Author: Ariel HenleyI am ugly. There's a mathematical equation to prove it. At only eight months old, identical twin sisters Ariel and Zan were diagnosed with Crouzon syndrome -- a rare condition where the bones in the head fuse prematurely. They were the first twins known to survive it. Growing up, Ariel and her sister endured numerous appearance-altering procedures. Surgeons would break the bones in their heads and faces to make room for their growing organs. While…