I'm not always crazy about Richard Scary books, but this one is brilliant. He has all his nutty little things going, but he just happens to slide in the explanations of how birds fly, how lift works to make airplanes fly, how jet engines work and a detailed little bit on traveling to the moon and back. Also, there are several small self-contained stories. So it's easy for my 4-yr-old daughter to pick a favorite chapter. I highly recommend this one. ( )