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For sixth-grade science, I like to use a text called The Universe in My Hands, which is “a general science course in which the elements of the material universe are ordered by size and the student is introduced to the disciplines of the science as a function of their sizes.” The student encounters the universe by ordering things according to their magnitude. You and I, for example, as humans, are on the order of 1 x 10^0 meters (one times ten to the zero power), which we call the Zero Order of Magnitude, or .
A cat is smaller than that, at the 1 x 10^-1 meters or [-1] Order of Magnitude. A marble is at the [-2] scale. A human cell is at the [-5], and a virus is at the [-7], or 2 orders of magnitude smaller than a human cell.More