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In this simulation of natural selection, learners use binder clips in three different sizes to represent the diversity of beak sizes in a bird population.

$5 - $10 per group Ages 11 - 18 45 to 60 minutes
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In this activity (12th activity on the page), learners conduct an experiment to demonstrate how muscles are constantly feeding information to the brain about what they are doing.

free Ages 8 - 18 5 to 10 minutes
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In this interactive activity, learners analyze seashells to explore phylogeny and evolution. Learners identify similar and dissimilar seashells to create a phylogenetic tree.

free Ages 11 - 18 10 to 30 minutes
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In this activity, learners explore the devices used over time to measure changes in temperature.

$1 - $5 per group Ages 8 - 18 1 to 2 hours
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In this activity, learners construct hand-held altitude trackers. The device is a sighting tube with a marked water level that permits measurement of the inclination of the tube.

$5 - $10 per group Ages 8 - 18 1 to 2 hours
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In this activity, learners apply Ohm’s Law to construct voltage divider circuits. Learners discover how to read resistor codes and calculate resistor values.

Over $20 per group Ages 14 - 18 2 to 4 hours
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Los Momentos de Mixing in Math son actividades de 5 a 10 minutos que mantienen a los chicos ocupados, aprendiendo sobre el mundo, y usando matemáticas por su cuenta.

free Ages 4 - adult Under 5 minutes
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In this activity, learners observe colors in the flame of a burning candle to explore connections between matter, light, color and temperature -- basic concepts of matter and energy.

$1 - $5 per group Ages 14 - 18 45 to 60 minutes
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In this activity, learners explore how engineers use scales and measures when designing a manufacturing process to ensure that final products are uniform in weight or count.

$1 - $5 per group Ages 11 - 18 2 to 4 hours
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In this activity learners will build roller coasters and test them using small balls or marbles.

$5 - $10 per group Ages 4 - adult 10 to 30 minutes
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In this activity, learners explore how anemometers work to record wind speeds and how the equipment has undergone engineering adaptations over time.

Over $20 per group Ages 8 - 18 1 to 2 hours
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In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets.

$5 - $10 per group Ages 6 - adult 10 to 30 minutes
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In this activity, learners will first learn the basics of galaxy classification and grouping.

free Ages 14 - 18 30 to 45 minutes
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In this activity, learners test the Law of Reflection based on experimental evidence. Learners produce raw data and explanations based on their data: pencil tracings of incident and reflection rays.

$1 - $5 per group Ages 14 - 18 45 to 60 minutes
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In this activity, learners use tsunami time travel maps to predict how long it will take a tsunami to reach the shore.

free Ages 14 - adult 1 to 2 hours
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In this activity, learners explore the design of rubber band powered cars. Learners work in teams of "engineers" to design and build their own rubber band cars out of everyday items.

$5 - $10 per group Ages 8 - 18 1 to 2 hours
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In this activity, learners solidify their conceptualization of cells by building a model of a cell in a ziplock bag.

Over $20 per group Ages 11 - 18 1 to 2 hours
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In this activity, learners make their own binary code bracelets by translating their initials into 0s and 1s represented by beads of 2 different colors.

1 cent - $1 per student Ages 8 - 18 10 to 30 minutes
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In this activity (on page 14 of PDF), learners use a pan full of flour and some rocks to create a moonscape.

$10 - $20 per group Ages 6 - adult 10 to 30 minutes
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In this activity, learners will create a diagram of the ocean zones and determine what organisms live in each zone.

$1 - $5 per group Ages 4 - 18 45 to 60 minutes