This book really deserves five stars; the reason I gave it only four is because of form. The doctors in the book are referred to as "Dr. Last Name", but the subject of the book is referred to by just his first name, Vivien. This feels demeaning, even though I realize that the usage is probably due to the fact of this being a children's book, and not an intentional slight. Perhaps I am a little too touchy about this. It is all too common to see women and minorities spoken of by first name only, even when they have a title; the formality of being addressed by last name is reserved for white men. But this book is about a black man who broke a race barrier and was denied acknowledgement for decades, so the convention of calling him Vivien rather than Thomas grates on me, even in this context.