The Evolution of the Human Brain

The cortex, the outer muscle of the brain is associated with sort of these high level mental capabilities that it involves in humans. And as you talk about the cells that give rise to this, I will tell you what we found in terms of the effect of Zika virus. That's the neocortex. It's a mammalian specific thing. The farther away the comparison, it gets complicated. So more things have happened, some of which might be consequential, others of which might not be. We can get a lot closer by looking at the DNA or the genomes of Neanderthals and so on.