"And, of course, what Al said ... but you are confusing things. Zero rest mass has absolutely nothing, nada, zilch, to do with whether something is divisible"

Okay, so maybe I didn't research the proper scientific meaning of mass. Consider this then, a simple, easy to visualise example. I weigh 62Kg -on earth; divide that by two till you reach a ridiculously small number, call it x. Now let's say that x is what the smallest particle ever or ever-to-be discovered weighs -on earth. x is without a doubt greater than zero, therefore it can be divided by two to produce a positive number. So when I do this and get a new number, z, I am asking what z is the weight of -on earth.