Almost 3,000 years ago our ancestors had brain larger than us.
Our brain helped us in surviving numerous tragedies & has been smartest among other species.
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The human brain comprises 86 million neurons whereas, an ant's brain is merely 250,000 neurons.
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As we humans become more social, the neural ganglia gets bigger, but at a point there are so many of them that they specialise & rely on each other.
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A study by author Jeremy DaSilva, anthropologist at Dartmouth College in US, says, with time humans have shifted in more settled communities, by which increase in agriculture and disease can be seen.
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More humans in a bounded area can lead to spread of infectious disease.
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The more the body is closer to the pathogen, the body will put more energy on the immune system that will leave less energy on the growth of brain.