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Learners create an Incan counting device called a quipu (pronounced kee-poo).

In this math-based activity, learners will experiment to find how height and angle affect spatter and then use this knowledge to solve a crime.

This display shows slow chemical reactions in colorful crystal formations known as Liesegang Rings. These reactions are similar to those forming the rings in agates.

In this classic memory game (on pages 37-45 of PDF), learners turn over tiles to reveal images on the back.

Learners build models to learn about the special cells and structures that plants use to move water from their roots up through the stems and leaves.

As a group, learners investigate three packages which are all the same size and shape, but have different contents. One is filled with foam, one is filled with wood, and one is filled with metal.

Learners combine hydrogen peroxide with three different forms of potato: raw chunks, ground chunks, and boiled chunks.

Learners design their own experiment to investigate how pollution diffuses through ground material.

Learners investigate one factor affecting reaction rates: temperature. In a darkened room, two identical lightsticks are placed in water -- one in hot water and one in cold water.

In this activity, learners explore a scale by comparing objects, which look similar but have different weights. Learners predict and then measure the weights of various objects using a scale.