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  tells us that 98% of the atoms in the human body are replaced in less than one 
  year and that within the span of four years every single atom of the human body 
  is replaced at least once. Yet no one is conscious of these facts in their everyday 
  life. In the same way no one is aware of the extremely high rate of speed at 
  which thought arises. In the Buddhist teaching, there are said to be thousands 
  of changes per second, a constant flux of change. While it is not possible to 
  chan