Things We Still Don’t Know about the Universe.

Dinosaurs reigned as absolute masters over earth, sea and sky for over 160 million years. How did they do it? Was it their exceptional size which made them monarchs of the planet – or was it the other way around? How did they manage to coexist? After all, there were small ones, large ones, giant ones, herbivores, carnivores… What did the very first dinosaur look like? Why did they die out? Scientists have been investigating this for over 150 years.