Sharks have been evolving for more than 450 million years, developing skeletons not from bone, but from a tough, mineralized form of cartilage. These creatures are more than just fast swimmers—they're ...

The evolution of the shark is not what most people would expect. Instead of sharks evolving from a massive predator, the original creature was a small, leaf-shaped fish. This fish lacked eyes and fins ...

Long before highways cut across the Ozarks and rice fields spread across the Delta, the ground beneath Arkansas was part of a vast ocean floor. At different moments in deep time, that seafloor hosted ...

More than 300 million years ago, much of what is now Arkansas lay beneath a shallow sea. Today, that ancient seafloor has ...

An X-ray nanotomography reconstruction of the intermedial cartilage of a blacktip shark. The colors indicate the thickness of the struts, with red representing thicker areas and blue indicating ...