Images of images of images can appear to repeat forever.
Use gelatin as a smoked lens, to view total internal reflection, and as a color filter.
Pencil, pin, paper = phonograph.
Without a boundary, it's hard to distinguish different shades of gray.
Why is the sky blue? That's a sticky question.
Prove to yourself that Galileo was right!
Caged molecules do their thing.
Substitute coins for radiation.
Find out one reason that buildings aren't equal in an earthquake.
Now you see it; now you don't. An object without a sharp edge can fade from your view.
Make it stick.
Your pupil changes size to control how much light enters your eye.
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