got frost bite on my nose and ears but we put a lot of tile and effort in making the things as safe as they can be. that's the point, someone has to do this. bill: is there a challenge out there that you would like to get that you haven't had yet? >> absolutely. bill: tell me one. >> i'm constantly learning every day. i've been watching closely what's going on in the gulf now. that is an amazing scene developing. it's a tragedy and my heart goes out to the people involved in it, but there's a lot of incredible engineering happening on the fly to fix that. bill: that's a great point. t. boone pickens said the same thing sitting in that chair yesterday. you said about tonight's premiere, if you think ride ago ski lift is scary, you should try building one. later tonight, national geographic, premiere, 9:00 eastern time, check it out. good luck. good luck with the frost bite. nice to see you sean. martha, what's coming up? martha: u.s. attorney general eric holder is set to take questions on the times square terror suspect, faisal shahzhad.