The curious minds at What If transport us to the Paleozoic Era and envision what life would be like in this ancient period.

The best places to see them include Slaughter Beach, DuPont Nature Center, Kitts Hummock and Pickering Beach, but horseshoe ...

Chicago, a small hill that looks like a prop from an Indiana Jones contains many of the world’s best-preserved, most diverse ...

The Devonian Period, roughly 416-358 million years ago, is the fourth period of the Paleozoic Era. It is known as the “Age of Fishes,” as 85% of Earth was covered in oceans. Rockport State ...

In the middle of what was supposed to be a roughly 480 million year old bedrock from the Paleozoic Era were fossils of plants, invertebrates, and vertebrates, like mammals that lived ...

During the Paleozoic Era, life crawled out of the sea for the first time, and amphibians, reptiles, and arthropods all evolved. The era ended with the Permian extinction, the largest extinction ...

Horseshoe crabs first developed 540 million years ago in the Paleozoic era, more closely related to arachnids than crabs. The amazing arthropods lived through the age and extinction of dinosaurs ...