Don't ask me for the study, as it was many years ago. I'm sure that if you wanted to, that you could check with a nurse and get her opinion. That's when I switched to the actual orange. You can find all kinds of things for school. I collected many hand puppets this way also.
Kids Are People Too.
This, along with the other things that I've mentioned, helped them to clue in to the fact that they were important. Just thought that I'd throw in the following words of wisdom. If you want your students to respect you, you must respect them. This is VERY important. You'll lose them, if they feel that you are unfair.