I have a hard time calling language an invention. Many other species communicate. Although our forms of communication are much more advanced than theirs, it's still a basic thing that people didn't invent, we just perfected it.
My vote goes for the harnessing electricity. No other invention had changed human life so rapidly.
Fire was great, but 150 years later we were still weak creatures that got our asses kicked on a regular basis. Same pretty much goes for the wheel.
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