August 23, 2019 • 10m
For nearly 4 billion years, the continents of Earth were lifeless. But during the Ordovician, there was an explosion of life benea...Read more
August 23, 2019 • 10m
Life in the sea rebounded with a vengeance in the Devonian. Dozens of monstrous predators emerged, like the 40-foot long Dunkleost...Read more