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Learners examine collisions between two skateboards carrying different masses. They learn about conservation of momentum in collisions.

free Ages 11 - 18 30 to 45 minutes
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In this quick activity about the properties of water (page 1 of PDF under SciGirls Activity: Malformed Frogs), learners will use an eyedropper to slowly place one drop of water at a time onto a penny,

1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners play with surprising sand that doesn’t get wet! Learners explore how water behaves differently when it comes in contact with "magic sand" and regular sand.

$10 - $20 per group Ages 4 - adult 10 to 30 minutes
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In this lesson, learners are challenged to discover the relationship among six numbers.

free Ages 11 - 18 30 to 45 minutes
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Through discussion and hands-on experimentation, learners examine the geological (ancient) carbon cycle.

$1 - $5 per group Ages 11 - 14 45 to 60 minutes
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In this three-part activity, learners explore how waves are formed and why some waves are bigger than others. First, learners observe waves of water in a pan generated by an electric fan.

$10 - $20 per group Ages 8 - 11 45 to 60 minutes
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Using a real-size sketch of a baby elephant's footprint, learners estimate, measure and record the width (diameter) and outside edge length (perimeter or circumference) of the footprint.

1 cent - $1 per group Ages 4 - 11 30 to 45 minutes
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In this activity, learners explore reaction time and challenge themselves to improve their coordination. Do you want to move faster? Catch that ball that you never seem to see in time?

1 cent - $1 per student Ages 4 - 14 5 to 10 minutes
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In this activity, learners will plot the distribution of various oozes using information from sediment maps.

free Ages 14 - 18 45 to 60 minutes
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In this coin math activity, learners sort and stack 100 (one hundred) pennies into piles of 5 pennies each, 10 pennies each, and 20 pennies each.

1 cent - $1 per group Ages 6 - 11 10 to 30 minutes
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In this mathematics activity, learners use a map to determine the coordinates of and distance between two locations--both by road and "as the crow flies".

free Ages 8 - 11 10 to 30 minutes
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In this activity (on page 142 of the PDF), learners will compare breathing rates before and after hyperventilation to explore how reduced carbon dioxide levels in the blood lower the need to breathe.

1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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Learners design their own experiment to determine conditions that either help or hinder the decomposition of carrots by soil microbes.

$10 - $20 per group Ages 11 - 14 1 to 4 weeks
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Learners investigate how drag affects the falling rate of objects.

1 cent - $1 per group Ages 11 - 14 45 to 60 minutes
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In this activity, learners use things from the kitchen as building materials to explore how shapes contribute to the strength of different structures.

$1 - $5 per group Ages 6 - 14 30 to 45 minutes
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This is an activity about discovering the colors and beauty of nature. Learners will spend time outdoors, matching paint chip samples, colored paper, or colors of clothing to those found in nature.

$1 - $5 per group Ages 4 - 14 30 to 45 minutes
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In this activity, learners use rice grains to model the composition of the atmosphere of the Earth today and in 1880. Learners assemble the model while measuring percentages.

$1 - $5 per group Ages 11 - 18 1 to 2 hours
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In this activity, learners burn a peanut, which produces a flame that can be used to boil away water and count the calories contained in the peanut.

$5 - $10 per group Ages 11 - 18 10 to 30 minutes
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Learners work as a group to create a map of their community. They use pasta to represent people, and glue the pasta on their maps to show areas of large population.

$1 - $5 per group Ages 6 - 8 30 to 45 minutes
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In this activity about light and perception, learners create and observe moire patterns.

$1 - $5 per student Ages 8 - 14 10 to 30 minutes