If your pillow is six years old (apparently average age for a pillow) it has been estimated that one tenth of its weight will be made up of sloughed skin, living mites, dead mites and mite dung.
Bill Bryson
If your pillow is six years old (apparently average age for a pillow) it has been estimated that one tenth of its weight will be made up of sloughed skin, living mites, dead mites and mite dung.