Human infants are born with craniums made up of four plates that have not yet knit together into a solid dome so that their heads can compress to fit through the birth canal, so that the brain within can then expand. The seams of these plates are intricate, like fingers interlaced, like the meander of arctic rivers across tundra. The skull quadruples in size in the first few years, and if the bones knit together too soon, they restrict the growth of the brain; and if they don’t knit at all the brain remains unprotected. Open enough to grow and closed enough to hold together is what a life must
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