Sometime back I had a discussion with my friend about baby-diapers. The basic function of a diaper is to collect the baby's output and make him feel comfortable always. But our discussion was, what will make the mom know that it has become wet, so that she could clean up the baby?
My Friend gave a suggestion out of his wildest thoughts. His notion was -how about fitting LED's in the diaper such that the bulb glows when it comes in contact with the wetness. By this way whenever the diaper becomes wet the LED will glow , and the baby will move here and there with the LED glowing. And mom will naturally know that she has to replace it with a new one!!!