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Originally posted by THENEO
We have done this thread before here.
But it is a good discussion.
I think that writing was the greatest invention.
Speech is very important but consider the difference in development between those cultures that had sophisticated language with no writing and those that had language and writing.
Next I would choose printing. This allowed knowledge to be easily and cheaply distributed to many.
It gets much more difficult after this point to choose the most important inventions in any kind of order. Easily the most important invention I have seen recently was the PC.
Most important future invention I think will be a gravity generator.