This little book is packed with big ideas.  The higher level thinker will enjoy this book, as well as kids who like to think about the possibilities and solutions to interesting problems.  There are 125 puzzles, questions, enigmas, and strange situations for readers to ponder.  In the back of the book, are the solutions.  I can see this book used as an opening question by a teacher, or written on the corner of a board for extra credit.  One on one or whole group, there are some really bizarre and fascinating ideas to ponder in this book.  Recommended.