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In this online brain stumper, the bottom half of a series of letters is covered. You may think you know what it says, but remove the black bar to see if you're right.

1 cent - $1 per student Ages 8 - 14 5 to 10 minutes
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In this activity, learners will conduct an open-ended survey, and then organize and analyze results. What languages does everyone speak? What’s the most common? the least common?

1 cent - $1 per group Ages 6 - 14 5 to 10 minutes
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In this introductory demonstration and activity, learners are introduced to the concept of density as they explore a rock and a wooden block in water.

$1 - $5 per group Ages 8 - 14 30 to 45 minutes
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In this activity, learners explore the economics of coal mining as you they use fake money to purchase mining tools, attempt to carefully mine their cookies, sell their chocolate chip ore, and try to

$5 - $10 per student Ages 6 - adult 10 to 30 minutes
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In this quick activity, learners observe how the added sugar in a can of soda affects its density and thus, its ability to float in water.

$1 - $5 per group Ages 6 - 14 Under 5 minutes
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This activity introduces the idea that computer scientists measure information by how "surprising" a message is.

free Ages 8 - 14 30 to 45 minutes
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In this activity, learners work in groups to determine the mass and volume of four samples: glass marbles, steel washers or nuts, pieces of pine wood, and pieces of PVC pipe.

$10 - $20 per group Ages 11 - 18 45 to 60 minutes
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In this activity, learners work in teams to study the observation skills essential to scientific research.

1 cent - $1 per group Ages 11 - 18 45 to 60 minutes
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In this activity, learners create three-dimensional shapes by making some origami models of simple boxes and containers.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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In this demonstration, learners observe as a bottle is placed on a table with wooden hoop balanced on top and a pencil balanced on top of the hoop.

$1 - $5 per group Ages 8 - 18 Under 5 minutes
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In this simple activity, learners investigate refraction by placing a picture of an arrow behind a glass of water.

free Ages 8 - 14 5 to 10 minutes
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This is an activity (located on page 4 of the PDF under Surface Area Activity) about surface area and reactivity.

$10 - $20 per group Ages 8 - 14 1 to 2 hours
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In this activity, learners make models representing bones on Earth and bones that have been in space. They discover what happens to bones without proper exercise and nutrition.

$1 - $5 per student Ages 8 - 14 5 to 10 minutes
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In this activity (on page 2), pairs of learners create an imaginary crime scene. One person leaves the room while the other person moves a few things around.

free Ages 6 - adult 5 to 10 minutes
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In this chemistry activity, learners use guar gum to make slime. Use this activity to introduce learners to polymers, viscosity, and colloids.

$5 - $10 per group Ages 11 - 18 5 to 10 minutes
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This is an activity which will allow learners to gain an understanding of lemur behavior through observation and role play.

free Ages 6 - 14 10 to 30 minutes
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In this activity, learners experiment with different variables in making hollandaise sauce to achieve the correct texture and consistency.

$10 - $20 per student Ages 11 - 14 45 to 60 minutes
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In this activity, learners explore how the power of the sun can be harnessed to heat and cool a building.

$10 - $20 per group Ages 8 - 18 1 to 2 hours
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In this activity, learners explore sublimation by conducting experiments with dry ice.

$10 - $20 per group Ages 11 - 14 45 to 60 minutes
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In this chemistry activity (page 1 of PDF SciGirls Activity: Milk Carton Boat), learners will create a blob of stretchable funny putty out of a water, borax, and glue mixture.

$1 - $5 per student Ages 8 - 14 30 to 45 minutes