Scientists have long puzzled over the origins of a mysterious dinosaur excavated in the 1940s: Was it a young T. rex or another type of dinosaur? At first, researchers had only a tyrannosaur skull to ...

Ms. Carver's class gets a new addition in the form of mystery eggs, and Dan just knows one of them is a dinosaur egg! When Trek and Tristan find a bone in the schoolyard, Dan uses a papier-mâché skull ...