Happy Dinosaur Week! Every episode this week explores the ancient marvels that walked the Earth millions of years ago. And today we’re taking a special dive into what was going on even BEFORE these prehistoric giants existed. Can you even imagine a time so long ago? We asked paleontologist and science journalist Shaena Montanari to help paint us a picture of what was roaming the Earth before dinosaurs.

Got a question that’s roaming around your brain? Send it to us at BrainsOn.org/contact, and we’ll help you out because we’re as smart as a thesaurus!