Extras

    Video thumbnail: Science Trek Dinosaurs: Plates and What We Don't Know

    Science Trek

    Dinosaurs: Plates and What We Don't Know

    How has the Earth changed since the time of dinosaurs?

    Dinosaurs: Plates and What We Don't Know

    Video thumbnail: Science Trek Dinosaurs: Hips

    Science Trek

    Dinosaurs: Hips

    Look at dinosaur legs.

    Dinosaurs: Hips