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In this chemistry activity, learners use thin layer chromatography to determine the molecular composition of different markers.

In this fun math activity (page 5 of the pdf), learners will help a secret agent crack a case by solving math problems.

In this activity, learners write invisible messages on goldenrod paper, and make the message appear and disappear using acids and bases.

In this activity (page 1 of the PDF under SciGirls Activity: Forensics), learners will use a home video camera with a “night vision” mode to test how various inks appear outside the spectrum of visibl

In this activity, learners combine two substances (plaster of Paris and water) to make a cast of an object's imprint in clay.