JBP mentions that most everything our brain does is way too important for us to be conscious of. He likes to ask how long we'd last if we had to decide to breath, and how much, and to not forget or get distracted. A relatively small portion of our brain is devoted to what we would consider consciousness and intelligence. There's probably a fairly small difference between high IQ and low IQ people that ends up in considerable difference in occupations and problem solving skills.
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