Children's questions reflect a philosophical subtlety that is often not fully appreciated. Their stock question: "what's that"? can be equated with Plato's own presumed stock question: "what is x"? (x=justice, virtue, good, love, etc.). As well, their other nagging question: "why"? can be construed as a quest after immediate and ultimate reasons and clarity in the construction of their own edifice of knowledge. These and their other philosophical approaches to their common experiences are discussed in this book.