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In this activity, learners simulate taking HIV antiretroviral drugs by using Tic Tac mints and Kool-Aid packets.

This activity investigates how bark beetles can threaten forests by having learners estimate the number of infected trees from a photo.

This is a virtual representation of a sound mixer containing pre-looped sounds of animal, insect, and environmental noises.

This is a virtual representation of a sound mixer containing pre-looped sounds of animal, insect, and environmental noises.

In this online activity, learners make a whole rainbow by mixing red, green, and blue light. They can change the wavelength of a monochromatic beam or they can filter white light.

In this activity on page 9 of the PDF, learners test how flavoring extracts move through the walls of a balloon.

In this activity about sea otters, learners make their own "otter whiskers" and use them to find objects underwater.

This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to simulate what it'

In this demonstration (9th on the page), learners explore eyewitness memory and how memories differ amongst individuals. While the rest of the group is minding their own business (i.e.

In this outdoor fall activity, learners find out what living in or under a layer of leaves is like.

This is an online simulation of how sound changes due to environment. How does place--like a cave, a pier, or a forest--affect certain sounds?

This game plays a dozen different sounds, altered to simulate what they would sound like if you had hearing loss.