In Levers, inhabitants of Mammoth Island have decided to enter their mammoth in a "heaviest mammoth" competition. To do so, they need to find the best method to weigh a mammoth. After observing some children playing on a see-saw, Olive, a young islander, is inspired to try a simple machine called a lever to get the job done. The Islanders then explore the properties of the three classes of levers and discover that scissors, nail clippers and tweezers are just a few examples of useful inventions based on the principle of the lever!