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42,000,000 grains is about 2,000 times as heavy as a Human Brain
In other words, it's 2,020 times the weight of a Human Brain, and the weight of a Human Brain is 0.000495 times that amount.
(adult)
The average weight of an adult human brain is between 20,800 grains. In humans and primates, sight and vision utilize about 30 different parts of the brain which together account for about half of the brain's size.
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