I believe your parent was referring to the Plank Length when he said the physical world. http://en.wikipedia.org/wiki/Planck_length http://en.wikipedia.org/wik

I believe your parent was referring to the Plank Length when he said the physical world. http://en.wikipedia.org/wiki/Planck_length http://en.wikipedia.org/wiki/Planck_length Of course, that's being super pedantic, because 10^31 is practically infinite, or at least more than you'll have time to try in your lifetime.