Florence Nightingale is born on May 12th, 1820. She will go on to revolutionize nursing. From the age of 25, she devoted herself entirely to medicine, becoming an expert in all matters of public health care, hygiene, and a recognized hospital reformer. In her nursing school at St. Thomas Hospital in London, she taught disinfection methods from 1873. This was years before the discoveries of Robert Koch and Louis Pasteur led to a broader understanding of infections. In 2020, British Prime Minister Boris Johnson survived a corona infection in the same hospital where Nightingale founded her school almost 150 years earlier. Not least thanks to the teachings of the mother of all nurses that are still the basis for medical standards today. Her birthday on May 12th is still considered "Nurses' Day" today.