Brendan Adams, a 12-year-old Ellensburg middle-schooler is the tallest kid in his class. Big deal, you say? Well, he's not just a few inches taller than his peers. He's a few feet taller. While the average height of a 12-year-old is 5' 0", Brendan now stands over seven feet tall. And he's still growing. UW and Childrens' Hospital physician Melissa Parisi has been studying Brendan for the past eight years. "I've still never seen......