we had judge -- john hodgman last semester. we have great stuff planned for next semester already. also tonight's form is being filmed by c-span so during the question part of the forum if you would go up to one of the microphones and hopefully state your name and your question. another reason we ask you to state your name is we then go right up to the forums afterwards which you will be able to read a couple of days after the event on our web site and the last announcement is that this event tonight is cosponsored by radius which is another group here at m.i.t.. i am thrilled to be able to introduce these three. it is a different breed than we initially thought would he here because jeff howe called me up at a little past five and said his daughter was and as the father of two young kids myself i said please stay home. fortunately christina couch who writes about technology and is a brilliant journalist in her own right has agreed to fill in as the moderator. let me introduce everyone. noam cohen is the author of the new book "the know-it-alls" and that is the #tonight and i think