History of the Earth

1 Episode 1 How Did The Earth Form? 2 Episode 2 What Was Earth Like 4 Billion Years Ago? 3 Episode 3 The Mystery of the Late Heavy Bombardment 4 Episode 4 Where Did Earth's Water Come From? 5 Episode 5 How Did Life Begin? 6 Episode 6 What Was The Last Common Ancestor of all Life on Earth? 7 Episode 7 Were Volcanoes The Key To Life? 8 Episode 8 Did Life on Earth Come From Space? 9 Episode 9 What Would The Earth Have Been Like Without Life? 10 Episode 10 What is the Oldest Fossil on Earth? 11 Episode 11 How The Earth Got Its Magnetic Field (And Why It Might Not Protect Us Much Longer) 12 Episode 12 What Was Earth Like 3 Billion Years Ago? 13 Episode 13 How Bad Was The Great Oxidation Event? 14 Episode 14 How Did Life Recover From The First Mass Extinction? 15 Episode 15 What Would The Earth Be Like Without Photosynthesis? 16 Episode 16 What Was The First Virus? 17 Episode 17 What Is The Other 99.99% Of Life? 18 Episode 18 What Was The Earth Like 2 Billion Years Ago? 19 Episode 19 A Tour of Earth's Ancient Supercontinents 20 Episode 20 A Tour of Earth's Ancient Superoceans 21 Episode 21 What Was The "Boring Billion" Really Like? 22 Episode 22 What Was The First Complex Life on Earth? 23 Episode 23 What Was The Earth Like 1 Billion Years Ago? 24 Episode 24 What Was The First Fungus? 25 Episode 25 Why Did The Earth Totally Freeze For 100 Million Years? 26 Episode 26 Were These The First Animals? 27 Episode 27 How Far Back In Time Could You Have Survived On Earth?