During the school year of 2008 – 2009 was organized the third edition of the science fair at Externato Maria Auxiliadora, in Viana do Castelo, Portugal. This fair involved students from the 5th grade to the 9th grade (ages between 10 and 15 years old). On previous years students had the opportunity to work, at school, with the responsible teachers during lunch time. On this edition, students had also the opportunity to work, in some occasions, in their projects in “Área de Projecto” and in the Science Club. The effort of the science teachers that organized this event for the third time was reduced by the involvement of these non-disciplinary areas. This fact, associated to the experience that students acquire along this years, by particip...