What is the Best Idea Ever?
Daniel Dennett and others have called Darwin’s theory of evolution the best idea anyone has ever had. That means that all the ideas that Socrates, Da Vinci, Newton and Einstein ever had, plus all the ideas that everyone else has ever had are also rans. It would be impossible to really justify such a claim objectively, but I will give my guess as to why it might be considered so, at least by luminaries in Western society.
My suggestion is that evolution is the first theory — in the scientific tradition — based on the principle of emergence. That is, it looks at a system from the bottom up, starting with behavior at the micro level and yielding behavior at the macro level.
Regardless of the above, what gets your vote for the best idea ever?