blog: The Brain That Grew — Then Shrunk: What I Just Discovered

I published The Brain That Grew — Then Shrunk: What I Just Discovered, a long-form note that starts from a Cleo Abram YouTube Short and then follows the research on human brain evolution, the unexpected Holocene shrinkage, and the idea that culture may have taken over part of the cognitive load. It is the kind of rabbit hole post I like writing here: one short video, a lot of reading, and a sharper takeaway than I expected.