But the things we realize we don't know are much harder to figure out, they take more resources (time, money, study participants, analysis, etc). That's the rea

But the things we realize we don't know are much harder to figure out, they take more resources (time, money, study participants, analysis, etc). That's the reason things are, and should be, slowing down. We are, clearly, close to figuring out most of the easy stuff. For our current definition of "easy" based on the amount of work, computing power and strength of the mathematical tools that we consider normal.