On the Great Filter, existential threats, and griefers Charlie's Diary
Apr 12, 2015 . The key issue here is the nature of the Great Filter, something we .. No, not even on worlds that have water/carbon based life. .. In the genetic record this has happened not just once but four times before mammals emerged. .. Some years ago a crew of Chinese sailors got captured by Somali pirates.
Colloidal silicon quantum dots: from preparation to the modification .
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