If earth suffers some sort of gamma-soak event that ruins the north or south hemisphere, or all the americas, or Siberia down to new Zealand, how long until there are people there who can build a pulley again?
If earth suffers some sort of gamma-soak event that ruins the north or south hemisphere, or all the americas, or Siberia down to new Zealand, how long until there are people there who can build a pulley again?
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