Unless you’ve been a maintenance engineer for some kind of complex system that’s been running for a sustained period—whether it’s mechanical, electrical, or, in my case, software—you probably don’t truly understand just how tenuously pretty much every such system on the planet is held together. And, for the sake of your happiness and your basic ability to sleep at night, you don’t want to understand. Our civilization has brought us a great many things that look solid and polished and reliable on the surface. For your own sanity, don’t open them up and look inside. Just don’t.