In our last post, we looked at some of the many ways life could be prevented from giving rise to a pre-intelligent species–say, an animal like Proconsul, the earliest known ape, living about 25 million years ago. In doing so, we knocked f_i down to 0.02. Here, we’ll look at what could prevent the descendants of a pre-intelligent species from evolving intelligence.
First, we have to set aside our self-centered bias and admit a blunt truth: Evolution has no goal. It blindly pursues local optima. There’s no guiding hand ensuring that evolution reaches an unsurpassable pinnacle, i.e., us.