are you in my monkeysphere?

Here's an article I found very interesting, and mostly spot-on, about the reasons why we care more about our immediate friends and family than the rest of the world. Those people aren't in our "monkeysphere," the 150 or so people we can handle caring about. The rest are nameless, faceless others. The article is funny, well-written if slightly redundant, and pottymouthed.