The fair of sciences is generally a competition in which the participants present their project of science, results in the form of information, bulletin boards and/or models that have created. The fairs of sciences allow that the students of primary, intermediate and secondary schools compete in activities of science and/or technology. The main reason for a fair of sciences is that the students respond to a question or task, not of a text book, but they are discovered to themselves realising a series of experiments and investigations in the short time that is assigned to them. So that the questions or tasks wake up a true interest in the student, they would have to be able to have an interesting and showy project that often is in an exhibition board.

The fairs of sciences also provide a mechanism so that the students with an intense interest in sciences approach mentors of schools and near universities, so that they can accede to the instruction and the equipment that the local schools often cannot provide.

The fairs of sciences go back to 1942, when William Emerson Ritter and Edward W. Scripps created “The Science Talent Search” for students of secondary. The first Feria Nacional de Ciencia of the United States was gained by Alan J. Fletcher when he was 18 years old, winning with an exhibition on the laws of the movement. In the United States, the fairs of sciences became popular at the beginning of the Fifties.