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In this activity, learners will explore how computers represent pictures using pixels.

In this activity, learners listen to songs and decode hidden messages based on the same principle as a modem. As a final challenge, learners decode the binary messages in a music video.

In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.

Learners create an Incan counting device called a quipu (pronounced kee-poo).