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In this activity, a group of learners work collaboratively to design and construct a paper model showing the evolution of an environment through multiple stages, from prehistory through the modern cit

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.

This guide outlines how to plant a garden even if you don't have a yard!

In this activity (on pages 19-24 of PDF), learners soak chicken bones or eggshells in vinegar for several days.