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This fun and simple hands-on astronomy activity illustrates the value of supernovae in the universe.

In this activity, learners are asked to examine the differences between two materials in a pair.

In this simulation, learners act out each digestive function of the organs, tissues, and cells in the digestive tract.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

In this activity, learners explore nonrenewable resources and learn why these resources are finite.

Learners observe a flask with a balloon attached over the mouth and inverted inside the flask.

In this activity, learners explore how engineering has developed various means to remove impurities from water.

Learners observe and compare the sizes of three toy “growing” crocodiles made from water-absorbent polymers. One is it its original state, dry, hard, and about 10cm long.

In this activity, learners are challenged to design and construct a trophy for prize-winning sports equipment.

The Let's Do Chemistry "Build a Battery" activity lets participants learn how batteries work and how materials behave, change, and interact by building their own simple battery out of metal and felt w

In this activity, learners use heat to separate zinc and copper in a penny. This experiment demonstrates physical properties and how physical change (phase change) can be used to separate matter.

In this activity, learners explore the structural strength of triangles by creating their own free-standing geodesic dome out of plastic straws.

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

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

In this physics activity, learners build a toy with a figure that spins around like a gymnast on the high bar.

In this activity about human interface design issues, learners help the Oompa-Loompas of a great chocolate factory solve different problems.

In this activity (26th on the page), learners construct an easy-to-build device and test motor learning.

Learners build and investigate pendulums of different lengths. They discover that the longer the string of the pendulum, the longer the time it takes to swing.

In this activity, learners investigate procedural memory.

Learners engage in close observation of falling objects. They determine it is the amount of air resistance, not the weight of an object, which determines how quickly an object falls.