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A complete guide to Tyrannosaurus rex—size, speed, diet, evolution, and the latest research on the king of dinosaurs.

From extinction to evolution, explore why trilobites have no living descendants and how nature repeatedly reinvented their iconic shape.

Learn about the largest trilobite fossil, Isotelus rex, and explore other giant trilobites from ancient seas around the world.

Discover Isotelus, Ohio’s state fossil and the largest trilobite ever found. Learn about its Ordovician origins, massive size, and importance in Ohio’s fossil history.

Discover the Cambrian Period through its fossils—trilobites, early predators, and the evolutionary experiments that shaped life on Earth.

Learn about shattuckite, a rare blue copper silicate mineral. Explore its properties, formation, history, and key localities around the world.

Learn about barite, a dense sulfate mineral known for stunning crystals and major industrial uses. Includes properties, formation, history, and localities.

Before dinosaurs, giant sea scorpions ruled the waters. Explore the fascinating world of eurypterids and their fossil legacy.

Explore orpiment, the brilliant yellow arsenic sulfide mineral. Learn its properties, toxicity, formation, history, and major localities in this in-depth guide.

Learn what Nanotyrannus really was, how it compares to T. rex, and why its fossils reshaped our understanding of Late Cretaceous predators.