Suppose you’re given a message to be delivered to a specific person as fast as possible. Here’s the problem, though: you don’t personally know the recipient; you don’t have their address, only a general location; and they’re far away enough that personally going there and wandering about shouting their name is out of the question. What do you do? The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Well, maybe you do the best you can. You don’t know the person on the envelope, but you know somebody in their city – perhaps that person can get the message there. At the very least, they can get it to another person, even more likely to know the end reader. Eventually, the message should get there, right?

Perhaps you’d pass such a plan off

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