"I know I have a purpose in life."
Hannah Hartley, an 18-year-old, recently celebrated a birthday that she wasn't supposed to have. At birth, she was diagnosed with a severe form of muscular dystrophy and was given a year to live. In October, she turned 18, and with that defied all of the odds that have been against her since birth. Today, she may live a life unlike most teenagers', but she does it with optimism, happiness and a tremendous sense of humor.