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This is a lesson plan for an activity in which learners, playing the role of archeologists, use math concepts about number bases to decipher the Dresden Codex, an ancient Mayan document.

1 cent - $1 per group Ages 8 - adult 2 to 4 hours
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The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water.

1 cent - $1 per student Ages 6 - adult 10 to 30 minutes
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Learners use Benedict’s solution and heat to test for the presence of simple sugars in glucose, sucrose, starch, and starch combined with amylase.

$5 - $10 per group Ages 11 - adult 10 to 30 minutes
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In this activity, participants will learn about how gigantic clouds of gas and dust in space, called nebulas, are formed. They'll create their own colorful model nebula using paint and a spinner.

Over $20 per group Ages 4 - adult 5 to 10 minutes
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In this activity, learners investigate what happens when you build up static electricity on plastic balls.

$10 - $20 per group Ages 4 - adult 5 to 10 minutes
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In this activity, learners explore the concept of density-driven currents (thermohaline circulation) and how these currents are affected by climate change.

$10 - $20 per group Ages 8 - adult 1 to 2 hours
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Lakes, streams and other freshwater bodies are a habitat for lots of living things, big and small.

$10 - $20 per group Ages 8 - adult 10 to 30 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 activity, learners manipulate film to create homemade movies. Scratch Film, also known as Direct Animation, is the process of drawing and scratching designs directly onto film.

Over $20 per group Ages 11 - adult 2 to 4 hours
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In this activity, learners use binoculars (or a telescope) to identify and track sunspots. If using binoculars, learners need a pair that can be secured on a tripod.

Over $20 per group Ages 8 - adult 10 to 30 minutes
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In this activity, learners build a model of a self-sustaining habitat (growing grass and beans from seeds).

$1 - $5 per group Ages 11 - adult 1 to 7 days
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In this activity, learners explore acids and bases by preparing six solutions that combine vinegar and ammonia, ranging from acid (all vinegar) to base (all ammonia).

$5 - $10 per group Ages 8 - adult Under 5 minutes
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In this activity, learners explore how the application of nano-sized particles or coatings can change a bigger material’s properties.

Over $20 per group Ages 4 - adult 10 to 30 minutes
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In this outdoor activity, learners cut through and investigate rotten logs and then make log-profile puzzles for each other.

Over $20 per group Ages 8 - adult 45 to 60 minutes
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In this field study, learners discover how to collect data in the field and how their efforts can help certain animals, specifically, amphibians.

Over $20 per group Ages 8 - adult 2 to 4 hours
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This multi-part activity from the National Parks Service blends the science of plate tectonics with the culture and history of places with dramatic geologic landscapes.

$10 - $20 per group Ages 11 - adult 1 to 4 weeks
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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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Water treatment on a large scale enables the supply of clean drinking water to communities.

$5 - $10 per group Ages 11 - adult 45 to 60 minutes
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In this activity, learners investigate vitamin C.

$5 - $10 per group Ages 8 - adult Under 5 minutes