How Machines Work

Explore the mechanics of simple machines by lifting levers, grinding gears, flipping flaps, and more. Join Sloth and Sengi, two zoo animals who long to be free, as they put these machines to use. Pop-up and lift-the-flap illustrations help explain levers, wheels, pulleys, and more, as the two animals comically test out their contraptions in episodic sequences. A final, foldout spread reveals their most elaborate machine yet, which resembles a roller coaster and incorporates all of the devices they have used so far.