Some of your body's cells have a 'license to kill'

February 17, 2009 01:56 PM

UPDATED July 08, 2011 07:29 AM

More Videos

  • Video of dad reacting to baby's shots at doctor's office goes viral

    Antwon Lee of Georgia trying to comfort his newborn son Debias King Lee as he got vaccines in October made the rounds on social media and captured hearts.