to teach children about germs spreading!! put glitter in your hand sanitizer, rub it all over oyur hands the shake hands with child, the glitter spreads from hand to hand. it'll only take a moment before he notices the glitter - then discuss the transfer of germs and that germs are unseen. Go wash your hands, notice that some glitter remains - to get rid of the germs have a discussion about proper hand washing (use soap, wash long enough...)
