The Enemy of my Enemy

Here is the third article in Steve Strogatz's mathematics series in The New York Times.

We actually went through Frank Harary's social balance proof in our networks journal club a couple of years ago.

Also, I was wondering how many articles in the series that it would take for Strogatz to get into networks. I suppose that's kind of like answering how many licks it takes to get the chewy center of a Tootsie Pop? (I hope somebody else remembers that.)