http://www.kqed.org/.stream/anon/radio/quest/2008/12/2008-12-01-quest.mp3
UPDATE: Elizabeth Blackburn, a professor of biology and physiology at the University of California-San Francisco, on Monday was awarded the Nobel Prize in Medicine with Carol Greider and Jack Szostak for solving the mystery of how chromosomes protect themselves from degrading when cells divide. Blackburn was featured in this December QUEST radio report about the aging of HIV patients.