It is hard for kids to imagine that everything they see and use was once invented by someone. From computer games to ball point pens, Teddy bears to drinking straws, I Wonder Why Zippers Have Teeth clues kids into the behind-the-scenes people and stories behind many objects they use every day. The question and answer format is great for further discussion, the entertaining pictures keep the pages turning. It will change the way readers think about the things they use, and hopefully inspire a few to dream up some new ones