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In this activity, learners separate a mixture of pebbles, salt crystals, and wood pieces. They add water and pour the mixture through a strainer.

In this activity, learners explore how distance can affect the way we perceive the size of an object.

These math posters have questions written on them, such as: How many colors can you name in a minute? or How many seconds can you balance on one foot?

In this activity, learners explore in what ways the shape of the land and the pull of gravity influence how water moves over Earth.

This activity provides instructions for making an aircraft that can really fly using a straw and paper hoops!

In this activity, learners create a biosphere in a baggie.

In this craft activity, learners create a string of cut-out moons and stars.

Learners investigate the properties of the liquids in two bottles. One contains layers of oil and water, and one contains oil, water, and soap.

In this activity, learners will experiment with textures, shapes, and materials and create their own unique masterpieces.

In this activity (page 2 of PDF), learners play with a lens and a piece of paper to focus an image on the paper. Learners look at different things, and see how the lenses affect the image.

In this activity, learners make a yeast-air balloon to get a better idea of what yeast can do. Learners discover that the purpose of leaveners like yeast is to produce the gas that makes bread rise.

This hands-on astronomy activity lets learners hunt for different objects in the night sky that contribute to stellar and planetary formation, using a Treasure List.

In this engineering design challenge, learners make a bird and then control its flight with attached strings.

In this activity, learners design and build a toy top out of simple, everyday materials and have the option to use the toy as an artistic tool.

In this fun and interactive online exhibit, the straight lines of a tile wall appear to curve. The learner moves the rows of tiles and changes the color of the grout to achieve the intriguing effect.

In this simple game, learners start to understand how to sort and categorize objects by trying to guess the connection between three items that someone else has chosen.

In this activity, learners build magnetic towers to explore the forces and properties of magnets.

This assortment of mathematical games can be played while traveling.

This is a hands-on activity that uses bread and household materials to grow mold. Learners collect dust from a room, wipe it on food, and contain it. One to seven days later, mold has grown.

Build a car that runs on air. Using household materials, experiment with the power of air to create thrust powerful enough to move a homemade car.