For some people, it happens naturally. People like Shakunthala Devi and Sri Ramunujam falls under this category. No one knows how they achieved it. It is said to be a blessing. They themselves cannot explain it.
And there are other great people like Squadron leader Jayasimha (leading trainer on memory, holding multiple Guinness records) and Mahasahasravadhani Garikapati Narasimha Rao. They always say that it is possible to train anyone to their standards provided the learner has the required attitude to learn. So, it is all about learning the techniques and following the process.
Another set of people, Yogis who meditate and the existence reveals its secrets to them. This needs right guidance and consistent practice. Brain and Mind are entirely two different things. While brain is the tangible and physical component of our body, mind is not. We reside in our mind.
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