there was a book about how smart crows are ; a book that showed ancient doctors using leeches and drilling holes in peoples heads ; a book about how automobile engines work ; a book about african masks ; a book about a man who sailed around the world on a raft ; a book about how to fish ; a book about how to build your own airplane ; a book about sharks ; a book about insects you can find in your own backyard ; a book about graffiti artists ; a book about how stars are born and die ; a book about amazing kites from all over the world and on and on .