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

In this activity, learners will explore how maps can provide information about a place and help us find our way from one location to another.

In this Cyberchase activity, learners make decoders to send and receive secret messages. Learners make the device out of two 8-ounce cups and two code strips.

This activity shows learners how computers use numbers to represent pictures. A grid is used to represent the pixels (short for picture elements) of a computer screen.