Since no matter can be created or destroyed (excluding nuclear and
cafeteria substances), as one attempts to remove unwanted material
(i. e., trash) from one's living space, the remaining material mutates
so as to occupy 30 to 50 percent more than its original volume.
cosmic rays n.
Notionally, the cause of bit rot.
However, this is a semi-independent usage that may be invoked as a
humorous way to handwave away any minor randomness that
doesn't seem worth the bother of investigating....