and gary slutkin is the founder and executive director of cure violence, a national initiative to stop violence in ten cities including chicago, new orleans and baltimore. welcome to you all. gary slutkin, we heard about the incredible rash of killings this weekend in chicago and you've studied it there as well as other places. what's going on? >> well, i think what's usually missing in the conversation around violence is it's epidemic nature itself. in other words, it's its contagious nature. we know more about violence now than ten or 15 years ago, and you never really know what gets something going. in the u.s., now, some of the cities are going up and some are not, but when it gets going, it perpetuates itself to a certain extent. that's what's happening. what is most relevant is whether you can get the right things into place to cool this epidemic, this type of epidemic down. and this is being done in baltimore and in some of the neighborhoods in new orleans and some of the neighborhoods in chicago and also in several other cities. >> ifill: i wanted to ask mayor rawlings-blake ab