What you see is often affected by what you expect to see.
When you overlap materials with repetitive lines, you create moire patterns.
How ice skaters, divers, and gymnasts get themselves spinning and twisting faster.
A magnet exerts a force on a current-carrying wire.
It's all done with mirrors.
Test the limits of your peripheral vision.
Your eye and brain hold on to a series of images to form a single complete picture.
By heating a solution of soap, water and food coloring, fluid motion can be visualized.
Who needs expensive optical equipment?
With polarized light, you can make a stained glass window without gla
If you rotate a pair of polarizing sunglasses, you will find that they cut road glare much better in some positions than in others.
Wiggle where you're at.
Your pupil changes size to control how much light enters your eye.
Substitute coins for radiation.
A snack version of Mirror Mirage.
Big swings from little pulls grow.