dr. tom barth and dr. cindy bir. >> thank you for being with us this morning.er, have you ever attempted to do this before and you said you have. this took over four years to plan. why did you want to crash a plane? >> we were -- i was approached by a production company to do this about four years ago. i think tom and i were approached about the same sometime. and was just such an interesting project. i didn't attempt it before, but it was attempted back in '84. and they had lessons learned. we have new technology. so, it was a wonderful opportunity for us to be able to try something like this. and get some really important scientific data from it. >> walk us through it. how do you go about crashing a plane by remote control? >> well, there was a group of pilots that organized it and set up a remote control system and a parachuting plan to make sure they had control of the airplane and make sure they could get out so that they could get it on approach and get it the right attitude to crash. what we were interested in was having the appropriate angle and have th