Just noticeable difference (JND) describes the marginal difference in a stimulus (compared to a similar stimulus) needed for that difference to be perceived. Also mathematically represented as: That's a freight train of earth-shatteringness, right? In blogging lingo, it means you can't just be different from other blogs. You have to be sufficiently different in some aspect for that differenceto be noticed by readers. Just like trees falling in an empty forest,