''It was a lucky break.'' That is an amazing way for a 12-year-old to describe a broken leg that led to the discovery of her malignant bone cancer. Her name is Julia Wagner. And two days before she entered the seventh grade last August, she was jumping with her brothers on their trampoline when she fell off and completely snapped her leg. When the doctor examined her X-ray, he discovered an even greater danger needing medical intervention – a bone tumor at the very point of the fissure. Like a needle in a haystack, it was a miraculous find through...