In the late 1980s, paleontologist Nikolai Spassov stumbled upon fossilized animal teeth in the National Museum of Natural History in Bulgaria. The fossil had a handwritten note with an indecipherable ...

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Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. A previously ...

Today, giant pandas exist in a category all on their own. But a new study indicates that pandas are a part of what was once a flourishing collection of even larger bears. The research was conducted by ...