What matters to you.
0:00
0:00
NEXT UP:

Episode 12, Season 2<br> The Evolution of the Heart (A Love Story)

Season 2 Episode 12

About the Episode

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: 02/13/19 | Expires: | Runtime: 9m 00s