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635,000,000 grams is about 450,000 times as heavy as a Human Brain.
In other words, the weight of a Human Brain is 0.000002130 times that amount.
(adult)
The average weight of an adult human brain is between 1,300 and 1,400 g. 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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