Happy Birthday, Mr Laser, Happy Birthday ... to ... you Answered
OK, so it's hard to do an impression of Marylin Monroe in a topic title.
Today, is, according to google, the anniversary of the invention of the laser. First demonstrated in 1960, it was known as a solution looking for a problem - everybody agreed it was clever, but it took some time before it saw a practical use. Now, every single "western" home has at least a handful of lasers, ad they have seen duty everywhere from art to war, via medicine and astronomy.
Time to have a quick review of how this tricksie piece of hardware (especially the LED variety) has been treated by our members:
Laser vortex from this Instructable
Google's laser results