You probably do know about the white smoke vs. black smoke, but here are ten even odder facts about one of the highest profile recruitment processes in the world.
The papal recruitment process is somewhat renowned for its quirkiness.
For example, cardinals must be under 80 to vote, the new pope needs a two thirds majority to be elected and most famously, black smoke signals failure to elect a pontiff while white smoke signals success. (Although did you know that the black smoke was once produced by burning wet straw along with the worthless ballots?)
These odd facts have sunk in, but there are some even stranger historical oddities related to papal recruitment.
Here are ten favourites: