ruler
![Learner cuts a paper ruler in half](https://nisenet.org/sites/default/files/styles/curated_list_large/public/MeasRuler_cutting_Dec08.jpg?itok=8nbtQ_lJ)
Exploring Size - Tiny Ruler
In this activity, learners investigating just how small a billionth of a meter is by repeatedly cutting a paper ruler in half.
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![Screen shot of a green ruler measuring in centimeters](https://nisenet.org/sites/default/files/styles/curated_list_large/public/images/catalog/8890/little_things.png?itok=YzlnBc7C)
Try measuring little things!
In this activity, learners use a ruler to measure small things and consider the need for special measurement tools at the nanoscale.
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