Do Science Fair Projects Actually Help "Teach" Science?

I think Science Fair Projects do help teach science in some ways. It's a good way for students to get involved in science because they can pick many different topics that they like. For example, my science fair project is how gravity effects the growth of plants. That project would most likely teach me more things about plants and how they grow and how gravity effects plants. Also, if the student picks a topic they like, they would do a lot of research on it without really knowing that they are learning something.