I am a retired gastroenterologist currently with many gaps in my “to do” schedule. I spent time learning the Krebs Cycle and other relevant facts at the University of Southern California Keck School of Medicine, discerned the subtle differences of S3 and S4 heart sounds at University of California, San Diego and was educated in the art of endoscopic polyp removal at University of California, Irvine. This is my first blogging venture in the world of the retired doctor. Bear with me: this is self-taught.