Penicillin

Penicillin is the first mass-produced antibiotic and a lifesaving breakthrough, with Alexander Fleming's 1928 discovery launching a medical revolution. This drug saved an estimated 200 million lives, a figure that is 40 times the number directly impacted by #5 The Smartphone's economic disruption. Penicillin made modern surgery feasible by reducing infection rates from 50% to under 5% in surgical wards. Its mass production starting in 1943 was 300% faster than any previous pharmaceutical manufacturing, reaching troops in World War II. This innovation is more foundational than the steam engine's energy transformation, as it directly addressed human mortality—by 1945, U.S. production exceeded 650 billion units annually. Penicillin enabled treatments for pneumonia, syphilis, and battlefield wounds, transforming public health and extending average global lifespan by 15 years. It remains a benchmark for medical miracles, and its discovery principle spurred hundreds of other antibiotics, standing as the ultimate tool against bacterial infections.