When you push or pull with a simple machine, you are applying a force and doing work. And, if you get more force out of a machine than you put into it, then that machine has a mechanical advantage.

At iFixit, Carsten Frauenheim writes: It’s hard to keep track of all the different types of screws, fasteners, bolts, bits, and bobs that hold our lives together, from our fridges and phones to cars ...