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Science
How much brain cells does a twelve year old have?
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the average 12 year old has about 100 billion cells
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A newborn baby has all of the brain cells they'll have for the rest of their life, but it's the connections between these cells that really make the brain work. A child is born with 100 billion brain cells. A 12-year-old's brain may have stopped growing in size but it's nowhere near done developing.
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