When you build something, say a desk, there are parts that need to be precise and parts that do not. The legs must all be the same length, but it can be larger or smaller or taller or shorter without causing issue.
So, at least before factories made it really easy to repeat the same process over and over, deskmakers would be very consistent about somethings and less consistent about others.
Your body follows a set of instructions as it builds itself. This set of instructions includes telling it what must be precise and what it can be sloppy with. This way it doesn’t waste valuable resources making your scalp as precisely as it does your eyes.
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