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In this physics demonstration, learners will be surprised when a handkerchief holds water in an upside-down glass.

free Ages 4 - adult Under 5 minutes
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In this activity, learners investigate how inkjet printers produce tiny, precise drops of ink.

$10 - $20 per group Ages 4 - adult 10 to 30 minutes
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In this activity, learners create a colorful bookmark using a super thin layer of nail polish on water. Learners discover that a thin film creates iridescent, rainbow colors.

$10 - $20 per group Ages 4 - adult 5 to 10 minutes
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In this activity, learners make pykrete by freezing a mixture of water and a material like cotton wool, grass, hair, shredded paper, wood chips, or sawdust.

1 cent - $1 per student Ages 4 - adult 4 to 24 hours
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In this activity, learners will test the strength of different brands of paper towels.

$1 - $5 per student Ages 4 - adult 30 to 45 minutes
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In this tabletop activity (on pages 32-40), learners make Möbius strips -- 3D surfaces with only one side.

1 cent - $1 per student Ages 4 - adult 10 to 30 minutes
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In this activity, learners observe live fish in tanks to consider how their body structures are related to their behaviors and habitats.

$5 - $10 per group Ages 4 - adult 10 to 30 minutes
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Exponga estos pósteres en el salón o déjelos donde los chicos los puedan explorar. Los chicos buscan las respuestas en línea, en libros de consulta, y en calendarios y almanaques.

free Ages 4 - adult 10 to 30 minutes
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In this activity, learners will create beautiful greeting cards by marbling with shaving cream and food dye. They will explore the chemistry behind the art of marbling.

$5 - $10 per group Ages 4 - adult 30 to 45 minutes
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In this outdoor activity and observation game, learners hunt for a variety of textures, colors, odors and evidence of organisms in the activity site.

$5 - $10 per group Ages 4 - adult 30 to 45 minutes
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In this activity, learners set up a night time insect observation station with a light and sheet.

$5 - $10 per group Ages 4 - adult 30 to 45 minutes
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In this activity, learners will use string and salt to lift an ice cube out of a glass of water. Salt depresses the freezing point of water, allowing it to melt around the string and refreeze.

1 cent - $1 per group Ages 4 - adult 10 to 30 minutes
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When was the last time you took a really close look at a leaf? In this activity, learners will use leaves and simple materials to make colorful leaf rubbings.

$1 - $5 per group Ages 4 - adult 5 to 10 minutes
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In this activity, learners will explore the ways natural materials can produce sounds. Appropriate for any age, learners can make individual music or create a symphony with others.

free Ages 4 - adult 10 to 30 minutes
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In this activity, learners investigate just how small a billionth of a meter is by attempting to cut a paper ruler down to a nanometer-sized sliver.

1 cent - $1 per student Ages 4 - adult 5 to 10 minutes
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In this activity, learners discover how a super-absorbing material can be used to move a straw.

$10 - $20 per group Ages 4 - adult 5 to 10 minutes
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In this demonstration about momentum, use physics to distinguish between a hard-boiled egg and a raw egg without cracking them open.

1 cent - $1 per group Ages 4 - adult Under 5 minutes
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In this activity, learners will build a design and build a place for pollinators to drink from.

$1 - $5 per student Ages 4 - adult 1 to 7 days
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In this activity, learners will discover what it takes to be a frog. By dressing up like one, learners can visualize how each part of the frog plays an important role in surviving its habitat.

$10 - $20 per group Ages 4 - adult 10 to 30 minutes
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In this physics demonstration, learners are challenged to break a raw egg just by squeezing it. Learners will be shocked by their inability to complete the deceivingly simple challenge.

1 cent - $1 per group Ages 4 - adult Under 5 minutes