I’d say our ability to produce electricity! We use it in everything we do these days… had a power cut for 3 days and it was very very very boring….. and impossibe to cook!
I think maybe fire! Without fire then I don’t think mankind would have developed the way it has.
Some people might say that fire was discovered rather than invented, but perhaps all the future great inventions are already out there, waiting to be discovered?!
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