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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.

1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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This is a lesson plan for an activity in which learners, playing the role of archeologists, use math concepts about number bases to decipher the Dresden Codex, an ancient Mayan document.

1 cent - $1 per group Ages 8 - adult 2 to 4 hours