The secret weapon that let dinosaurs take over the planet | Emma Schachner

We've all heard the theories on how the dinosaurs died -- but why did they come to dominate the earth for so long in the first place? (Hint: it has nothing to do with their size, speed, spikes or fantastic feathers.) Travel back in time to 200 million years before their extinction with paleontologist Emma Schachner for a breath of fresh air on dinosaur history.