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12:04
MSN
The Why Files
Are Humans the First Civilization? The Silurian Hypothesis
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. But these signs won't last forever. Our buildings will be gone in a few hundred years. Our stone monuments, plastic, styrofoam, twinkies, even ...
9 months ago
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