http://kirjabloggaus.blogspot.fi/p/espoo-11-may-2018.html
Kimmo Huosionmaa
https://sites.google.com/view/espoo1152018/etusivu
http://kirjabloggaus.blogspot.fi/p/espoo-11-may-2018.html
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Great filter: Are all civilizations already dead?
The Great filter is the point at which civilization must pass certain tests. That. It can travel to stars. And if the civilization can reach...
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