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Use echolocation to find others and experience how whales’ senses have adapted to suit their environment. In pairs, learners are blindfolded and use containers filled with marbles to find each other.

$1 - $5 per group Ages 6 - 11 10 to 30 minutes
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In this computer science activity about finite-state automaton (on page 45 of the PDF), learners use a map and choose various pathways to find Treasure Island.

1 cent - $1 per student Ages 8 - 14 45 to 60 minutes
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In this activity, learners are challenged to design, build and test a birdhouse that will stay cool in the sun.

Over $20 per group Ages 8 - 18 30 to 45 minutes
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In this activity, learners repeat patterns in two and three dimensions to create tessellations.

$1 - $5 per group Ages 8 - 11 1 to 2 hours
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In this activity, learners test the pH of safe liquids available at home by creating a pH indicator from mashed blueberries.

$10 - $20 per group Ages 6 - 18 10 to 30 minutes
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In this activity, learners follow clues to find five puzzle pieces, then assemble them. This activity works well with a whole group, individuals, or families.

1 cent - $1 per group Ages 6 - 14 10 to 30 minutes
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In this activity, learners build their your own seismograph with household materials to document shaking.

$1 - $5 per student Ages 8 - 18 30 to 45 minutes
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In this activity, learners will learn how to knit using only their hands. Learners will explore patterns and fabrication as well as develop fine motor skills and patience through this activity.

$1 - $5 per student Ages 4 - 14 30 to 45 minutes
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Testing magnets is always a fun pastime, but here, we're going beyond "will it attract the magnet?" In this activity, learners will investigate which materials allow magnetic fields to pass through or

1 cent - $1 per student Ages 6 - 18 5 to 10 minutes
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In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

$1 - $5 per student Ages 4 - 14 10 to 30 minutes
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In this activity about archaeology, learners will explore different Egyptian hieroglyphs and recognize their meanings and uses.

free Ages 4 - 11 30 to 45 minutes
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In this math activity, learners explore probability as they play a game. Learners will categorize everyday events as either impossible, possible or certain.

1 cent - $1 per group Ages 8 - 11 10 to 30 minutes
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In this math puzzle, one player hides a rainbow of four colors while another player tries to guess the hidden rainbow colors in the correct order.

$1 - $5 per group Ages 6 - 11 5 to 10 minutes
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In this activity about olfaction (8th activity on the page), learners smell 10 different items with different odors. Then they try to identify the smells when they are mixed together.

$1 - $5 per group Ages 8 - 18 5 to 10 minutes
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In this math lesson, learners play two different games to help them understand coordinates. First, learners read the book, "The Fly on the Ceiling," by Julie Glass.

1 cent - $1 per group Ages 8 - 11 30 to 45 minutes
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In this activity (1st activity on the page), learners explore their sense of taste and the structure of the tongue by taste-testing various foods.

$1 - $5 per group Ages 8 - 18 10 to 30 minutes
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In this activity (11th activity on the page), learners use their sense of touch to identify matching pairs of objects hidden in bags. Learners can also play this game with partners.

1 cent - $1 per group Ages 4 - 14 10 to 30 minutes
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Learners build particulate matter collectors--devices that collect samples of visible particulates present in polluted air.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners make bridges using an oil-based modeling clay (plasticene). The instructions include discussion questions for both before and after bridge building.

$1 - $5 per group Ages 4 - 11 30 to 45 minutes
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Learners classify a variety of objects by their characteristics. They then design an experiment to determine which objects float or sink in water and add this characteristic to their classification.

$5 - $10 per group Ages 8 - 11 45 to 60 minutes