The way we use our brain. I thought that everybody’s brain was used similarly to hire I use mine. But I’m fact everybody did it differently.
For instance, some people use more of their visual cortex to do maths, and assign colors to different numbers. For some maths takes place more in the language part, or timekeeping part.
Richard Feynman did some experimenting with this: https://youtu.be/lr8sVailoLw ( from 2.08)
But it makes sense, in school nobody tells you how to use your brain, they just give assignments and look at the outcome, also you don’t really control how your brain works, you can train it to do some things more efficient, but you can’t learn to do maths in your visual cortex.
Hold up? What county is this?