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In this chemistry challenge, learners combine acids and bases in a universal indicator to create five different colors.

Over $20 per group Ages 4 - 14 10 to 30 minutes
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On an imaginary fossil hunt, learners "find" (remove from envelope) paper "fossils" of some unknown creature, only a few at a time.

1 cent - $1 per group Ages 8 - 18 10 to 30 minutes
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In this activity, learners create channel features with flowing water, comparing their observations to real images of Mars and Earth taken by satellites/orbiters.

Over $20 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners design, build and test wind turbines. Learners go through the design process and use the scientific method to test important blade variables.

Over $20 per group Ages 8 - 18 2 to 4 hours
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In this outdoor activity and game, learners roundup a "herd" of hopping insects and find out how many different kinds or species are in their herd.

$10 - $20 per group Ages 8 - 14 45 to 60 minutes
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In this demonstration, learners investigate mass, gravity, and acceleration by dropping a wooden bar with a balloon attached to its underside, a mass suspended from it by rubber bands, and a sharp-poi

$5 - $10 per group Ages 11 - 18 5 to 10 minutes
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This activity was designed for blind learners, but all types of learners can explore means of physically separating a mixture using dissolving, filtration, and evaporation.

$1 - $5 per group Ages 11 - 18 10 to 30 minutes
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In this activity (on pages 16-21), learners get a sense of geological time by understanding how big a million is.

$1 - $5 per group Ages 8 - 14 1 to 2 hours
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Data in computers is stored and transmitted as a series of zeros and ones. Learners explore how to represent numbers using just these two symbols, through a binary system of cards.

$1 - $5 per student Ages 8 - 14 45 to 60 minutes
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In this activity (on pages 2-8), learners experience how scientists use classification in their study of animals.

1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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In this space science activity, learners work together to create a human-powered orrery to model the movements of the four inner planets.

$5 - $10 per group Ages 11 - 14 10 to 30 minutes
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In this activity related to rotational inertia (page 1 of the PDF under SciGirls Activity: Microgravity), learners will use a bit of scientific experimenting to test if open-faced peanut butter sandwi

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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This activity (page 2 of the PDF under SciGirls Activity: Double Dutch) is a full inquiry investigation into whether hearing or seeing has a bigger effect on jump rope performance.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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In this math-based activity, learners model the intensity of light at various distances from a light source, and understand how astronomers measure the amount of sunlight that hits our planet and othe

$1 - $5 per group Ages 11 - adult 45 to 60 minutes
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In this activity (page 59 of the PDF), learners spin and observe false eyelashes in jars of water (prepared at least 1 day ahead of time) to investigate the effects of different types of motion on the

$1 - $5 per group Ages 8 - 18 45 to 60 minutes
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This activity has learners interacting with live crayfish, but could be adapted for a variety of similar hardy and interesting organisms.

Over $20 per group Ages 4 - adult 10 to 30 minutes
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In this activity, learners make their own flip book that shows real solar flares erupting from the Sun in November 2000. Step-by-step instructions are included with photos.

$1 - $5 per group Ages 6 - adult 5 to 10 minutes
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This activity uses LEGO® bricks to represent atoms bonding into molecules and crystals. The lesson plan is for a 2.5 hour workshop (or four 45-minute classes).

Over $20 per group Ages 11 - adult 2 to 4 hours
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In this activity, learners test to see if carbon dioxide is present in the air we breathe in and out by using a detector made from red cabbage.

Over $20 per group Ages 8 - adult 10 to 30 minutes
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In this activity, learners drop impactors onto layers of graham crackers!

$5 - $10 per group Ages 8 - 14 10 to 30 minutes