Cell Size and Scale / by Jason Nunes

Very simple, but effective interactive data visualization from the Genetic Science Learning Center of the University of Utah that shows the relative scale of things like amoebas, skins cells, viruses, etc.

Starting with a scale we can understand--Coffee beans, and grains of rice...
Putting Cell Size in Perspective

you can quickly zoom down to the level of cells, viruses, finally ending at a carbon atom, and get a real sense of how small these things really are.
cell2

Very nifty.