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Is 635,000,000 grams as heavy as a Human Brain?

It's about 450,000 times as heavy as a Human Brain
The weight of a Human Brain is about 1,350 grams.
(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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