However, brain growth faced a literal bottleneck: the birth canal. There were physical limits to how large a head hominid females could give birth to and still have a pelvis that would allow them to walk upright. #JonathanHaidt

However, brain growth faced a literal bottleneck: the birth canal. There were physical limits to how large a head hominid females could give birth to and still have a pelvis that would allow them to walk upright. #JonathanHaidt

— English Quotes (@english_quotes) Oct 20, 2023