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Is 0.00000000500 megatonnes as heavy as a Human Brain?

It's about three-and-a-half times as heavy as a Human Brain
The weight of a Human Brain is about 0.000000001350 megatonnes.
(adult)
The average weight of an adult human brain is between 0.000000001350 megatonnes. 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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