Oliver Olson’s problem is over-protective parents. When his third grade teacher opens a space unit by asking, “How many of you would like to walk on the moon?”, Oliver doesn’t raise his hand. “Oliver’s parents would never let him walk on the moon. The moon was too far away. It was too cold. It didn’t have enough gravity. The rocket might explode.” And when his teacher announces that the whole class is invited to a space sleepover at school, he knows he won’t be allowed to go. Ever since Oliver was a sickly preschooler, his parents have worried about him too much.