The European Union Science Olympiad (EUSO) is a unique, multidisciplinary, practice-based team competition in natural sciences. Through the EUSO young students are provided with a platform to work in teams of three to solve relevant science problems of their time and to display their scientific capabilities. This book contains the tasks presented in the five Olympiads of the years 2008 to 2012. The volume contains such diverse topics as energy from light, silk, fruit juice, water, crime investigation, beer, lenses, amber and space exploration.