This 19 slide PowerPoint presentation includes information regarding the six greatest medical discoveries of the 20th century. This PowerPoint includes easy-to-follow discoveries: the genetic code, mass immunization - vaccines, cancer research, aspirin - analgesics, blood groups and transfusions, insulin and antibiotics. I have used this PowerPoint with my grade 11/12 Biology class, but it would also be suitable for younger students. Feel free to download and edit this PowerPoint. Please do whatever works best for you!