It's hard to say which "invention" is the greatest. I think, you'd have to start with defining the term "great invention" first, as Friday on my mind kinda pointed out.
Writing... the ability to document thought and detail environments of 'the time...
That's definitely a really good one. :thumbsup:
I'd say you have to start with an invention, that made all the other inventions after it or even the process of inventing possible.
So I'd probably go with
the division of labor as one of the most important if not the
"most important" invention. But also
documentation/writing,
time,
currency/money and
god (or whatever name you may call him/her/it).
As for the
"greatest" invention, I'd probably go with... rump steak. Or porn. Or maybe Lasagne....
