"Because, if you didn't know any physical chemistry, you could look at a crystal and ask all the same questions. You'd see those beautiful spars, those perfect geometric facets, and you could ask, What's controlling this process? How does the crystal end up so perfectly formed--and looking so much like other crystals? But it turns out a crystal is just the way molecular forces arrange themselves in solid form. No one controls it. It happens on its own. To ask a lot of questions about a crystal means you don't understand the fundamental nature of the processes that led to its creation. "So maybe living forms are a kind of crystallization. Maybe life just happens. And maybe, like crystals, there's a characteristic order to living things that is generated by their interacting elements. Okay. Well, one of the things that crystals teach us is that order can arise very fast. One minute you have a liquid, with all the molecules moving randomly. The next minute, a crystal forms, and all the molecules are locked in order. Right?" "Right ..." "Okay. Now. Think of the interaction of life forms on the planet to make an ecosystem. That's even more complex than a single animal. All the arrangements are very complicated."