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Why do you have to know the existence of zero to do mental training? What does mental training have to do with numbers? I am betting that indigenous Amazonian I brought up, spending all of his life hunting, does constant mental training out of necessity.
Why do you have to know the existence of zero to do mental training? What does mental training have to do with numbers? I am betting that indigenous Amazonian I brought up, spending all of his life hunting, does constant mental training out of necessity.