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Egyptian Measuring
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In this activity, learners compare the ancient Egyptian system of measurement, which was based on body lengths, to the customary and metric systems used today.

Make a Human Scale Ladder
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In this quick activity about size and scale (on page 2 of the PDF under What's Nano?

Pea Brain!: Explorations in Estimation
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In this activity, learners use two different techniques to estimate how many little things fit into one bigger thing.