How Earth's First, Unkillable Animals Saved the World
11:19
How We Identified One of Earth’s Earliest Animals
10:59
How Volcanoes Froze the Earth (Twice)
9:14
How the Egg Came First
9:35
When Lizards Took Over the World
14:13
Animals Might Be Much Older Than We Thought
10:55
When the Synapsids Struck Back
11:58
From the Cambrian Explosion to the Great Dying
9:08