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aquatic or subterranean civilizations would be hard to find.
the only other scenario i can think of is a deliberate attempt at two opposing factions to wipe one another from the face of the earth. this would lead back point of finding their "primitive" cultures before one destroyed the other though.
Originally posted by DangerDeath
There are many spiritual civilizations even now, which are not detected by history, because they don't belong to "history" in the first place. History doesn't include them among "civilizations".
The existing criteria for what should be called civilization only includes civilizations which have developed "state" because it only values violence and oppression as "civilized".
…a single projectile Charged with all the power of the Universe. An incandescent column of smoke and flame As bright as the thousand suns Rose in all its splendour… a perpendicular explosion with its billowing smoke clouds… …the cloud of smoke rising after its first explosion formed into expanding round circles like the opening of giant parasols… ..it was an unknown weapon, An iron thunderbolt, A gigantic messenger of death...
Originally posted by Hanslune
It''l only take a few thousand years to completely survey and dig over ever square centimeter of the earth's surface - dispair not!