protecting against the attacks is impossible because there's so many potential targets. you can protect obviously very high profile events, very symbolic target you but then run into the problem you protect those and there are a lot of others to go after. the really, the key is peers and family members. again and again when law enforcement looked at this the people who know the most about radicalization and plot planning are peers and family members. getting them to come forward which is not that easy is the way to stop this. >> always a font of wisdom. thank you very much. next, global lessons on how to memorialize a troubled shameful past without lion nicing the perpetrators. what the american can learn from all places, germany. i switched to t-mobile, kept my phone-everything on it- -oh, they even paid it off!