I have a poster on my classroom wall that says, "Never miss a good opportunity to shut up." I often think to look to it after I have wasted such an opportunity. Today, I'm gonna shut up, and encourage you to go to my Stats page and look at the TED posting there featuring Emily Oster discussing everything you think you know about HIV and poverty in Sub-Saharan Africa.

You will find it at http://www.pballew.net/stats.html