From our world to the "nano world", it is necessary to make three successive cuts by a factor of 103:
- from the human size to a grain of sand → from the meter to the millimeter,
- from the grain of sand to the bacteria → from the millimeter to the micrometer,
- from the bacteria to the molecule → from the micrometer to the nanometer.
From the planetary dimension to the molecular dimension. Extract of "NANO the next dimension" (2002).