Frederick Griffith

Frederick Griffith was a medical officer in London. \n1928, in what is today known as Griffith's experiment, he discovered a transforming principle, which is today known as DNA. Griffith was, in fact, looking for a way to fight pneumonia in the epidemics after World War I. \nThe discovery was made in what should have been a negative control, accidentially heated to 60°C instead of 100°C, killing the pneumococcus bacteria but not destroying their DNA. \nThis scientist changed genetics.\n