MingerOne says:

Going off topic, I always hear about the problems associated with lon duration spaceflight, i.e. muscle wastage and weakening of bones, what is the reason for there having never been an experiment with a rotating structure providing artificial gravity via cenrifugal force? Is it too expensive,or that is too large to go up in a rocket? As I understand it you could use a smaller structure but spin it faster,but there is a limit at which you start to sway back and forth?
Also how much less mass would the shuttle be able to carry to space if it didn't jettison its ET,surely these would be useful for construction of large,strong structures which are at present 'waste',I even seem to remember using the ET tank is an old idea,why wasn't that ever implemented.yours sincerely chris whitlock mba97cjw@hotmail.com

Rack88 says:

eliasjordan, just send in an e-mail to the SpaceVidcasters and you could get the chance to do your own podcast here if there are topics about space that you could research for the rest of us.