As a species, humans are incredibly smart. We tell stories, create magnificent art and astounding technology, build cities, and explore space. But our intelligence comes with a curious caveat: our babies are among the dumbest that exist. A baby giraffe can stand within an hour of birth. A human infant can’t even hold up its own head. Humans are born quite helpless, but, fairly early on, we start becoming quite smart, again far more so than any other primate. What if this weren’t a contradiction so much as a causal pathway?