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 Flemingâs discovery of penicillin is one example. It took place in 1928 when he left a culture plate smeared with Staphylococcus bacteria on his lab bench while he went on a two-week holiday. He came home to see that the culture had been contaminated by a fungus, which stopped the bacteria growing.