In 1847, a Vienna doctor discovered that handwashing with chlorine could cut childbirth deaths by 90 percent, but the medical world refused to believe him

In 1847, Viennese doctor Ignaz Semmelweis made a groundbreaking discovery: handwashing with a chlorine solution could slash maternal mortality rates by an astonishing 90 percent. He implemented this practice in hospitals, leading to a dramatic decrease in deaths during childbirth. However, Semmelweis faced fierce opposition from the established medical community. His revolutionary findings were largely dismissed because he could not provide a scientific rationale for why handwashing was so effective. The prevailing medical theories of the time did not account for microscopic organisms causing disease. Despite the overwhelming evidence of lives saved, Semmelweis's ideas were rejected, and he was ostracized by many of his peers. It wasn't until much later, with the advent of germ theory, that his work was vindicated. The scientific understanding of bacteria and disease finally validated his approach, leading to fundamental changes in medical hygiene that have since saved innumerable lives worldwide.