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Learners shine the light of a laser pointer through sheets of fabric that all have a different number of threads per inch.

In this activity (on pages 16-21), learners get a sense of geological time by understanding how big a million is.

These math posters have questions written on them, such as: How fast can a cheetah run? or How long can a giant tortoise live? Post these around the room or leave them out for children to explore.

Learners build a pendulum from a yo-yo, and then design their own experiment to determine what affects the pendulum's period of swing.

This magic trick is based on how computers detect and correct data errors.

In this activity on page 13 of the PDF, learners use a laser pointer (with known wavelength of light) to measure the thickness of a human hair.

In this quick activity (page 1 of the PDF under SciGirls Activity: Tug O' War), learners will test how many pennies a flat paper index card bridging the gap between two stacks of books is able to supp

In this activity, learners model ancient lunar impacts using water balloons.