BILL GREEN is a professor of Interdisciplinary Studies at Miami University in Oxford, Ohio. He first went to Antarctica in 1968 and began doing his own research there in 1980. To date he has been there nine times and has published many articles on biogeochemical processes in the pristine lakes and meltwater streams of the McMurdo Dry Valleys. He is also the author ofImprobable Eden: The Dry Valleys of AntarcticaandWater, Ice & Stone: Science and Memory on the Antarctic Lakeswhich won the prestigous John Burroughs Award for Nature Writing.