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Why is the sky blue? That's a sticky question.
Without a boundary, it’s hard to distinguish different shades of gray.
What happened to your whole hand?
Focus the invisible light from an electric heater.
See an invisible infrared beam.
Why the world gets dark so fast outside the circle of the campfire.
Gelatin can do much more than just wiggle and jiggle.
Which is in control, your eyes or your brain?
Even plants have their favorite colors.
Explore the behavior of common night-lights controlled by photocell sensors.
Build a simple wind generator.
Images of images of images can repeat forever.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Attribution: Exploratorium Teacher Institute
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