If an industrial civilization had existed on Earth many millions of years prior to our own era, what traces would it have left and would they be detectable today?
— Fermat's Library (@fermatslibrary) April 23, 2019
This paper answers that question 👉 https://t.co/WDg7k1YhFD pic.twitter.com/tTWN4ujlJa
from Twitter https://twitter.com/fermatslibrary
April 23, 2019 at 06:10AM
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