Kristi Curry-Rogers wants to understand how dinosaurs got to their gigantic sizes. Follow her on her journey as a paleontologist as she looks for fossilized dinosaur bones and then analyzes the bone tissue to see how fast the animal grew. Like tree rings, bones show a record of growth rate. Curry-Rogers discovered that unlike modern reptiles, dinosaurs grew quickly, an evolutionary advantage for young dinosaurs living amongst huge predators. [6:01]