History of medicine
There is evidence of traditional Chinese medicine from the Zhou Dynasty, and of Ayurveda in India from the same time. Ancient Greek medicine seems to have developed slightly later. Hippocrates and his followers were first to describe many diseases and medical conditions. Galen's theory of humors came  from ancient medical works and it was a powerful influence on Western medicine until the 19th century.  There were thought to be four humors, or bodily fluids that are linked to illness: blood, phlegm, yellow bile, and black bile.    Herophilos at the medical school of Alexandria developed the study of human anatomy by dissection.    With Erasistratus he mapped out the course of the veins and nerves across the human body and studied the brain.   Ancient  Romans invented many surgical instruments, such as forceps, scalpels, cautery, cross-bladed scissors, the surgical needle, the sond, and speculas.