While deception isn’t just an opportunistic result of being in big groups, big groups may well be the ultimate source of deception (and by extension big brains). That’s the hypothesis of Robin Dunbar of Liverpool, as he detailed last fall in the Annual Review of Anthropology. Deception and other sorts of social intelligence can give a primate a reproductive edge in many different ways. It can trick its way to getting more food, for example; a female chimp can ward off an infanticidal male from her kids with the help of alliances. Certain factors make this social intelligence more demanding. If primates live under threat of a lot of predators, for example, they may get huddled up into big groups. Bigger groups mean more individuals to keep track of, which means more demands on the brain. Which, in turn, may lead to a bigger brain.

That’s the whole thing, right here. Life on Earth, in a nutshell. We are hard-wired to have a drastic double standard for the people inside and out of our Monkeysphere and those outside make up 99.999% of the world’s population.

Have you ever gotten pissed off in traffic? Like, really pissed off? I think we all have. We’ve thrown finger gestures and wedged our heads out of the window and screamed “LEARN TO FUCKING DRIVE, FUCKER!!” We’ve all pulled the gun out of the glove compartment and let a few fly at the offending car. Not firing at their head or anything. Just, you know, at their tires.

Now imagine yourself standing in an elevator with three other people, two friends and a coworker. A friend goes to hit a button and accidentally punches the wrong one. Would you lean over, your mouth two inches from her ear, and scream “LEARN TO OPERATE THE FUCKING ELEVATOR BUTTONS, SHITCAMEL!!”

They’d think you’d gone insane. We all go a little insane, though, when we get in a group larger than the Monkeysphere. You know the feeling, that invincibility of being an anonymous head in a crowd, screaming curses at a football player you’d never dare say to his face.