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It's debatable if you could call these inventions, rather than developments but I humby submit the following.
In order,
Language
Writing
Without both of these, we would have no civilization, as we know it, and therefore none of the other more obvious "inventions".
Agriculture comes a close third.
I highly recommend the book The Third Chimpanzee for some very interesting discussions on this fascinating subject.
Mr Mephisto
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