ShepherdsDog ShepherdsDog:
I want physicists to explain why light acts as a wave and a particle, why that damned cat is alive and dead at the same time and why i should believe in the multiverse and alternate realities.
Science does not answer "why" questions. I can tell you "why" we think light exhibits both wave and particle behaviours. A billiard ball is a "particle," and when you shoot it off the bumper, it bounces off in a straight line. So does light off a mirror, thus exhibiting the particle property. However, light can also diffract around an object, exhibiting the wave property. All subatomic particles exhibit both wave and particle properties, but the more massive the object, the shorter the wavelength, and the more difficult it becomes to detect the wave nature. Thus people, and everything that exists on everyday scales, is only seen to exhibit the particle properties.
The cat is only both alive and dead in a thought experiment. It's an analogy and it doesn't work on the macro scale of a real cat, for (in an oversimplification) the reason stated above. But if you actually could have a single particle in a subatomic box, there would be no way of knowing what quantum state it was in until you observed it, even though there are many states it could be in, and it is the act of observation that causes it to collapse into one of the many possibilities.
You should bear in mind, though, that third-year quantum mechanics (where this stuff really gets interesting) was the only physics class I failed.
The "multiverse," as far as I know, isn't a seriously held theory in physics, but it basically goes that when you observe that particle, every state it could be in is observed in different universes. Very useful as a Star Trek plot point, but not seriously held by physicists.
CKA Uber 
CKA Super Elite 
