I have this theory that a lot of people are secretly nerds, they just have been shamed for being enthusiastic about the thing they love. Only if it's the current consumer thing (sports, cars) it's fine. But a lot of people just think stuff is neat and have learned that it's safer to be incurious about the world. It doesn't take much digging to find that spark in folks though, and it makes me sad that they've never learned how joyous it can be to revel in the fascinating details of the universe.