The Invention
TL;DR
The greatest invention (past, present, and future) is the Internet.
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humans are separated from animals by knowledge
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knowledge is primarily acquired via communication
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communication is made (trivially) realtime, async, omnipresent, “embarrassingly parallel” by the internet
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any “comments box” is a node into the resultant immortal “brain cloud” of current & future generations
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at best, future innovations can only optimise the internet, so cannot be considered greater inventions