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In this engineering design activity, learners will design, test, and build a “haunting machine” to solve a Sherlockian mystery.

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).

In this two-part activity, learners will extract their own DNA from their cheek cells and learn how DNA is analyzed and used to solve crimes.