I was watching a video where well known physicist Lisa Randall said that we still don't know whether space is continuous or discrete. My question is, how do we find whether space is continuous or discrete?? What type of experiments are possible? Is it being done now?? I am thinking this may be connected to elementary particles. So, I am thinking like this: Space will be discrete if we ever found a particle that cannot be divided further. But then that particle also resides inside space, so how can we tell that SPACE is discrete?? How do we do it?