Calvin Didn't Know addresses African-American History in a very engaging, non-combative, fun manner. As the reader becomes more involved in the story, he discovers interesting facts about day-to-day inventions of African-Americans. The book is designed as a reader for upper elementary and middle school students but can be enjoyed by both youth and adults. Along with the story, the book includes biographical material, a list of patent information, and a short vocabulary section. The story of Calvin began as a story told to elementary and secondary school students at African-American History...