Thirteen achievements in medicine: Andreas Vesalius's anatomical charts -William Harvey's breakthrough on blood circulation -Karl Landsteiner's identification of blood groups -The development of anesthesia -Wilhelm Roentgen's discovery of X-rays -Louis Pasteur's establishment of bacteriology -Frederick Hopkins's recognition of the importance of vitamins -The discovery and isolation of penicillin -The development of sulfa drugs -Edward Jenner's invention of vaccine -The discoveries of insulin, oncogenes, and the human immunodeficiency virus (HIV)