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Learners investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water.

1 cent - $1 per group Ages 8 - 14 30 to 45 minutes
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This is a simple activity fully driven by imagination. Using materials from the home, toys, or items from nature, learners create their own world to play with.

free Ages 4 - 8 30 to 45 minutes
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This is an activity that models the operation of a seismograph, a tool used to measure the size of earthquakes.

1 cent - $1 per student Ages 11 - 18 30 to 45 minutes
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Discover the wind's direction using bubbles, a map and a keen eye. Learners blow bubbles and note their general direction on a map, taking readings from different points around a building.

1 cent - $1 per student Ages 6 - 11 30 to 45 minutes
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In this activity, learners conduct a simulation exercise related to public key encryption and try to intercept a message sent between two learners.

free Ages 11 - 18 30 to 45 minutes
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In this activity, learners use a pneumatic trough (see related activity) to generate and collect pure oxygen.

Over $20 per student Ages 14 - adult 30 to 45 minutes
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This activity explores the main algorithms that are used as the basis for searching on computers, using different variations on the game of battleships.

1 cent - $1 per group Ages 8 - adult 30 to 45 minutes
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In this activity, learners investigate how different materials repel or absorb water. Learners use spray bottles to explore how everyday items like sponges, cardboard, feathers, etc.

$1 - $5 per group Ages 4 - 8 30 to 45 minutes
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Some aquatic organisms live in open water, while some live in soil at the bottom of a body of water.

$1 - $5 per group Ages 6 - adult 30 to 45 minutes
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In this design challenge, learners will practice empathy and design thinking skills by creating a play space that is fun, both for themselves and other kids.

free Ages 8 - 18 30 to 45 minutes
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In this activity, learners investigate and compare the rate of drying in different conditions.

$1 - $5 per group Ages 6 - 11 30 to 45 minutes
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In this experiment, learners separate different types of molecules in marker inks (using a technique called "thin layer chromatography").

$1 - $5 per student Ages 4 - 8 30 to 45 minutes
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In this math activity (Page 12 of the Play Ball! PDF), learners play a game of "soccer" and analyze the results of the game.

1 cent - $1 per group Ages 8 - 14 30 to 45 minutes
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In this activity, learners construct a simple game to test their hand-eye coordination and steadiness of hand.

1 cent - $1 per student Ages 6 - 14 30 to 45 minutes
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In this activity, learners build a "pneumatic trough," a laboratory apparatus used for collecting pure gas samples over water.

$10 - $20 per student Ages 14 - adult 30 to 45 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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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 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
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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.

$1 - $5 per group Ages 4 - 11 30 to 45 minutes
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In this design challenge activity, learners use a balloon and other simple materials to design an air-powered rocket that can hit a distant target.

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