Would you like to know how germs were discovered? Who found the first antibiotic? Who first described blood circulation? How scientists discovered DNA, and insulin, etc…? If you are curious, then read this series. These are some of the stories about the most important medical discoveries ever made, which have saved millions and millions of lives. These extraordinary discoveries are not a simple matter of luck or talent; they are the results of tenacious hard work and never-ending curiosity. Like Louis Pasteur said, Chance favors only the prepared mind. There are still many medical mysteries awaiting you to solve. You, as a young doctor, can make a difference and can save more lives. This book is about the discovery of vitamins. It is also about young people just like yourselves, who never gave up.