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In this activity about vision and optical illusions, learners conduct a simple test to demonstrate how our eyes create "afterimages." Learners stare at a black cardboard bat for at least 30 seconds an

1 cent - $1 per student Ages 8 - 18 Under 5 minutes
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This activity (on pages 21-32 of PDF) has learners act out several classic brain teasers.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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Look at pictures through different color filters and you'll see them in a new way. People have used color filters in beautiful photography or sending secret messages.

1 cent - $1 per student Ages 4 - adult 5 to 10 minutes
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In this activity, learners will estimate how many seeds are in a fruit or vegetable, then count to find out. The result: mix estimation with healthy eating.

1 cent - $1 per group Ages 4 - 14 10 to 30 minutes
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Create your own spinning top, and explore color, shapes and spinning. This activity contains instructions for making your spinning top, and tips on how to design and decorate it.

1 cent - $1 per student Ages 4 - 8 5 to 10 minutes
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In this version of a Sumo wrestling bout, players use mathematical skills to move their opponent's counter beyond the track and "out of the ring." Learners reveal playing cards and the player with the

1 cent - $1 per group Ages 6 - 11 5 to 10 minutes
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This fun and simple hands-on astronomy activity illustrates the value of supernovae in the universe.

1 cent - $1 per group Ages 8 - adult 10 to 30 minutes
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In this math activity, learners experiment with the concept of symmetry.

1 cent - $1 per student Ages 4 - 8 10 to 30 minutes
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In this activity, learners create an optical illusion by spinning two attached cups. A round ball seems to magically appear when the cups spin.

1 cent - $1 per student Ages 6 - 11 Under 5 minutes
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In this math activity, learners earn "money" by completing simple tasks. Learners complete as many "jobs" as possible in a set amount of time.

1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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In this math activity, learners play a game using their number sense to make the highest or lowest number possible. Use this activity to explore place value and/or decimals.

1 cent - $1 per group Ages 8 - 11 10 to 30 minutes
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Learners act as engineers and design mini submarines that move in the water like real submarines.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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En esta tira cómica, Mateo y Cientina emplean su conocimiento de la química y las medidas para esta actividad deliciosa - ¡hacer helado!

1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners will use static elecricity to bend a stream of water without touching it. Learners will explore physics and cause and effect through this activity.

1 cent - $1 per student Ages 4 - 14 10 to 30 minutes
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In this activity, learners discover that some plastics will shrink when you get them hot. Learners bake polystyrene in a regular oven and discover what happens.

1 cent - $1 per student Ages 4 - adult 10 to 30 minutes
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Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

1 cent - $1 per student Ages 8 - 18 5 to 10 minutes
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In this physics activity, learners use square blocks to explore how towers fall. Learners attach a piece of string to the side of a block and then construct a tall tower on top of this base block.

1 cent - $1 per student Ages 8 - 14 5 to 10 minutes
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Make snack time into measuring time and learn to read Nutrition Facts labels. Try this when you’re using “pourable” foods, such as cereal, yoghurt, or juice.

1 cent - $1 per group Ages 6 - 14 5 to 10 minutes
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Learners use a candle to investigate the products of combustion. When a glass rod is held over a lit candle, the candle flame deposits carbon on the rod.

1 cent - $1 per group Ages 11 - adult 5 to 10 minutes
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This science activity demonstrates the dominant eye phenomena. What does your brain do when it sees two images that conflict?

1 cent - $1 per student Ages 4 - adult Under 5 minutes