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Holly MathNerd's avatar

Mathematics, for one. I make myself balance my checkbook using mental arithmetic. I verify it later, since a mistake would be a problem, but the first pass is in my head, not on the spreadsheet or using a calculator. I want those skills to stay sharp.

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Bob Fells's avatar

Josh, you have to understand that human intelligence travels in an arc. A baby knows nothing but steadily progresses in knowledge as the months, then years go. Just going by my observations, I'd say this arc peaks at the age of 15 or 16. In fact, if you ask somebody of that age they will readily tell you that they know everything. Those who are more circumspect will backtrack from that claim but will add that at least they sure know a lot more than you do. Then something happens. As they continue into their 20s their intelligence level begins to decline. By the time they are in their 40s they are as dumb as we are. Fortunately for the world, the next generation has arrived by then to set us all straight.

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