Just know this site from detik.com.
for you guys who need to know everything about your subject in school just clik WIKIVERSITY
Create and host free content, multimedia learning materials, resources, and curricula for all age groups in all languages
Develop collaborative learning projects and communities around these materials
Learners and teachers are invited to join the Wikiversity community as editors of this wiki website where everyone can edit the pages. The community portal lists information about many aspects of Wikiversity.