much to do that it doesn't even have time to make his american colleagues helping out the north peggy whitson stay here was extended so no she'll be working together with jack. mutual. good to go and you said it was a good. you need to just. push and push it to your religion. this experiment is the most delicious one the lettuce was grown at 0 gravity and then of course eaten they carry out biological and physics experiments study the performance of stem cells and develop medicines to cure cancer this experiment is the most important one for jack fisher as his daughter had cancer. but spaceman also guinea pigs mission control constantly monitors their health and watches closely to see if they exercise enough. we have a special treadmill 1st off we can find it's although we have to work out physical exercise. to do 2 and a half hours a day because if you don't have good exercise your muscles and your bones just just go away and you come back as a 90 year old man and then you your wife like you anymore. that's the answer. to some crude for. the most news in the worst or the reporting of a movem

his american colleagues a helping out faster nor peggy whitson stay here was extended so now she'll be working together with jack. good to come on news or good news was good news dogs enjoy. would you please. this experiment is the most delicious one the lettuce was grown at 0 gravity and then of course eaten they carry out biological and physics experiments study the performance of stem cells and develop medicines to cure cancer this experiment is the most important one for jack fisher as his daughter had cancer but space also guinea pigs mission control constantly. it is their health and watches closely to see if they exercise enough. we have a special treadmill 1st off we gotta find it's all that we have to work out physical exercise. to do 2 and a half hours a day because if you don't have good exercise your muscles and your bones just just go away and you come back as a 90 year old man and then you your hot wife like you anymore. that's the answer. to. this in this book in the soup and keeping them honest with the poor in the meantime before you. in europe a neutral in this change

. >> reporter: on the other hand, former astronaut peggy whitson sometimes misses space. >> after myghtest push on my bed and expected to float to the bathroom. and i was, like, oh, my, it is going to take a lot more work to get there than that. >> reporter: she spent more time up there than any other american. what is the grand total of days you were in space? >> 665 days. >> reporter: that's like g m prt isble. >> reporter: 20 years of sace station science has yielded hundreds of breakthroughs in weather, aft tron me, and epecially medicine, alzheimer's, cancer, heart disease, and so on. >> the salmonella that gives you food poining,it becamn space. and they could develop a vaccine for that. >> reporter: and worms and mice and rats were also in space. they seem t to like it just fine. >> we can better understand how things work in gravity. >> reporter: but for the humans on board, seeing our home from space is always spectacular. >> you look out the window and you see planet earth, and you see how thin this atmosphere is and how delicate it looks. if you happen to be near a window