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In this activity, "write" a secret message in genetic code as beads on a string.

In this activity (on pages 34-39), learners make a fairly detailed model of DNA using licorice and gumdrops.

Learners write an invisible message using lemon juice on a piece of paper. They then develop the message by soaking the paper in a dilute iodine solution.

Learners write a message in Braille using beans to form the patterns of dots. Learners glue beans in place, and then challenge another learner to read the message.

In this activity, one person acts as a human robot while another acts as their developer by programming their actions.