A friend of mine has me wrapped in a game where we try, to the best of our intellectual abilities, to list the things that you can eat and cannot eat. This isn’t about nutrition; this is about what you could theoretically get in your mouth. For example, we say you could eat lava. You would die, but you could eat it. You can eat a nose, but a nostril really is a hole. Holes are nothing really—spots of nothing amidst something. Can you eat nothing? Can you eat a nostril?