When you look at a lizard brain with your naked eye, it looks as if the brain has a very, very small cerebral cortex or no cortex at all. But when you peer into the brain, into the cells, what you can see is that there are no new neurons. It's just that through evolutionary time, as brains have gotten larger and larger, they reorganize themselves. And humans have the same complement of neurons as a blood-sucking lamprey.

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