A behind-the-scenes visit to an NHL arena explores how the Zamboni became one of the most recognizable machines in sports. The video follows a rink expert as he explains how the machine shaves, cleans ...

Mechanical Advantage : The wheel and axle provide a mechanical advantage, allowing a smaller force applied to the rim of the wheel to produce a larger force at the axle. This principle is utilized in ...

How do inventions happen? NPR's Planet Money's team brings us the history of one underappreciated invention that has enabled countless other inventions, from the Phillips screwdriver to Bluetooth. You ...