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This is an activity about turbidity, or the amount of sediment suspended in water.

In this math lesson, learners apply the Monte Carlo method of simulation to determine a reasonable estimate.

In this outdoor activity, learners work in pairs using their senses—especially touch—to learn more about individual trees.

Learners will do an experiment to determine which type of paper is strongest while focusing on variables and collecting data.

This activity has learners observe water and compare it to other liquids.

In this activity about human anatomy (page 16 of PDF), learners construct a model arm and discover how muscles and bones work together to achieve efficient movement.

Learners see convection currents in action in this highly visual demonstration. Sealed bags of colored hot or cold water are immersed in tanks of water.

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

Learners develop an understanding of air pressure in two different activities.

In this activity, learners will experiment to find how long it takes to compost paper. They will create their own compost container and test different variables.

In this story time program, young learners listen to the Dr.

In this activity, learners will design a seed and test how it travels. Learners will use the Engineering Design Process to create a seed which can move from place to place.

This is an activity about the behavior of light. Using simple, everyday objects, learners will discover that light moves in straight lines until acted upon by another object.

In this activity, learners explore how the application of nano-sized particles or coatings can change a bigger material’s properties.

In this outdoor activity, learners release a portion of a lawn from human control—no mowing, no watering, no weeding, no pest control—and then investigate the changes that result over several weeks.

In this chemistry demonstration, learners will discover that phenolphthalein is an acid/base indicator. One learner will read a poem about four witches making a potion.

In this activity (on pages 9-14), learners dissect a real flower -- the kind of work botanists do.

This activity is designed to introduce learners to genes, genotypes and simple inheritance patterns.

In this two-part activity, learners compare and contrast a variety of life cycles to better understand different organisms and how they develop.

This is an activity in which learners explore the effects of gravity, motion and momentum while creating art.