Irrigation. But Iron Working and Celestial Navigation are good shouts too.
this post was submitted on 29 Apr 2024
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Copper. Because without copper, most of the named things wouldn't be possible to create!
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The time machine.
Surely it has to the FRIDGE?
Air conditioning
For people that really really need air conditioning, it's an amazing thing
The vast majority of people who have it don't need it. Especially in, ahem, that one country
It's horrendously wasteful
Writing or agriculture. Both were incredibly important in developing society.
Fire