The European Union Science Olympiad (EUSO) is a team competition for EU secondary school science students who are 16 years of age or younger. It was founded in 2002 by Mr. Michael Cotter. The first EUSO was held in Dublin, Ireland in 2003. Since then the competition has been held every year in one of the participating countries: 2004 in the Netherland, 2005 in Ireland, 206 in Belgium, 2007 in Germany, 2008 in Cyprus, 2009 in Spain, 2010 in Sweden, 2011 in Czech Republic, 2012 in Lithuania, 2013 in Luxembour and 2014 in Greece.The main objective of the EUSO is to challenge and stimulate gifted science students by helping them to develop their talents and promoting their careers as scientists. Not only is EUSO an occasion to meet for top science students from the European Union, it also fosters a positive and high profile image of science and scientists among the wider community.The students have the opportunity of enjoying a stimulating and varied cultural and social programme during their stay. Nonetheless, the competition is the main event of the Olympiad. The competition consists of two sessions during which the students work in teams of three on a specific subject. The tasks are designed so as to test their skills in tackling science problems and dealing with scientific experiments. A scientific jury, formed by the host country, elaborates the tasks. The student teams receive all tasks in their native language; the mentors are responsible for the translations.Luxembourg will participate with two teams (of 3 students each) at the 13th EUSO from the 26th of April to the 3rd of May 2015 in Klagenfurt (Austria).The 6 selected students will be the winners of the national competiton (8. Lëtzebuerger Naturwëssenschaftsolympiad) and they will be trained for this international competition during 7 training sessions in biology, chemistry and physics.