Ball bearings are in your car, your bike, your skateboard, all sorts of machines with moving parts. These genius little devices have been around for centuries, using the magic of physics to reduce ...

If the utility of an invention were somehow derived from the genius of its inventor, it would be pardonable that so many sources trace the idea for the ball bearing to a 1497 drawing by Leonardo da ...

If you've ever watched the Tour de France and winced as all those skinny-wheeled racing bikes bounced over the cobblestone roads ... well, you were right to do so. Not only are such hard, rough ...