start with a tennis ball - 1 times ten to the eight nanometers
about ten times smaller is a marble - 1 times ten to the seventh nanometers
about ten times smaller is the head of a pin - 1 times ten to the sixth nanometers
about ten times smaller it the width of a human hair- 1 times ten to the fifth nanometers
about ten times smaller is a cell- 1 times ten to the fourth nanometers
about ten times smaller is bacterium- 1 times ten to the third nanometers
about ten times smaller is a virus- 1 times ten to the two nanometers
about ten times smaller is a nano device - 1 times ten to the one nanometers