From Hippocrates to Hippo 420 BC Hippocrates maintains that diseases have natural causes and puts forth the Hippocratic Oath. 420 BC 300 BC Dioclese writes the first known anatomy book. 300 BC 200 Galen defines clinical medicine based on observation and experience. 200 1249 Roger Bacon invents spectacles. 1249 1489 Leonardo da Vinci dissects corpse. 1489 1590 Zacharius Jannssen invents the microscope. 1590 1628 William Harvey publishes An Anatomical Study of the Motion of the Heart and of the Blood in Animals. 1628 1818 James Blundell Performs the first successful human blood transfusion. 1818 1895 X-rays discovered by Wilhelm Conrad Roentgen. 1895 1903 Willem Einthoven invents electro-cardiography (ECG/EKG). 1903 1953 James Watson and Francis Crick work on the structure of the DNA molecule. 1953 1954 Joseph Murray performs the first human kidney transplant. 1954 1968 Mass General clinicians pioneer telemedicine, the practice of medicine over closed-circuit television. 1968 1971 First MRI and CAT Scan developed. 1971 2001 First tele-surgery performed by Jacques Marescaux. 2001 2020 Hippo Technologies launches Hippo Virtual Care platform and pioneers Polymorphic Medicine. 2020