thank you thank you very much for the warm introduction it's an honor to be here and participate in this lecture series I want to first clear up any possible misconceptions I have one kid just one and he has one head this was this two-headed thing was taken with photo booth on the iPad and it's his favorite thing to do is to take pictures of himself with two heads so anyway that's impossible and he's thinking about it okay all right all right okay so so I have two goals for this talk and they're kind of conflicting a little bit so the first