In How Machines Work: Zoo Break!, Caldecott-winner David Macaulay uses pop-ups and illustrations to demonstrate the technology of six simple machines. The book follows the hilarious antics of Sloth and Sengi as they try to break out of the zoo with the help of levers, pulleys, screws, inclined planes, wedges and wheels.
I got to review this book, which is perfect for my girls. It explains the scientific concepts behind simple machines in ways that kids can understand, but goes into enough detail that older kids will still learn something. The illustrations make everything clear, and there are fun hands-on activities included as well. The setting of a zoo break really fits my older daughters' interest in animals, and the story was interesting enough to keep my younger daughters' attention as well. It's a great gift for any kid who has an interest in science!