The "Sand".The greatest discovery in the history of mankind, as dangerous as it is revolutionary.It has nothing to do with the very common banal sand that can be collected on the ground, its value is of equal importance to that of diamonds and Damascus steel. There's more than one reason why even a handful of these grains are so important.Becoming a Master of the Sand is a title coveted by many young people, but attainable only by a few. It is not a profession within everyone's reach, nor should it be treated lightly: when you study to become a Master, you must do it with reasons dictated by seriousness and conscientiousness, above all because the Sand must not end up in the hands of foolish and reckless people.