Andries what I wrote is true. Vassyana has already given many citations for that. However, every line in wikipedia does NOT have to have a citation. Citations are needed for figures, statistics and comparitive measures like oldest, fastest, biggest etc. I will give you an example from the Eiffel tower article. The very first line says, "The Eiffel Tower is an iron tower built on the Champ de Mars beside the River Seine in Paris, France. The tower has become an global icon of France." It does not have ANY citation, because it is so very true, that a citation is unnecessary and needless. The same is the case in this article..