This book takes on the challenging task of explaining big ideas in a simple way, and it does an admirable job. Readers as young as eight or nine will be able to follow along and contemplate questions about topics such as the nature of reality, personal identity, ethics, and social justice. Along the way, they're presented with historical context and biographical information about specific philosophers. Although there's a lot of information and intellectual discussion in here, it's presented in a way that is child-friendly, neatly organized, and not at all inimidating. Subheadings divide the text into paragraph-sized chunks. These are interspersed among colorful pictures and graphics. Each double-page spread is headed with a question like "How do I know if I am real?" or "Can we think without language?" (except for a few which are headed with an individual philosopher's name or the title of a thought experiment) Throughout the book, the language is concise and jargon is kept to a minimum.
I do have couple minor quibbles about the organization of topics towards the end of the book. I felt that the jump from personal ethics to human rights was very abrupt, and then it felt like backtracking when the book moved on to the discussions about government and society. These deliniations would be much smoother if there was more space dedicated to asking questions about basic needs and human rights. (Do all people need the same things? What does it mean to be free? What does it mean to have rights? Do all people have the same rights?) These topics are all addressed so briefly that it feels like we're suddenly being asked to make assumptions about morality and equality, when it's been all quesetions and no assumptions up to that point.
But overall, this book is a wonderful overview of philosophy. It's fun and easy to read, it's informational and educational, and it encourages kids to ask questions and develop critical thinking skills.