It was one of the Earth's momentous times. Continents collided. Volcanoes erupted. Ocean currents shifted. Species ran amok.
It's not just humans, sheep, dogs, and horses that can recognize faces.
Audio storytelling has a unique power of transport unmatched by other media.
New grassland conservancies are giving a home for the bison to roam, as they once did before going nearly extinct during the 19th century.