Once there was a story was told: in an old people's house somewhere in China, a rope was given an elderly person to practice tying knot and untying it.This simple problem solving game requires little cognitive capacity which is to keeps the mind alive and prevents alzheimer's disease in his/her remaining years of life. I see this as a striking metaphor of life journey itself, then became more obvious when one gets old. The past repetitive hurdles we all go through in life have suddenly become a simple gesture of - tying a knot, un-tying it later…

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