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.
THey were discovered by DR. Alexander Fleming in 1920 it was discovered in 1940s.   Antibiotics were first discovered by Alexander Fleming in 1928, penicillin was the firs â¦ t antibiotic.