Dear Humans,

Some paleontologists published a paper this week that claimed Tyrannosaurus Rex is not one species, but three. Other paleontologists disagreed. 

Of course, nothing changed about the T.rex. All that’s changed–or is currently being challenged–is our ideas about the T.rex. And, when it comes to a species (or species-es) that has been extinct for over 65 million years, our ideas are all that we have.

Sue–the most complete T.rex ever discovered–is still only about 90% made up of real fossils. And paleontologists are always changing how they arrange those fossils because they’re constantly making new discoveries about what the T.rex looked like and how it moved.

Though the world has changed a lot during my life (I walk around with a computer in my pocket!), it sure seems like the past has changed even more.

Sincerely,

Mr. Curt