A baby’s brain is nearly as smooth as its bottom because it has not experienced much learning. By the time humans are 6 years old, their brains have reached 90% of their total size. Since brain mass increases but skull size is static, folds develop in the brain’s surface and entire surface of the brain becomes more enfolded (wrinkled). (Wonder, Jacquelyn, and Priscilla Donovan. Whole Brain Thinking. NY: Ballantine Books, 1984, p 5)

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