David Macaulay's How Machines Work uses pop-ups and award-winning illustrations to demonstrate the technology of six simple machines. Follow the mad antics of Sloth and his side-kick Sengi as they try to break out of the zoo with the help of levers, pulleys, screws, inclined planes, wedges and wheels. Brought to life through pop-ups and pull-outs meaning you can explore six simple machines, from bicycles and cranes to hammers and drills, through interactive science. Packed with engaging, hands-on activities, David Macaulay's How Machines Work will gear kids up for scientific and engineering greatness!