I asked these questions elsewhere but on second thought they make much more sense together. 1. If particles can move around in seemingly random ways, are they maintained within an object or is there occasional 'jumping out' of particles from within that object? By an object I mean something like a table, a person's body, a rock....is it the case that at any one time certain particles are moving out of the object and certain objects in? If anybody could give any insight on this it would be much appreciated! 2. We are not able to determine the position AND the momentum of a particle at any given time, but however, that does not mean that the particle does not have position AND momentum at any given time. Is this right? If so, then, to find out if a particle was moving 'randomly' we'd have to know whether for any given momentum and position it would move to different positions at different times. However, this is impossible because of the uncertainty principle. Any comments on the above?