Pensacola was the first European-inhabited settlement in what would later become the United States of America. The first European settlement in the continental United States was Pensacola, which was established on Santa Rosa Island by conquistador Don Tristan tristÃ¡n De luna Y arellano in. 1559
Alexander Fleming discovered penicillin from mold that contaminated a petri dish of Staphylococcus bacteria. Researchers at Oxford University experimented with the new mold that Alexander Fleming had discovered. Penicillin was actually discovered by mistake.
* Alexander Fleming, a Scottish bacteriologist in London, discovered penicillin by mistake when he was trying to study staphylococci bacteria in 1928. He was running experiments with the bacteria in his laboratory at London's St. Mary's Hospital, and set a laboratory dish containing the bacteria near an open window.he first large-scale penicillin-production plant was constructed under the direction of Ernest Chain (1906-1979). In 1945, the year that penicillin became commercially available, the Nobel Prize was awarded jointly to Chain, Florey, and Fleming for their work on penicillin.