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When it rains, water can collect on top of and seep into the ground. Water can also run downhill, carrying soil and pollution with it.

Over $20 per group Ages 8 - adult 45 to 60 minutes
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In this experiment, learners test multiple food items to see if they are an acid or base using an indicator solution created with red cabbage.

$5 - $10 per group Ages 6 - 14 10 to 30 minutes
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In this group activity, learners consider environmental conditions—temperature, presence of water, atmosphere, sunlight, and chemical composition—on planets and moons in our solar system to determine

1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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The goal of this Star Wars activity is to design and build a balancing device to help an Ewok escape the Imperial Forces by sliding down a tightrope to safety.

$10 - $20 Ages 8 - 18 30 to 45 minutes
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In this activity, learners make their own Sun tracker to explore how ancient civilizations around the world studied the Sun.

$1 - $5 per student Ages 6 - adult 10 to 30 minutes
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In this outdoor activity, learners explore UV rays from the Sun and ways to protect against these potentially harmful rays.

$10 - $20 per group Ages 4 - 18 10 to 30 minutes
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This activity requires a Pico Cricket (tiny computer).

Over $20 per group Ages 8 - 18 4 to 24 hours
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In this activity learners explore surface tension. Why are certain objects able to float on the surface of water and how do detergents break the surface tension of water?

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners construct a simple air pressure launcher for paper rockets.

$10 - $20 per group Ages 4 - 14 1 to 2 hours
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Learners pour equal amounts of coffee, mineral oil, corn syrup, and alcohol into a beaker. The liquids resolve into stacked layers, and learners can infer which liquids are the most and least dense.

$1 - $5 per group Ages 11 - 18 10 to 30 minutes
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In this activity about the heart (on page 22 of the PDF), learners examine sheep or chicken hearts to learn about the heart's structure and the flow of blood through the heart.

$10 - $20 per group Ages 8 - 14 45 to 60 minutes
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In this outdoor activity, learners visit the intertidal zone of a rocky coastal site well populated with marine organisms.

$10 - $20 per group Ages 8 - 18 1 to 2 hours
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In this activity, learners visualize the differences in water density and relate this to the potential consequences of increased glacial melting.

$5 - $10 per group Ages 8 - 14 2 to 4 hours
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In this demonstration, adult learners create a lava lamp using beer and nuts! Use this pub-themed activity to demonstrate the effects of buoyancy and bubbles.

$1 - $5 per group Ages 4 - adult Under 5 minutes
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To discover the risk and protective factors involved in substance addiction, learners play a game of chance to determine whether a fictitious child is likely or unlikely to abuse drugs.

1 cent - $1 per group Ages 11 - 18 30 to 45 minutes
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In this outdoor activity, learners saw sections from fallen trees, then count tree rings and look closely at patterns of tree growth.

$10 - $20 per group Ages 8 - 18 45 to 60 minutes
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When a lot of people share one network (such as cars using roads, or messages getting through the Internet), there is the possibility that competing processes will create a “deadlock," or an interrupt

1 cent - $1 per student Ages 8 - 14 45 to 60 minutes
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In this laboratory exercise, learners will discover how many different plant hosts they can find that are infected by the same genus of a powdery mildew fungus, or how many different genera of powdery

$1 - $5 per group Ages 11 - 18 45 to 60 minutes
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In this crafty chemistry activity (on page 2 of the PDF), learners make their own paper from used paper they may have otherwise thrown away.

$1 - $5 per student Ages 6 - 14 30 to 45 minutes
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A magic lantern is a light that projects an image onto a screen.

Over $20 per student Ages 8 - 18 2 to 4 hours