If you're reading this sentence, you might have a fish to thank. Fish were the first animals to evolve jaws. They use their jaws primarily to eat, but also for defense, as tools—such as to burrow or ...

A study published in the Nature journal alters how the evolution of fish has been historically understood. Fossilized fish and other sea creatures have often been pivotal in new scientific discoveries ...

Beneath the surface of eastern North America are countless freshwater caves. Deep, dark, and closed off from the surface, these landforms are difficult to study and difficult to date, with their ages ...