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Your visual system uses edges to detect differences.
What happened to your whole hand?
Your brain adapts quickly to a warped view of the world, turning baskets into air balls.
This curved mirror focuses both light and heat.
Focus the invisible light from an electric heater.
Swirling, drifting, billowing movements of air reveal themselves in the fog.
Lenses transmit an image of your face across space.
See an invisible infrared beam.
Light gets dimmer the farther it travels–and a bit of simple math explains how.
Why the world gets dark so fast outside the circle of the campfire.
Cheer on the competitors in this zany science cook-off.
Gelatin can do much more than just wiggle and jiggle.
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