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“Exploring Earth: Investigating Clouds” is a hands-on activity in which visitors create a cloud in a bottle and explore it with laser light.

In this optics activity, learners examine how a transparent material such as glass or water can actually reflect light better than any mirror.

Millions of organisms can live in and around a body of water.

In this activity, learners make a model of a one-way heart valve to investigate how a heart controls the direction of blood flow.

Learners test two jars containing hot water, one covered with plastic and one open, for changes in temperature.

Learners combine different plant solutions -- made from fruits, vegetables, and flowers -- with equal amounts of vinegar (acid), water (neutral), and ammonia (base).

Learners test two jars of ice water, one covered and one open, for changes in temperature. After placing the jars in the sun, learners discover that the covered jar cools down more slowly.

Learners will explore the scientific mystery behind a disappearing group of trees by examining data and attempting to explain the decline.

In this activity related to the human circulatory system (on page 10 of the PDF), learners observe the dispersion of a drop of food coloring in water, draw conclusions about the movement of dissolved

This kinesthetic science demonstration introduces learners to four states of matter: solid, liquid, gas, and plasma.

Learners cover a bottle with a balloon. When they immerse the bottle in warm water, the balloon inflates. When they immerse the bottle in a bowl of ice, the balloon deflates.

In this activity, learners discover if carbon dioxide has an effect on temperature.

In this math lesson, learners learn how to construct stem and leaf plots. Learners first estimate the number of drops of water that will fit on the head of a penny.

In this activity (on page 8), learners model how marble statues and buildings are affected by acid rain.