Scientists got a 70-million-year old surprise when they broke open the thighbone of a T-Rex. They had to break open the Tyrannosaurus Rex bone to remove it from a dig in Montana. And when they did so, scientists discovered soft tissue inside. Experts say soft tissue finds are extremely rare. The find is reported in tomorrow's edition of the journal Science. Researchers hope it will reveal new details of how dinosaurs lived. It could also show a link between dinosaurs and modern birds, like the ostrich, believed to have descended from dinosaurs.