How can one really describe something so small? It would take 1 billion of them just to make a meter, something one could walk in a second. Since Menomonie to Des Moines is about 1000 km and that is also 1 billion millimeters then walking 10 mm of that trip would be the same as 10 nm.
On the other spectrum we have a mole which can be a huge number. A mole come from the number of particles in 12 grams of carbon-12. This number is about 6.02 * 10^(23). So if you were to have a mole of people that would be 6.02 * 10^(23). This number is so big its hard to truly comprehend its size. If 1 mole of pennies was given out to all the people in the world then each person would have enough money to spend 1 million dollars an hour for the rest of their life. The US dept right now is almost 15 * 10^(12) this number is not even close to a mole.
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