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In this activity, learners investigate the basic crystal structures that metal atoms form.

Is a square stronger than a triangle? Use tongue depressors to build simple shapes. Then apply a little weight to them and see what happens!

In this activity, learners create a model of a neuron by using colored clay or play dough. Learners use diagrams to build the model and then label the parts on a piece of paper.

In this activity, learners construct bug models that "jitter" all over the table with just a battery, motor, and counterweight.

In this math activity, learners sort patterns into similar "families" or groups that have the same pattern, but different symbols.

In this activity, learners explore the concept of density by pouring 5 different liquids into a jar. Food coloring is added if needed to give each liquid a distinct color.

Learners make a mobile model of a carbon atom using clay, wire, and pipe cleaners.

In this great hands-on activity, learners use patterns to make a teepee from newspaper that they sit inside.

This activity shows you how to make amazing crystal spikes using Epsom salt and the sun.

In this activity, learners build a bird feeder or feeders to attract birds for observation.

In this activity, learners follow simple directions to explore and create platonic solids.

In this activity, young learners explore the basic shapes of constellations by making their own scope out of a cardboard tube and paper with pinpricks.

In this math activity, learners trace their hands and estimate the number of beans that can fit into their hand tracings. Then, learners glue the beans to the tracing to test out their estimations.

In this activity, learners design and build a NASA rover using raw pasta and candy with a limited imaginary budget.

In this activity related to nanotechnology, learners observe some of the effects that result from creating a thin layer of material several nanometers thick.

Using a milk-based recipe, learners create "moo glue" which is basically white school-type glue. The "secret ingredient" in milk that helps make glue is a chemical called casein.

Learners assemble a hot-air balloon from tissue paper. The heated air (from a heat gun) inside the balloon is less dense than the surrounding air and causes the balloon to float.

In this activity, learners explore the engineering design process and the basic mechanics behind building bridges as they build one themselves using gumdrops and toothpicks.

In this activity, learners design and build their own parachute using household materials with the goal of landing their passenger safely on a target.

In this activity on page 5 of the PDF (Plants—The Green Machines), learners use chromatography to separate and identify pigments within various leaves.