Do fish sleep? How do cats see in the dark? Day and night are two different worlds to a child and this book explains both of them with lively text, colorful illustrations and imaginative activities. Included are: Earth's rotation and the time of day What the Earth would look like if it didn't rotate 24 hours of activity around the globe Nocturnal animals and night vision People at work at night.About the series: Explore Your World -- a captivating interactive series for young explorers.This new series covers a wide variety of science, nature and technology topics in an innovative and interactive way. The books make use of a profusion of engaging line drawings and colorful illustrations along with delightful pullouts, pop-ups, fold-outs, transparency overlays, reveal wheels, books-within-books and more. Each page offers a surprise for young, curious readers. Lively captions featuring non-technical explanations accompany all the illustrations.