What Would The Earth Be Like Without Photosynthesis?
26:33
What Was The First Virus?
31:31
Where Did Earth's Water Come From?
30:49
What is the Oldest Fossil on Earth?
42:46
What Was The Earth Like 1 Billion Years Ago?
18:59
Venus - Earth's Lost Twin
59:33
What Was The First Complex Life on Earth?
27:02
What Was Earth Like 3 Billion Years Ago?
1:31:07