Gr 4–7— Did you know sharks are born with a complete set of teeth? Or that they have eyelids? Or that scientists are studying Greenland sharks to see how they live so long? Even if students already know these fun facts, there are hundreds more in store in this overview of one of the world's apex predators. This short book organizes its facts by categories like "Colorful," "Mega," "Graceful," or "Superpowered." Also, there are categories like "High-Tech Facts About Shark-Inspired Technology" "Pop-Up Facts About Sharks in Pop Culture," and "Important Facts About Saving Sharks." There are pages dedicated to famous sharks like hammerheads and great whites but also lesser-known sharks like angel and dogfish sharks. Lots of clear, crisp pictures are sometimes overshadowed by the text, but to fit all those facts into less than 100 pages requires lots of words. Some facts are very easy to understand; some are incredibly technical with large scientific terms. The last nine pages are dedicated to a glossary, list of types of sharks, and an index. VERDICT Great for curious ocean-explorers-to-be, and answers over and over the age-old question for kids everywhere—Why?— Jessica Durham