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Originally posted by: Jeten San Hett
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Edit: Talking about scientific ridiculness, have you ever thought that a Laser beam should not be visible to anyone unless you are the one being killed by it?

What do you mean?

And also, you couldn't concentrate a beam of light for that length. Another thing is that when they start up, with a real beam of light, it would just turn on, instead of gradually protruding. And light doesn't make a sound.

The fact that distinguishes the Laser beam from any other light beam is that all photons have paraller (or almost parallel) courses. That trait makes laser so usefull, because you can point light to a certain direction. As a consequence, a laser beam cannot be visible, because none of the photons ever reaches your eye. If they did, the light beam would not be concentrated. When you "see" a laser beam in dust, what you actually see are the photons that hit a particle and lost their course, and therefore are not anymore part of the laser beam. The only way to see a laser beam, is for it to be pointed to your eye. So, in the case of a laser gun, the only way to see the beam is to be pointed at your eye when if opens fire.