Airless tires could change the way cars roll.
There are all sorts of things that can go wrong with a car. Sometimes those things are annoying and expected like a worn windshield wiper or burned out headlight, but sometimes those things are dangerous. Problem with your brakes or steering are frightening and life-threatening.
The terms “balls to the wall” “big brass balls”, and “balls out” have a lot to do with engines and nothing to do with mens’ anatomy.