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Without a boundary, it’s hard to distinguish different shades of gray.
Use your skin and different metals to create a battery.
Focus the invisible light from an electric heater.
How do you put a straight rod through a curved slot?
Why the world gets dark so fast outside the circle of the campfire.
There’s more to seeing than meets the eye.
Explore the behavior of common night-lights controlled by photocell sensors.
Images of images of images can repeat forever.
See pictures in thin air.
Copper coils become electromagnetic swings.
Ding dong! This investigation shows how your doorbell works.
A face seen upside down may hold some surprises.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Attribution: Exploratorium Teacher Institute
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