In the first century, when it was still super underground and hipster to be a Christian, you were a secret symbol of Christianity, used to kind of hide from the Romans. Icthys, the Greek word for fish, was an acronym, and it was a super clever way to talk about religion without anyone knowing that you were talking about it. But you'll never guess what happened. Even in places where it's completely fine to talk about Christianity now and to use, you know, regular Christian symbols like the cross, you have had a huge resurgence thanks to the plastic automobile decal industry. I mean, seriously, Icthys, I haven't seen a comeback like this since Jesus. Best wishes, John Green. And lastly, Christianity was born and flourished in an empire with a common language that allowed for its spread.