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We live on a green planet. Today we may take them for granted, but plants are the most important living things on Earth. Their initial colonization of land made it possible for all animal life to survive, and once the Devonian ended, the forests grew bigger and stranger. How would plants change their own bodies and the environment in this golden age?

Extensive archaeological and anthropological data suggest that the first humans entered the Americas about 15,000 years ago from Asia to Alaska. A 130,000-year-old mastodon skeleton discovered in suburban San Diego shows signs of butchery only associated with ancient humans.

Lurdusaurus was a burly, barrel-chested iguanodont that may have been semi-aquatic, living in and around the rivers of an ancient tropical forest. It moved slowly on land, measuring eight meters long (26 feet) and weighing more than five tons.