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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.

In this food science activity, learners explore digestion and proteins by observing the action of meat tenderizer on luncheon meat.

In this activity (on page 1 of the PDF), learners make a "mini-globe" to investigate the causes of day and night on our planet.

In this design challenge, learners use their creativity and imagination to design and test a wildlife crossing for their favorite animal.

In this outdoor activity and bingo-like game, learners explore why and how seeds spread far from the plants that produce them.

Some aquatic organisms live in open water, while some live in soil at the bottom of a body of water.

In this activity, learners explore what happens when polarized white light passes through a sugar solution.

In this activity, learners listen to a story and tell a story of their own as they learn about the importance of elders in Native American cultures.

In this activity, learners will explore reptile biology by taking temperature readings in various places and comparing them.

In this engineering activity (page 3 of PDF), young learners investigate how a pole can be made stable by “planting” its base in the ground or adding supports to the base.

In this outdoor activity, learners use only their senses to to find the extremes of several environmental variables or physical factors: wind, temperature, light, slope and moisture.

In this activity, learners work together to create a life-sized drawing of the human nervous system.

In this game, learners each represent a different organism in an environment. They build a web during the activity, and discover how all the players in an ecosystem depend on each other.

In this version of tag, a large group of learners model how the body fights infection. Learners act as germs, as lymphocytes, and as the body's cells threatened by germs.

In this activity, learners make homemade journals featuring seashell rubbings. First, learners transfer the texture of a seashell onto a piece of paper using a crayon.

In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

How can you make one shade of gray look like two? By putting it against two different color backgrounds! This activity allows learners to perform this sleight of hand very easily.

This resource contains several mini-explorations using a slide projector as a light source to investigate light and the properties of images.

This lesson gives full instructions for making cabbage juice indicator, a procedure sheet for learners to record observations as they use the indicator to test materials, and extension activities to d

In this yummy activity about soil (page 9 of PDF), learners will create layers of soil using food. They will learn about the composition and role of each layer.