Theodore Maiman, who built the first working laser, passed away on 5 May aged 79. Maiman made his breakthrough in 1960 by generating pulses of coherent light from a fingertip-sized lump of ruby ...

Light's shadow: Researchers showed that a laser beam can sometimes act like a solid object and cast a shadow that is visible to the naked eye. In the picture, the shadow appears as the horizontal line ...

In the past half-century, lasers have gone from expensive physics experiments using rods of ruby to cheap cutting or engraving tools, and toys used to tease cats. Advances in physics made it all ...