The Silurian Hypothesis
Stuff To Blow Your Mind
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The Drake Equation - Is There a Future?
The drake equation decomposes an unsolvable problem into a series of smaller problems, at least some of which are solvable. The authors estimate that there has been complex life on earth's land surface for only about 400 million years. They say industrial civilization, in a bithermetric, has probably existed for only about 300 years. This is since roughly the beginning of mass production methods for things.
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