Remember the old "Flintstones" cartoon where Fred stops his car by pressing his feet down to the ground? Though our braking method today is surprisingly similar (we put our feet down, and the car stops), it's also a bit more advanced -- thanks in part to an amazingly useful and underappreciated liquid we call "brake fluid."
Wouldn't it be nice to get some warning before a tire went completely flat? Good news -- anti-lock brakes could make it possible. But how?