How Old are Polar Bears?

You’ve probably heard the news: Polar bears have been around a lot longer than we thought. “About 600 (338 to 934) thousand years” in fact. The research used to determine this involved molecular clocks, however, which has prompted an article by Brian Thomas: Circular Reasoning in Polar Bear Origins Date. Brian has incorrectly accused scientists of this fallacy before – what is it this time?

Polar bear skeleton
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