The fifth book in David Feldman’s bestselling Imponderables® series, packed with even more answers to perplexing questions and solutions to everyday mysteries Culled from the thousands of letters submitted by desperate fans, Do Penguins Have Knees? answers 100 new and even more perplexing questions about food, popular culture, the human body, science, and more, such as: Why are the oceans salty? Why is Rhode Island called an island when it obviously isn't an island? Why aren't there plums in plum pudding? Why do fish float upside-down when they die? And more! With over 190 irresistible entries and charming illustrations by longtime Imponderables® collaborator Kassie Schwan, Do Penguins Have Knees? is an Imponderables® classic.