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681 fluid drams (ʒ) is about twice as heavy as a Human Brain
In other words, it's 1.96 times the weight of a Human Brain, and the weight of a Human Brain is 0.51 times that amount.
(adult)
The average weight of an adult human brain is between 347 fluid drams (ʒ). 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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