How does a VCR work?

How does a Mechanical Scale work? (Spring Scale)

How does the Poppin' Pals toy work?

How does an Oscillating Fan work?

How does a Combination Lock work?

How do Window Blinds work?

How do Child Proof Caps work?

How does a Pin Tumbler Lock work?

How does a Door Handle work?

How Does a Clicky Pen Work?

What's inside of a hard drive?