Who lives on the Moon? (Hardcover)

When Aaron was not quite five years old, we were on a road trip in Missouri-driving past a field of cows just before sunset. The moon had come up and, out of the blue, Aaron asked if cows lived on the moon. This began a series of questions that I tried to answer to the best of my ability. It became a game. Each question gave me the opportunity to explain a basic concept related to science.