Social psychologist Phil Zimbardo—the guy behind the (in)famous Stanford prison experiment—spoke at the Cato Institute yesterday, and Will Wilkinson and I offered up some brief commentary after his presentation. It’s a great short summary of the ideas in his book The Lucifer Effect, so if you’re interested in how social situations and roles can induce normal, “good” people to do awful things, it’s worth a watch.  You can check out the streaming video or the audio in MP3 format.