Ehh, sorry guys, but it's just not true. The planck constant really doesn't make time & space into grains, i.e. space & time are not quantized at some small limit. It's a very bad assumption on q.m. physicists to believe this, however you cannot blame them, it does seem so.
The planck constant has to do with the limit of light, not the limit of space and time, it's a limit of a wavelength - it's the smallest resolution we can ever see... with the tools we have now, with the particles we use now.
But we can go smaller (maybe). But even if we can't, it does not mean that space & time are discrete in their measurements, and you can believe me on that.
