Is there a way to know one way or another? If smallest possible scale is Planck scale, does it mean that space-time is discrete where smallest possible step is Planck's length (PL) and smallest possible time is Planck's time (PT)? If I move my hand from point A to point B, say 1m exactly in 1s, how many steps have I made? 1m/PL and for each step I spent PT? So, from that viewpoint my hand made those steps with the speed of light?