Scientists still debate the purpose of this dinosaur's iconic horns and spiky head plate. Find out what we’ve learned about how Triceratops lived and why it went extinct. Triceratops’ enormous ...

He was sofa-size, with fat jowls framing his head like a couple ... as far from hard science as you can get, is…well, probably the purple dinosaur known as Barney. Dinosaur science was ...