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Learners investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water.

How does a green roof, or roof covered by plants, affect the temperature of the inside and outside of a building? Learners design and build houses to find out the answer.

Learners build a model of a pollution control device--a cyclone. A cyclone works by whirling the polluted air in a circle and accumulating particles on the edges of the container.

In this activity, learners make a 3-D model of DNA using paper and toothpicks. While constructing this model, learners will explore the composition and structure of DNA.

Get a roll of pennies, throw them on the ground, then remove those that only show tails, and repeat with the ones left over.

In this engineering/design/arts and crafts activity, learners design and build "platforms" or "bridges" that can hold weight, and test which glue makes the strongest structure.

Play with a slinky and make transverse waves. In this simple Exploratorium Science Snack, learners will experience making waves and will learn the different parts of a wave.

No glue is needed for learners of any age to become marshmallow architects or engineers.

In this activity, learners create a model using metric measuring tapes and atmosphere composition data.

In this activity, learners simulate the behavior of the atmosphere.

In "Chemistry Makes Scents," participants use their noses to distinguish between chemicals with very similar structures.