Well this is certainly odd.

Today I learned that the research station on the South Pole has a mailing address. (Amundsen-Scott South Pole Station, Antarctica APO AP 96598) I also learned that amazon.com lets you enter Antartica as a country when choosing your shipping destination. So, of course, once I get some spare cash, I'm going to try and send them something, just to see if the site will accept it.
I wonder if that would actually go through...
