They ruled the world for 160 million years, long before humans came around, and were driven extinct about 65 million years ago. But dinosaurs remain today a source of both scientific discovery and cultural wonder. They’re featured both in blockbuster movies and in the world’s best-known museums. And even after all this time studying them, we still don’t know all there is to know about these reptilian bird creatures that continue to fascinate adolescents and archaeologists alike.