Do you know how the second hand works in your watch? How about a constant velocity joint? Well, let these awesome GIFs teach you a thing or two.
This one is the Maltese Cross Mechanism, the thing in clocks that power the movement of the second hand. And this is how a sewing machine works.
Be sure to click through and see all the rest; I wish I could learn everything via animated GIFs. [World of Technology via Gadget Lab]
