Some explanations seem to say that a wave is the superposition of a particle. It is all the possible positions of a particle simultaneously, and when it collapses into a definite state, that is the particle. Other explanations say that when measuring a particle, it is a matter of measuring the density of a wave where the particle is most likely to be found at any given time, but exactly pinpointing it with the accuracy associated with classical physics cannot really be done. The next measurement might show something different.
But, to steer this back to the topic so we don't hijack PQ's thread, would you say that the text I quoted from another forum is obscure because of it's subject or because of the way it is written?