Consider this analogy: A tribe of a couple hundred people live in isolation, their level of technology being that of the Stone Age: They live in straw huts, every day they hunt and gather for survival, and that's it. Their most advanced technology is some wooden spear sharpened with a rock. The entire tribe regularly suffers from famine because there's so little to hunt and gather, and overall their living conditions are very poor. Then two of them put their heads together and start thinking about how they could make their own lives better. They start thinking, they start tinkering, they start developing, they start testing and experimenting. After years of this kind of work they start to slowly developing for themselves a farm where they cultivate plants and raise domesticated animals. They develop tools for this purpose, they develop better buildings and better infrastructure. It takes years and years, and it's a lot of work, but over time it starts paying off: Their cult...