There is no objective evidence that we are getting any more intelligent than past intellectuals even if we are simply just building on top of previous achievements. Just alone the notion that you would not realize that our "achievement" is just building upon achievements of the past is proof enough that there really has been little to no improvement. Call me when humanity has been able to wrestle itself away from the mental parasite that is religion. Then we can talk about the possibility of super intelligent humans. Let's the get the blatantly obvious mental health issues out of the way first.