With Build Your Own Chain Reaction Machines, you’ll create 13 zany and awesome mechanical contraptions using stuff from around the house. Provided by publisher.

Basic tools -- DIY tools -- Basic techniques -- Door knocker -- Light switcher -- Door opener -- Plant waterer -- Toothpaste squeezer -- Soap dispenser -- Flag raiser -- Marble launcher -- Music maker -- Balloon popper -- Vending machine -- Candy dispenser -- Cookie dunker.