It's not that I can't use Google , it's that I am too ignorant to assess the relative importance/reliability of the answers it gives me. Also, I'm not sure how much of what I see is suspect as causal oversimplification or sloppy thinking. I can't even choose a category for this post, because I'm not sure if this question falls under "science and nature" (some overriding physical law?) or "society and culture" (cultural preferences?). Why don't we all have hobbit doors So hivemind, what say you?