Dimetrodon—the dinosaur that wasn't really a dinosaur! Explore the facts about an animal that lived before the Jurassic era with a fact-filled video from Brain Scoop. The narrator shows dimetrodon's characteristics, its common...

It may be difficult for some humans to walk and chew gum at the same time ... but reptiles can't breathe while running at all! Compare the skeletal systems of reptiles and mammals in the first installment of Brain Scoop's fossils and...