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This perception trick focuses on conflicting information to the brain...instead of trying to see two images, you're trying to get a bright spot by overlapping the image you see through two tubes.

1 cent - $1 per student Ages 4 - 11 Under 5 minutes
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In this activity, learners build bridges out of newspaper and tape to explore how structures are designed to bear loads.

1 cent - $1 per group Ages 4 - 11 2 to 4 hours
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In this activity, learners work together to make polygons (many-sided shapes) with string. Learners sit on the floor and hold onto a piece of string slid between their thumbs and index fingers.


1 cent - $1 per group Ages 4 - 8 30 to 45 minutes