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In this activity, learners use what they know about probability to figure out what is in a mystery bag. Learners analyze data to guess how many of each color crayons are in the bag.

free Ages 8 - 11 10 to 30 minutes
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In this activity (on page 2), one person "programs" the other like a robot to move through a space, trying to get them to avoid obstacles and reach a goal.

1 cent - $1 per group Ages 6 - 14 10 to 30 minutes
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In this math activity, learners pretend there is a special store that lets you pay for toys by their weight in pennies.

1 cent - $1 per student Ages 4 - 8 5 to 10 minutes
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In this activity, learners receive a labeled plastic film canister containing a material representing a pollutant (i.e. pencil shavings = a beaver's wood chips).

$10 - $20 per group Ages 8 - 18 45 to 60 minutes
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In this design challenge activity, learners build a boat that can hold 25 pennies (or 15 one inch metal washers) for at least ten seconds before sinking.

$1 - $5 per student Ages 8 - 14 30 to 45 minutes
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In this design challenge activity, learners design and build a solar hot water heater. Their goal is to create a heater that yields the highest temperature change.

$10 - $20 per student Ages 11 - 18 1 to 2 hours
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In this activity, learners will repurpose an old t-shirt to create their own yarn or string.

$1 - $5 per student Ages 4 - 14 30 to 45 minutes
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In this design challenge activity, learners build a tower that can support a tennis ball at least 18 inches off the ground while withstanding the wind from a fan.

1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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In this activity, learners explore how composites work by creating and testing their own composite for an imaginary company.

$1 - $5 per student Ages 11 - 18 4 to 24 hours
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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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In this activity, learners conduct a waste audit and use their findings to implement a plan for reducing trash.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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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 activity, learners discover that training a robot can be hard work! Learners investigate how robots complete a task by following a list of sequential instructions.

free Ages 6 - 14 30 to 45 minutes
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In this activity, learners explore what makes a boat float and sink. They examine and test various objects to determine why objects float or sink.

$5 - $10 per group Ages 4 - 8 45 to 60 minutes
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Learners make a counting/estimating jar to exchange with friends or bring home.

1 cent - $1 per student Ages 4 - 14 10 to 30 minutes
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Make a cuíca (“kwee-ka”), a traditional Brazilian musical instrument that originated in Africa. Played primarily in Brazil, now you can play it at home, too, with this Exploratorium produced activity.

1 cent - $1 per student Ages 6 - adult 10 to 30 minutes
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This is an online game about the complexities of farming. Learners will "draw" cards and make decisions about how to take care of their farm.

free Ages 8 - 18 5 to 10 minutes
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Listen to the beat of gravity. By taking two strings with weights tied to them at different, yet uniform intervals, you can hear the uniformity (and rhythm) of gravity's accelerating pull.

1 cent - $1 per student Ages 6 - 14 Under 5 minutes
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In this activity, learners use a compass, powerful magnet, and copper magnet wire to build a special generator known as a dynamo.

$5 - $10 per group Ages 11 - 14 45 to 60 minutes