destruction at the 26th Street Pennsylvania Railroad Round House, July 14-27 1877, Pittsburgh, Pennsylvania.

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The Imperial State Crown arrives for the State Opening of Parliament at the Houses of Parliament in London on May 11, 2021.

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West Point (No. 16 of The Hudson River Portfolio), 1825. Artist John Hill. (Photo by Heritage Art/Heritage Images via Getty Images)

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Illustrated bookplate of Hessian soldiers in their 1784 uniforms. Printed in the book, "Armée Hessoise" by JH Carl & JC Muller in 1805. Artist J.H. Carl, 1784.

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Willie Velasquez

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Sheriff's deputies form a line across street at Garfield High School during a Chicano student demonstration on March 5, 1968. Similar confrontations occurred at other schools.

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Celia Cruz during rehearsal for the third annual Latin GRAMMY Awards ceremony at the Kodak Theatre in Hollywood, California, 2002.

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Queen Elizabeth ll delivers her Christmas speech at Buckingham Palace on December 25, 1957 in London, England.

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The town of Unalaska, on Unalaska Island, was founded in 1700s as the first headquarters of the Russian-American Company in Alaska. A Russian Orthodox church appears in the lower left.

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Queen Elizabeth II

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