From coffee bean to a carbon atom, how do you compare their sizes. Yes you can say use milli,micro,nano,pico meters. But a visual difference gives more perspective to it. An interactive and surprisingly simple approach is shown in the following page:

http://learn.genetics.utah.edu/content/begin/cells/scale/

On the page, slowly keep moving slider to the right/left.

The scientists split the atom; now the atom is splitting us.
Quentin Reynolds

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