Imagine you’re on a cross-country road trip. As you drive through a lonely stretch of highway in Wyoming, you realize you’re running dangerously low on gas. Finally, you see a gas station ahead and you pull up to refuel. But when you lift the pump handle, you find that it (and every pump at the station) has an oddly-shaped nozzle you’ve never seen before—and it’s not compatible with your gas tank. So you’re out of gas and out of luck.