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by jaggederest 2748 days ago
Ringworld, for one example. Society build on unobtanium dies when a microbe learns to digest it.
1 comments
njarboe 2748 days ago
More accurately is that the society was destroyed when a fungus was introduced by an enemy civilization (Puppeteers)[1].

[1]https://en.wikipedia.org/wiki/Pierson%27s_Puppeteers

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