By Ellie Cole Special to The Gazette -This is the fourth of 20 profiles about The Gazette's Best and Brightest Class of 2015. Not many soon-to-be high school graduates can say that Taylor Swift has tweeted about them and a blog they wrote. But not all soon-to-be high school graduates are as driven to fight pediatric cancer as Isabel Song. Song has known she has wanted to be a doctor for children since she was younger because her little brother was sick for a long time when he was a child.