Wheels and axles have been around for some 7,000 years — and now you can check out how they work! In this BrainPOP movie, Tim and Moby teach you all about the science behind the wheel and axle, one of the most important inventions of all time. Discover how these two devices work together as a simple rotating machine to decrease the amount of effort you need to move something from one place to another. You’ll see why turning a wheel creates a shorter but more powerful force at the wheel’s axle, thus making things like doorknobs and car wheels go! Ready to do some wheelies?