Louis Iocona has a passion for prehistoric pieces, like the tooth of a Squalicorax or "crow shark." "Even 60 million years later they're still razor sharp," he says. Iocona shares that enthusiasm ...
The Southern Minnesota Museum of Natural History features fossils that range from 7,000 to 7 million years-old. Image: Jim Pollard/Southern Minnesota Museum of Natural History. Get the Popular Science ...
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