In October, Stan, one of the most famous T. rex fossils in the world, sold at private auction for a jaw-dropping $31.8 million dollars. We don't know who the buyer was, which would suggest that it's going into a private collection, which also means it'll most likely be lost to scientific research.

We talk with Dr. Darla Zelenitsky, a paleontologist and dinosaur researcher, about how the fossil trade is a growing problem for researchers and museums around the world, and how it's only getting worse as sales like Stan's drive prices up.

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