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.
  The penicillin was discovered by Alexander Fleming in the year 1928. He discovered it by chance when he was going to show some petri dishes to his former Lab Assistant D. Merlin Pryce.9 people found this useful.e didn't. Alexander Fleming discovered Penicillin but Florey and Chain developed it and also mass produced it. Fleming discovered penicillin in 1928 and Florey and Chain deve â¦ loped it during the second World War.