When i went to high school, there was a similar project like that. Instead of an egg it was an electronic baby that would cry when it needed a feeding, changing, burping. etc. The students had to carry it around and insert a key into the back of the doll to make it stop crying. The doll had some kind counter or something that would count how many times the baby cried and if the key was inserted signifying that the student had attended to it. I didnt have to do this, i just sometimes had classmates in some classes with the doll. It was annoying as hell when it started to cry.