How small is “nano” ?

Nanometer objects are too small to be seen with your eye. In fact, if you wanted to see a 10 nm sized marble in your hand, your eye would have to be smaller than a human hair.

Nanometer objects are too small to be seen with your eye. In fact, if you wanted to see a 10 nm sized marble in your hand, your eye would have to be smaller than a human hair.