What makes dinosaurs so interesting-their huge size, their exotic mystique? Or is it just that we're still learning about these strange, lumbering creatures as scientists make new discoveries and revise old theories? Decide for yourself, with Encyclopaedia Britannica Profiles Dinosaurs. Watch a tyrannosaurus running...see how you measure up to him (would you reach his knee, his back, or his neck?)...and click your way through the evolution of dinosaurs in an interactive timeline. Comprehensive and engaging, it’s the one source for all ages on this captivating subject.