Known as the "king of the tyrant lizards," T-Rex was one of the largest carnivores of all time.

Get the full story behind the extinction of the mammoth species that once roamed the earth.

Dinosaurs can reveal fascinating details of how life was 65 million years ago. But unearthing them can prove to be challenging.

Salt—necessary for human life—was once a highly prized commodity that could not be easily accessed in many parts of the world.