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In this activity, learners separate a mixture of pebbles, salt crystals, and wood pieces. They add water and pour the mixture through a strainer.

$1 - $5 per group Ages 4 - adult Under 5 minutes
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In this activity, learners explore how distance can affect the way we perceive the size of an object.

free Ages 4 - 18 5 to 10 minutes
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These math posters have questions written on them, such as: How many colors can you name in a minute? or How many seconds can you balance on one foot?

free Ages 4 - 14 30 to 45 minutes
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Learners investigate the properties of the liquids in two bottles. One contains layers of oil and water, and one contains oil, water, and soap.

$1 - $5 per group Ages 4 - 14 10 to 30 minutes
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In this activity, learners will experiment with textures, shapes, and materials and create their own unique masterpieces.

$1 - $5 per group Ages 4 - adult 10 to 30 minutes
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In this activity, learners make a yeast-air balloon to get a better idea of what yeast can do. Learners discover that the purpose of leaveners like yeast is to produce the gas that makes bread rise.

$1 - $5 per group Ages 4 - 18 5 to 10 minutes
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This hands-on astronomy activity lets learners hunt for different objects in the night sky that contribute to stellar and planetary formation, using a Treasure List.

1 cent - $1 per student Ages 4 - adult 45 to 60 minutes
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In this engineering design challenge, learners make a bird and then control its flight with attached strings.

$1 - $5 per group Ages 4 - 18 1 to 2 hours
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In this activity, learners design and build a toy top out of simple, everyday materials and have the option to use the toy as an artistic tool.

$1 - $5 per group Ages 4 - adult 10 to 30 minutes
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In this fun and interactive online exhibit, the straight lines of a tile wall appear to curve. The learner moves the rows of tiles and changes the color of the grout to achieve the intriguing effect.

free Ages 4 - 18 5 to 10 minutes
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In this simple game, learners start to understand how to sort and categorize objects by trying to guess the connection between three items that someone else has chosen.

free Ages 4 - adult 5 to 10 minutes
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This assortment of mathematical games can be played while traveling.

free Ages 4 - 14 10 to 30 minutes
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This is a hands-on activity that uses bread and household materials to grow mold. Learners collect dust from a room, wipe it on food, and contain it. One to seven days later, mold has grown.

1 cent - $1 per student Ages 4 - 18 1 to 7 days
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In this activity, learners use objects they find on a nature and water to make creative frozen sculptures.

free Ages 4 - adult 10 to 30 minutes
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This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing).

$5 - $10 per group Ages 4 - adult 5 to 10 minutes
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This website contains several activities. Mixing in Math Moments are activities that take 5-10 minutes that keep learners occupied, learning about the world, and using math on their own.

free Ages 4 - 14 Under 5 minutes
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In this activity, learners explore the web of connections among living and non-living things.

1 cent - $1 per group Ages 4 - 14 30 to 45 minutes
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In this activity, learners will divide into teams or groups of equal size. “How many teams of three can we make?” “We need an equal number of children at each of the four computers.

free Ages 4 - 14 5 to 10 minutes
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In this activity, learners investigate how some butterfly wings get their color.

Over $20 per group Ages 4 - adult 10 to 30 minutes
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In this activity, learners investigate the properties of graphene and graphite.

Over $20 per group Ages 4 - adult 5 to 10 minutes