Author: The author of this book is William Pene Du Bois. I have not heard of this author until now.
Type of Book: This book is an adventure book. The types of people that would read this book are people who like to read about adventures. Another type of people that would read this book are young kids who loves balloons.
Characters: The main characters are Mr. F and Professor William Waterman Sherman. I liked these characters because they were generous to each other and they were ambitious.
Main Ideas: One of the main idea in this book is individuality.