A movie-goer's concept of prison economy is likely that it's a cigarette-fueled barter system. That may be part of it, but it only scratches the surface. The truth is a violent world of sex, drugs and... postage stamps?
A thoroughly scientific study by sociological journal Cosmopolitan says 20 per cent of women prefer Facebook over carnal activity. This number sounds low to me. In our era, Facebook's made almost everything enjoyable and worthwhile about sex obsolete. Let's get poking.
Human space travel! Already difficult because of the gnarly technology and expensive £$€ it costs but even more difficult because humans just can't stay alive long enough for interstellar trips. We need to, like, have sex to procreate and raise kids and stuff.