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the best inventions for humans have to do with food, shelter, health, and energy production---most of these "inventions" happened within the last 100 years, which is a nanosecond on the timeline of human development.
there are many examples, such as:
salk vaccine
organized and efficient farming
managed forestry as a renewable resource
organized commercial fishing and preservation
oil and gas exploration
nuclear fusion
solar heating
harnessing wave and wind power
etc
etc
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