on earth that would be the pressure at nine thousand meters above sea level less than on top of mt everest in order to cope astronauts have to breathe pure oxygen. even with a space suit humans can spend too long out on a space walk a normal six to seven hour stint is very tiring. and humans perspire and have to replenish fluids often they put water into their bodies and then expel it as urine that's why astronauts have to wear diapers on spacewalks. humans have one other problem in space they can't tolerate the extreme temperatures we're not directly in the sun the mercury sinks to minus one hundred fifty degrees celsius then they need to be heated but in the sun the temperature reaches over one hundred degrees so they need to be cooled by spacesuits temperature is controlled by lining it with this. tubes filled with water which can be warmed up or cooled off. a few years back one of those tubes ripped water rushed into the astronauts helmet. the more it rushed into the helmet the harder his breathing became. the astronaut was in danger of suffocating. he couldn't hear anything and could

mt. everest. e's the only one who still hofs me? >> she's in fourth grade. fourth, sixth and eighth.ren't they getting big? e.>> he's d >> the first day of school. >> mom, you'll get the class picture when those come out. >> i'm explaining to him there wi be only one first day of school for the rest of his life. then we'll never have first day of school for eighth grade ever again. >> he d nine first days of school. >> it's not the same. >> maybe you didn't get the memo. you're not cool anymore. >> i know. believe me. jake tries to remind me every day. keeping you at arm's length from this point forward. we'll see you at the wedding. it is going to be another day for a kid to be sweating it out in school. on the way in and back. temperatures will be way up into the 90s yet again. here tarlys morning, all that thick moisture overhead has led to some t relativelyck fog as well. visibility down under a mile across parts of north central virginia and near a mile from frederick and mainsburg. be on the lookout for fog early in some of the sltered valleys. 79 degrees, though, in washington

experts hope we won't only see people living longer but went to things like eighty year olds climbing mt everest and washington actually banks arts here. are a tyro would you really willing to become by amik if it meant you could live a longer life. well as you know i have a massive ego so a part of my brain of course but you know what i also paid attention when i read the and rise vampire chronicles and realize that immortality is not all it's cracked up on and i don't know if we want to have that i mean it takes i imagine it takes stamina to want to live one hundred eighty two hundred years plus you know that this isn't going to be shared with everyone it's really probably going to only go to like the top one percent who's going to be able to afford this kind of technology to begin with so that we really want the top one percent who are controlling things today so live for five hundred years really you know i'd rather not learn just finally we're finally we're in the last last gasp of already you know a generation of bad decision making and bad choices so i'd rather we move on from that but i

mt. everest and that is legal and you literally stepping over bodies of people. >> do take a satellite phonewith you when you -- >> never misses an opportunity. that is a skill. that's a skill. >> never miss an opportunity. >> but i do want to -- if there is an accident, do you worry that -- in today's society that is in some ways really risk averse that you'll be able to with stand that? that the industry would, not necessarily but. and i know it is something you've thought about and lived and worked through. >> i personally do believe people understand there is a difference between being part of the uninvolved public where you have an expectation of safety. where i don't expect that any of the planes flying out of reagan national airport are going to fall on this building. i have a high expectation that's not going to happen. and i expect that the regulatory -- the regulators at the faa are working to make sure that doesn't happen. but i think the american public understands and i think the international public understands risk in that part of why we are treating astronauts as heroes is th