If you rotate a pair of polarizing sunglasses, you will find that they cut road glare much better in some positions than in others.

When light reflects from water, asphalt, or other non-metallic surfaces, it becomes polarized. That is, the reflected light is usually vibrating more in one direction than in [...]

What you see is often affected by what you expect to see.

When your brain expects to see one thing and is presented with something quite different, you will feel some peculiar sensations.

2 mirrors, Your brain is fooled into thinking that the image it sees in the mirror is [...]

You can make glass objects disappear.

Glass objects are visible because they reflect some of the light that shines on them and bend or refract the light that shines through them. If you eliminate reflection from and refraction by a glass object, you can make that object disappear.

Wesson™ oil. When [...]

This cylindrical mirror lets you see yourself as others see you.

A flat mirror will always reflect an image that is right-side up and reversed right to left. A cylindrical mirror can produce images that are flipped upside down and images that are not reversed. The image you see in a cylindrical mirror depends on [...]

Make a friend disappear, leaving only a smile behind.

Under most circumstances, both of your eyes receive fairly similar views of the of the world around you. You fuse these views into a single three-dimensional picture. This Snack lets you explore what happens when your eyes receive different images.

A handheld mirror, approximately 4 to 6 [...]