Lasers are known for the monochromatic nature of their light, so much so that you might never have thought there could be such a thing as a white laser. But in the weird world of physics ...

Combining a green laser, a blue ray laser, and a red laser, he is able to produce a variety of color including white. There are step by step instructions on how to make a multicolored laser.

The technique developed at Heriot-Watt University can instantly tell the difference between dangerous and harmless white powders by pointing a laser at them. It is portable enough to be taken to ...