Both urban and rural schools may organize clubs, but this is left to teachers. Dance clubs, school sports, traditions and story telling, drama, music, applied physics or chemistry and even math clubs are popular, depending on the teachers organizing. However, participation in these clubs will not be mentioned on any diploma or certificate, nor is it required. Contests between schools exist, as well as nationwide academic contests (known as "olimpiade" – olympiads) being used to promote the best students. These contests are highly popular, as they bring many advantages to the students taking part in them (like the ability to legally skip school for a longer period of time without punishment, easier evaluation at all other subjects, a different, better treatment from teachers, free trips and holidays, better preparation for the final exams – as these are structured like an exam) with whole classes taking part in the lower phase of such contests. Additionally, many Physical Education teachers organize intramural competitions and one or two day trips to the mountains. Other teachers usually also organize such trips and even whole holidays during the summer – camps ("tabere") – this being a Romanian school tradition. However, field trips or research trips are not common (one or two every year), and are usually visits to museums or trips to natural habitats of various animals or plants, to gather information for a school project.