some logistics c-span's here tonight so please turn yourself phones off and this is for sean and others who've been here before we have a running a business here so thank you for being here and some might ask for an cappuccino or espresso but [inaudible] [laughter] i also encourage you to buy a cup of coffee or tea. when we are here [inaudible] please support them. when you have questions to ask the end of the talk, we are going to have a very interesting kind of microphone come over to do so that the c-span people can hear you when this is being broadcast. please hold your question until this big thing is brought to you and you can start. [laughter] >> if you forget we will be sure to cut you off until it is there. we would like to welcome sean carroll to discuss his newest book "from eternity to here. if he would be interested the theory of relativity. >> what are you saying? [laughter] >> i don't really know about relativity actually. [laughter] but the thing -- if you are interested let me know sean was at harvard graduate school i think and then mit the rest of the next to the phys