> Indeed, humans may be special in that babies are more and more just enough developed to be born, so that they just can be born through normal labour. I think

> Indeed, humans may be special in that babies are more and more just enough developed to be born, so that they just can be born through normal labour. I think a corollary of this is maybe the simplest (while still compelling) argument for the possibility of greater than human intelligence (be it alien, modified human, AI, etc). For it to be true that greater than human intelligence is impossible, all of the following would have to be true: 1) after some point, bigger brains have diminishing returns wrt intelligence 2) the maximum beneficial brain size just happens to fit through a primate pelvis modified for an upright walking gate 3) the maximum beneficial brain size can be competitively powered by a hunter gatherer diet To me, that seems like a very unlikely conjunction!