Book excerpt: When the daytime and nighttime animals on Earth get tired of Sun and Moon's constant bickering over who should rule the world, they hold competitions--a cookout and a race--to determine the winner once and for all. But when neither the "night" team nor the "day" team wins in a fair way, how will they fix their problem? This beautifully illustrated story teaches kids respect for nature's rhythms and each other. It includes a guide that helps parents and teachers explain the science of Earth's day-and-night cycles in simple language.