#18: Dinosaur History

We talked in a previous entry in this article about how bad we all tend to be at estimating just how distant things are from each other on the timeline of the history of the earth. But before, we were talking about the Egyptians, which is a matter of thousands of years. What if we stretch it back millions of years?

If you are not a dinosaur enthusiast, you might tend to think of dinosaurs as one big homogeneous group, all existing at roughly the same time. But there were millions of years between them: stegosaurs had been extinct for 66 million years before T-rexes came on the scene.