Hardcover
(READERS DIGEST YOUNG FAMILIES, Aug. 16, 1993)
The "I Wonder Why" series answers questions about transportation that children ask such as: Why don't trains fall off the rails? / Which is the smallest boat? / Why do cars need gasoline? / Why don't ships sink? / What happens inside a car's engine? / Who cycled over the sea? / Which are the biggest tires? / Which is the fastest car? and much more intersting questions and answers that will fascinate your child ( and maybe even you).