Sure, language is less of an invention than money, but "use of fire" was likely not a one-off invention either. I'm sure many people over many generations took part in developing how to use fire.
Yeah, use of fire is certainly debatable. Maybe even the weel.
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That's the other one I was thinking of.
You could maybe say that language and money could not have been developed by one person alone. It must be accepted by a whole community or society. That's not the case with fire or the weel or anything other on the list
