There are over 7 billion people living on the earth right now. Tens of millions are born and die each year. Every single one of us leaves signs of our existence in the air, water, soil -- even space.

Imagine looking back through Earth's incredibly vast history. We picture dinosaurs roaming lush landscapes, ancient oceans teeming with primitive life, and eventually, the rise of mammals leading to ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

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