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In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

In this design challenge activity, learners add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.

A magic lantern is a light that projects an image onto a screen.

In this activity related to microbes, learners create scale models of microorganisms and compare relative sizes of common bacteria, viruses, fungi and protozoa using metric measures: meters, centimete

In this activity, learners explore how musical instruments are engineered.

In this activity, learners construct a device that allows them to view 2-D images in 3-D.

This activity (on page 2 of the PDF under SciGirls Activity: Music and Sound) is a full inquiry investigation into sound frequency.

In this activity, learners make a Benham Top to explore visual illusions and optics.

In this activity, learners experience firsthand how marine animals' adaptive coloration camouflages them from prey.

In this activity, learners make their own Sun tracker to explore how ancient civilizations around the world studied the Sun.

This activity provides an opportunity for learners to observe and examine how carbon dioxide, water, and light produce glucose/starch through a process called photosynthesis.

In this activity, learners will use Google Sky to observe features of the night sky and share their observations.