As others have mentioned, intelligence consumes a lot of energy, so what really allows us to be smart is what we eat, and what do humans eat differently? COOKED FOOD, you get way more resources out of food if we cook it, so we could actually fuel our brains without hurting other body parts.
We also have a lot of skills that allow us to show that intelligence to their maximum potential, having thumbs and being bipedal allow us to wield tools and carry more stuff, being social allows us to specialize in things other than “FIND FOOD!” and also:
BABIES ARE REALLY DUMB, we learn a lot but for our brains to get that advanced it takes a lot of time, other animals are born and are ready to walk in minutes babies require constant protection for years, they know nothing but they can learn way more, they have way more brain plasticity, so if you’ve ever wondered why babies are so useless that’s why
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