2. The Demonstration

Like building a model, the "demonstration project" is often discouraged or even forbidden at some science fairs. It does not answer a question through experimentation, but instead illustrates a know scientific principle by demonstrating it. A tornado in a wind tunnel or an "oil drop" model of splitting the atom are examples of a "demonstration" science fair project. This type of project is discouraged because it doesn't challenge the student to think critically about scientific ides, principles or procedures.