Mary Roach

We exist in this weirdly schizo culture, where sex is everywhere in the media, and yet, at the same time, you don't sit down and have a conversation about what you did in bed last night with your friends. Despite the ubiquity of sex, it's still a taboo when it comes to day-to-day conversation.

There are three kinds of people in this world: 1) People who make lists, 2) People who don't make lists, and 3) People who carve tiny Nativity scenes out of pecan hulls. I'm sorry, there isn't really a third category; it's just that a workable list needs a minimum of three items, I feel.

Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.