"within a factor of 10" is a curiosity rather than anything of real significance. And even that is based on untested theories. It is possible that the Planck

"within a factor of 10" is a curiosity rather than anything of real significance. And even that is based on untested theories. It is possible that the Planck length will end up being significant in the way described upthread, but given our scientific record it seems somewhat more likely that such an idea will end up looking similar to the theory about atoms being the smallest unit of matter.