Sept. 29, 2006: Elizabeth Blackburn, a scientist from Tasmania, Australia, found a protein that determines the life span of cells, so crucial to the study of aging, stress, cancer and many other diseases. Her discovery led to her winning the 2009 Nobel Prize in medicine. NBC's Robert Bazell reports.
epa01887054 A file picture dated 13 March 2009 shows Australian biologist Elisabeth H. Blackburn and US biologist Carol Greider , two of three Nobel Prize in Physiology or Medicine 2009 Laureates. The Nobel Prize in Physiology or Medicine 2009 is awarded 'for the discovery of how chromosomes are p