~xkcd | Bookmarks (51)

The zoo takes special care to keep kings separated from opposite-color pieces as part of their conservation program to prevent mating in captivity.

You don't want the nitrogen percentage to be too high or you run the risk of eutrophication.

I don't dig pit traps and cover them with sticks and a thin layer of leaves nearly as much as I expected; I find a chance to do it barely once a month.