Hello,
Saudi Arabian authorities censor certain articles on the English and Arabic editions of Wikipedia. A Saudi volunteer did a great job making a list of these articles.
On the English Wikipedia, all currently-known articles are related to sex education, but notability on the Arabic Wikipedia, the article about evolution is censored!
Here is the list:
https://en.wikipedia.org/wiki/Wikipedia:List_of_articles_censored_in_Saudi_A...
--Osama Khalid