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In this activity, learners make a model of a beehive using simple materials.

In this activity, learners model the gravitational fields of planets on a flexible surface.

Build and test a scale model of a rainforest canopy walkway.

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

This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing).

Learners use red cabbage juice and pH indicator paper to test the acidity and basicity of household materials. The activity links this concept of acids and bases to acid rain and other pollutants.

In this group activity, learners will mark important developments of life on Earth on a timeline (each foot in length representing 200 million years).

In this math-based activity, learners model the intensity of light at various distances from a light source, and understand how astronomers measure the amount of sunlight that hits our planet and othe

In this activity, learners create and reveal secret messages written with invisible ink! The invisible ink is actually a baking soda solution, and the magical revealing liquid is fruit juice.

In this experiment, learners design and build a model room in a shoebox and furnish it with tiny furniture.

In this physics activity, learners construct a small-scale version of a classic carnival game.

In this water pollution activity, learners create pond water cultures and investigate the effects of adding chemicals or natural nutrients.

In this hands-on art activity, learners will study and identify features of the external anatomy of a fish.

In this activity, learners find Xi'an, the archaeological area in China where the Terra Cotta Army was discovered, on a map or globe and look more closely at the relationship of the warrior site to ot

Learners explore water adhesion and learn about why water molecules are more strongly attracted to some substances than others.

Water treatment on a large scale enables the supply of clean drinking water to communities.

Working in groups, learners model the continuous destruction and creation of ozone (O3) molecules, which occur in the ozone layer.

This game introduces learners to the scale of the greenhouse gas problem, plus technologies that already exist to dramatically reduce our carbon emissions and prevent climate change.