OK, it's not really a black light. It's better to call it what it is: ultraviolet light. Let's start with a quick overview of light. Of course, light is an electromagnetic wave (oscillating electric ...

Don't let poor lighting ruin an otherwise great photo. A portable LED fill light can add the extra dash of illumination you need, and if you don't want to pony up for a new one, you can make your own.

You'll require paper, preferably something colourful and stiff, and a wooden skewer to form the stem of your flower. You'll also need an LED light, a three-volt "coin cell" battery and conductive ...