Take some simple measurements, add a dash of algebra, and you basically have a way to measure an unknown mass.
from Science Latest https://www.wired.com/story/you-can-make-your-own-scale-with-a-rubber-band-and-a-ruler
from Science Latest https://www.wired.com/story/you-can-make-your-own-scale-with-a-rubber-band-and-a-ruler
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