light

The first picture an expecting mother is likely to see of her developing fetus is not, technically, a picture at all. Most likely, it's an ultrasound image, produced by technology that has more to do with hearing than with seeing.

Some photos appear normal, except for an unearthly red color glowing from the pupils of your loved ones' eyes. Are Grandma and Uncle Felix possessed, or is there some other explanation for this red-eye phenomenon?

It can be hard to grow plants indoors, especially in a room without a lot of sunlight. Sometimes it's just a matter of choosing the right plant, though.

Why does the sunset take more time than the sunrise? It takes much less time for the sun to light up the sky at dawn than it does for all the light to disappear after the sun sets at dusk.

Did you know that moths are a lot less attracted to artificial light than they used to be? Huge numbers of moths die from flying toward artificial lights and accidentally frying themselves.

We are closer than ever to finding inhabited worlds. When an alien planet passes in front of its star, an event that's called a transit, there is a small dip in the intensity of starlight that astronomers use to detect the planet.

Have you ever wondered why fluorescent colors like the ones you see in highlighers or clothing dyes seem so much brighter than other colors? It's because they seem to reflect more light than they receive.

Things are not always as they seem, and this little demonstration will prove it. All you need is a cup of black coffee and an overhead light.

Computers would be much faster, smaller, and consume less energy if they used light signals instead of electrical signals. That's why many scientists are racing to figure out how to make computers that use light.