Episode 1
How Did The Earth Form?
May 9, 2020
An overview of fractionation, Mara's survival, 'Grand Tack' theory, formation of Mercury, solidifying Earth, and theories surrounding Theia.
Episode 2
What Was Earth Like 4 Billion Years Ago?
May 23, 2020
Episode 3
The Mystery of the Late Heavy Bombardment
Jun 7, 2020
Episode 4
Where Did Earth's Water Come From?
Jun 14, 2020
Episode 5
How Did Life Begin?
Jul 4, 2020
Episode 6
What Was The Last Common Ancestor of all Life on Earth?
Jul 11, 2020
Episode 7
Were Volcanoes The Key To Life?
Jul 18, 2020
Episode 8
Did Life on Earth Come From Space?
Aug 8, 2020
Episode 9
What Would The Earth Have Been Like Without Life?
Sep 2, 2020
Episode 10
What is the Oldest Fossil on Earth?
Sep 25, 2020
Episode 11
How The Earth Got Its Magnetic Field (And Why It Might Not Protect Us Much Longer)
Oct 11, 2020
Episode 12
What Was Earth Like 3 Billion Years Ago?
Nov 22, 2020
Episode 13
How Bad Was The Great Oxidation Event?
Dec 20, 2020
Episode 14
How Did Life Recover From The First Mass Extinction?
Jan 6, 2021
Episode 15
What Would The Earth Be Like Without Photosynthesis?
Jan 31, 2021
World Without Photosynthesis
Episode 16
What Was The First Virus?
Feb 24, 2021
Older Than Life? Evolution of Viruses
Episode 17
What Is The Other 99.99% Of Life?
Apr 8, 2021
4 Billion Years of Life: Tour of the Biosphere
Episode 18
What Was The Earth Like 2 Billion Years Ago?
May 16, 2021
2 Billion Years Ago: After The Great Flood
Episode 19
A Tour of Earth's Ancient Supercontinents
Jun 26, 2021
Before Pangaea
Episode 20
A Tour of Earth's Ancient Superoceans
Jul 31, 2021
Exploring Earth's Prehistoric All Sea
Episode 21
What Was The "Boring Billion" Really Like?
Oct 17, 2021
1.8 to 0.8 Billion Years Ago: Earth's Lost Billion Years
Episode 22
What Was The First Complex Life on Earth?
Nov 30, 2021
Earth's Impossible Fossils
Episode 23
What Was The Earth Like 1 Billion Years Ago?
Feb 18, 2022
One Billion Years Ago: Is This Eden?
Episode 24
What Was The First Fungus?
May 30, 2022
The Key to Life? Evolution of Fungi
Episode 25
Why Did The Earth Totally Freeze For 100 Million Years?
Aug 31, 2022
Snowball Earth
Episode 26
Were These The First Animals?
Dec 14, 2022
The Ediacaran: Life's Failed Experiment?
Episode 27
How Far Back In Time Could You Have Survived On Earth?
Jun 9, 2023
How Far Back In Time Could You Have Survived On Earth?
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