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In this activity about olfaction (7th activity on the page), learners use natural ingredients to concoct their own perfume.

$1 - $5 per group Ages 8 - 18 4 to 24 hours
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In this activity (on page 2), one person "programs" the other like a robot to move through a space, trying to get them to avoid obstacles and reach a goal.

1 cent - $1 per group Ages 6 - 14 10 to 30 minutes
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In this design challenge activity, learners build a boat that can hold 25 pennies (or 15 one inch metal washers) for at least ten seconds before sinking.

$1 - $5 per student Ages 8 - 14 30 to 45 minutes
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In this activity, learners will repurpose an old t-shirt to create their own yarn or string.

$1 - $5 per student Ages 4 - 14 30 to 45 minutes
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In this design challenge activity, learners build a tower that can support a tennis ball at least 18 inches off the ground while withstanding the wind from a fan.

1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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This activity (on pages 21-32 of PDF) has learners act out several classic brain teasers.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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In this activity, learners conduct a waste audit and use their findings to implement a plan for reducing trash.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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In this activity, learners will estimate how many seeds are in a fruit or vegetable, then count to find out. The result: mix estimation with healthy eating.

1 cent - $1 per group Ages 4 - 14 10 to 30 minutes
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In this activity, learners discover that training a robot can be hard work! Learners investigate how robots complete a task by following a list of sequential instructions.

free Ages 6 - 14 30 to 45 minutes
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In this activity, learners investigate the relative growth of lengths, areas, and volumes as cylinders are scaled up.

$1 - $5 per group Ages 8 - 14 1 to 2 hours
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Learners act as engineers and design mini submarines that move in the water like real submarines.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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In this design challenge activity, learners build a shock-absorbing system that will protect two “astronauts” when they land.

$1 - $5 per student Ages 8 - 14 30 to 45 minutes
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In this quick activity, Dracula has a hole in his house and learners help solve the problem by using a mirror and protractor to reflect incoming light out of his house.

free Ages 8 - 18 Under 5 minutes
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In this activity, learners will use static elecricity to bend a stream of water without touching it. Learners will explore physics and cause and effect through this activity.

1 cent - $1 per student Ages 4 - 14 10 to 30 minutes
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In this activity, learners will build ramps and test how the laws of physics apply do different objects. Learners will explore physics and cause and effect through this activity.

$1 - $5 per group Ages 4 - 14 45 to 60 minutes
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In this activity, learners explore conservation of energy by experimenting with a solar cell light device.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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Have you ever heard of a camera without a lens? In this activity, learners create a pinhole camera out of simple materials. They'll see the world in a whole new way: upside down and backwards!

$1 - $5 per student Ages 8 - 18 45 to 60 minutes
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In this activity, the learner asks yes-no questions to identify a secret object (similar to Twenty Questions). This game is easy to adapt for different ages and different kinds of contexts.

free Ages 4 - 14 5 to 10 minutes
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In this activity, learners explore how engineers design devices that can detect the presence of pollutants in the air.

$10 - $20 per group Ages 8 - 18 1 to 7 days
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In this activity, learners explore the concept of valve operation and how engineers have adapted valves for use in mechanical heart valve design.

Over $20 per group Ages 8 - adult 1 to 2 hours