FAButzke: Exactly. But I don't think we can answer that yet.
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There are many assumptions passed as facts in science (a lot less than in religion, mind you, but let's not go there =D ).
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I think we don't know much we claim we know. We like to think we do, but we don't.
There are so many mysteries (here on Earth and in the Universe) that every question answered rises other ten questions. =)
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Hey, you don't believe in Troll Aliens???? How dare you! =D
Maybe the whole "we're part of a giant computer simulation" theory is real! 0.o
(Silliness aside, it does make some odd sort of sense. It might be an answer as to why/how so much came from so little, why some matter is "dark"[think protected files/databases/etc], etc)
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Imo atheism/science is just another "faith".....but instead of putting faith in religious dogma one puts faith in scientific theories instead.
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It all boils down to our fear of/trying to explain the unknown as best we can with what we have available to us.
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I wonder if aliens have their own version of 4chan/trolling culture? :|