"One good thing...@65K feet there's always sun. By the way do you have a link to the article from Pop Science. Thanks" glex: Are you positive that that there is always sun? Then why are they making such a big deal about it in the Popular Science Article? I have a subcription to the magazine, offhand I don't know the link. You might try their website or Google? I checked a couple of stores locally (CVS & Quick Check). I could not find the magazine on the rack. You may have to go to a magazine store to get it?