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Season 2 Episode 12 | 9m
In order to understand where hearts came from, we have to go back to the earliest common ancestor of everything that has a heart. It took hundreds of millions of years, and countless different iterations of the same basic structure to lead to the heart that you have today.
Aired: 02/14/19
Video has closed captioning.
How Earth's First, Unkillable Animals Saved the World
How Earth's First, Unkillable Animals Saved the World
When We Met Other Human Species
We all belong to the only group of hominins on the planet today. But we weren’t alone.
How Evolution Works (And How We Figured It Out)
We’ll try to explain how evolution actually works and how we came to understand it.
The Hellacious Lives of the "Hell Pigs"
There is some evolutionary method to the anatomical madness that is the "hell pig."
The History of Climate Cycles (and the Woolly Rhino) Explain
The History of Climate Cycles (and the Woolly Rhino) Explain
The Ghostly Origins of the Big Cats
Scientists have recently discovered a major clue about the origins of the big cats.
The Mystery Behind the Biggest Bears of All Time
The Mystery Behind the Biggest Bears of All Time
The ability to make and use fire has fundamentally changed the arc of our evolution.
When Giant Scorpions Swarmed the Seas
Sea scorpions thrived for 200 million years, coming in a wide variety of shapes and sizes.
