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Quipus
Source Institutions
Learners create an Incan counting device called a quipu (pronounced kee-poo).
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Slide Rules
Source Institutions
Learners make their own simple slide rules out of paper and learn how they work.
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Secret Writing Devices
Source Institutions
In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.