The medical community is still perfecting transplant surgeries – something doctors have been working on since ancient Egypt. Paul Craddock is an honorary senior research associate in the Division of Surgery and Interventional Sciences at UCL Medical School in London. He joins host Krys Boyd to discuss 16th-century skin grafts, 18th-century tooth transplants and modern-day medical breakthroughs. His book is “Spare Parts: The Story of Medicine Through the History of Transplant Surgery.”