Irrigation. But Iron Working and Celestial Navigation are good shouts too.
this post was submitted on 29 Apr 2024
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Spray cheese
Central air
Fire
Surely it has to the FRIDGE?
The time machine.
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.