"What is an axle, and how does it make life easier for us Earthlings? Join the Maker, a supersmart alien engineer, in a deep dive into axles, from wind turbines to rolling pins"--

"Inquisitive makers will love learning about pulleys and how they work thanks to the Maker, a wacky alien with a passion for simple machines! A hands-on back matter activity adds to the fun"--

"What is a wheel, and why do we need it? Answer these questions and more in this title all about wheels. A project where readers make a toy car adds opportunity for hands-on learning!"--