shits real its in the wikipedia.
You do know wikipedia has an edit button.. right? and you
can post and edit anything..
like anything...
Yes, Wikipedia has an edit button and people can edit articles themselves, but there is still a review process, which will in most cases catch nonsense people might add: try editing the relevant articles there to say the Moon landing is nothing but a fake and see how it goes.
That said, people should not take everything they see in the site at face value, and should still go look at the sources in which the information is based; that's why you have the references there.