Although paper had been known as a wrapping and padding material in China since the 2nd century BC, the first use of toilet paper in human history dates back to the 6th century AD, in early medieval China.

                                      

Ball bearings, are probably the most common type of bearing. They are found in everything from inline skates to hard drives. In a ball bearing, the load is transmitted from the outer race to the ball, and from the ball to the inner race. Since the ball is a sphere, it only contacts the inner and outer race at a very small point, which helps it spin very smoothly. But it also means that there is not very much contact area holding that load, so if the bearing is overloaded, the balls can deform or squish, ruining the bearing.

                                      

This fascinating video shows how the Mason & Hamlin company makes its pianos. The technology of making a piano hasn’t changed a lot in the last few hundred years, it is just more easier and faster nowadays.

                                      

Ever wonder what goes into making a hockey puck? This video will show you how they are made.

                                      

The trombone is a musical instrument in the brass family. Like all brass instruments, it is a lip-reed aerophone; sound is produced when the player??™s buzzing lips cause the air column inside the instrument to vibrate.

                                      

Now workers roll the chicks to whats called “The Separator”.