BOSTON - OCTOBER 5:  Dr. Jack Szostak arrives for a news conference after winning the Nobel Prize in Medicine October 5, 2009 in Boston, Massachusetts. Szostak, along with colleagues Elizabeth Blackburn and Carol Greider, won the prize for their work discovering telomerase, an enzyme which builds telomeres, and how it replaces DNA that has been worn off the tips of chromosomes. Getty Images logo Getty Images 2 months ago

BOSTON - OCTOBER 5: Dr. Jack Szostak arrives for a news conference after winning the Nobel Prize in Medicine October 5, 2009 in Boston, Massachusetts. Szostak, along with colleagues Elizabeth Blackburn and Carol Greider, won the prize for their work discovering telomerase, an enzyme which builds telomeres, and how it replaces DNA that has been worn off the tips of chromosomes.