not as this, that, but it worked. >> pelley: you just said "move my arm..." >> downs: yeah. >> pelleyll of the sudden? >> downs: it did. it did. it felt like my arm. it was me. you're sure i can't take this home with me? i'm ready for this arm. >> pelley: if downs is eager to have the deka arm, imagine what it would mean to chuck hildreth, who lost both arms at the age of 18 in an electrical accident. >> chuck hildreth: push the knob. >> pelley: look at that. he's been volunteering at deka for more than two years. now, it seems to me that one of the issues here would be that you don't have any feeling in this hand. so the question becomes, i mean, how do you pick up an egg? how do you pick up something that you might crush? how do you know? >> hildreth: i have a vibrator sensor here that tells me how tightly i'm grabbing things. the more intense the grasp, the more intense the vibration is. >> pelley: you know, you've set me up here with a plate of grapes. and this i've got to see, okay? so let's... let's... how do you pick up a grape without crushing it? >> pelley: no way. consider,

they're dead. >> pelley: and look how easily it's burning. >> boatner: yeah. >> pelley: straight up the hill. >> boatner: even at the end of august at 6,000 feet in the rocky mountains, this fire is just cooking right along. >> pelley: professor swetnam wanted to show us just how much has changed, so he brought us to the top of arizona's mount lemon. two mega-fires here killed everything, even the ponderosa pines. you know, i was always taught that ponderosas were big, robust trees that were built to withstand the fire. >> swetnam: yeah. >> pelley: and that, when everything else burned off, the ponderosas were still standing. but look at them. >> swetnam: the ponderosas are able to withstand the low severity fires where you get flames of maybe one to two or three feet high. but now, the behavior of these fires is off the scale. >> pelley: how much have things changed? >> swetnam: well, we're seeing century-old forests that had never sustained these kinds of fires before being razed to the ground. >> pelley: back at the battle to save ketchum, idaho, the day shift was coming off; night s

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. >> i'm scott pelley. andy rooney tonight on "60 minutes." >> kroft: this past week was a crucial one in the young presidency of barak obama. with public support for health care reform and his administration in decline, the president decided to regain control over the debate with a speech before a joint session of congress. with concessions to intransigent republicans, reinforcement for wavering democrats, and even a few specifics for skeptical citizens, the president hoped to resuscitate plans for an overhaul of the medical system. and when we spoke with him on friday at the white house he seemed confident that he had succeeded. before you made this speech there was a sense-- clearly in the press and among people in washington-- that this program was in trouble. do you think you changed some minds? do you think you picked up some votes this week? >> obama: well, here... here's a conversation i had with one of my advisors early on in this process. he said, "i've been in this town a long time. i think this