Synapsids were the world’s first-ever terrestrial megafauna but the vast majority of these giants were doomed to extinction. However some lived on, keeping a low profile among the dinosaurs. And now our world is the way it is because of...

From the Archean Eon to the Holocene Epoch, check out this SciShow mini-series for a primer about life on earth.

The Great Dying hit life hard, but the species that survived took over the planet and diversified into many interesting forms, including the dinosaurs!