Our names are Addison and Cassidy Hempel and we are 7 year old identical twin girls who live in Reno, Nevada. In October 2007, after a two year medical odyssey, we were diagnosed with a ultra rare and fatal cholesterol disease that affects only 500 people worldwide. The disease is called Niemann Pick Type C (NPC) and the condition is frequently referred to as “Childhood Alzheimer’s.”  NPC is ultimately fatal in childhood and we are in a battle for our lives.