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Mirror Messages
Source Institutions
In this activity, learners use mirrors to write secret messages to a friend. Use this activity to explore letters, optics, and/or symmetry.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-292.png?itok=RXlaKz-t)
Fingerprints
Source Institutions
In this activity, learners examine their fingerprints and learn that they can be categorized by shape, but each fingerprint is unique.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-612.png?itok=EkArGzwt)
Secret Goldenrod Messages
Source Institutions
In this activity, learners write invisible messages on goldenrod paper, and make the message appear and disappear using acids and bases.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-281.png?itok=XYfbgMtv)
Scytale Messages
Source Institutions
In this activity, learners use a soda can to decode a secret message. Learners wrap scytale (pronounced ski-tally) code around a can and challenge friends to see if they can crack the codes.