Wikipedia runs on a "consensus" system, at least in theory. An article there can be deleted if enough people feel it is unworthy of an encyclopedic article, or if it meets certain other criteria. One complaint some people have with Wikipedia is that the deletion criteria seem to favor the opinions of a select few, rather than a true majority. This could be due to a lack of participation in the processes laid down, though. First of all, anyone can edit wikipedia. So people can put false information, or something innapropriate. Second, people can delete anything.
Duplicate entries will be sent to stand in the naughty children's corner, then deleted.
The Wikipedia copy on Answers.com comes from a "dump" of the Wikipedia database. At the time of the dump it contains all the English entries of Wikipedia. Since Wikipedia grows all the time, the Answers.com copy quickly becomes outdated. Therefore it's fair to assume that the most recent entries [and edits] on Wikipedia are not in the Answers.com copy.
An entry is deleted if the port becomes inactive
in 1926In the early 1900's. See Wikipedia entries for JJ Thomson and Ernest Rutherford.
Because of the financial credit crunch.
http://www.sfweekly.com/2008-02-13/news/wikipedia-idiots-the-edit-wars-of-san-francisco/
Your teacher is right. Anyone can add to the entries and not all are correct. Follow your teacher's advice.
I think only wikipedia itself can only add pictures, if you can though, it is so hard to get it on there without it being deleted for Copyright
Deletionpedia (see related links) is an archive of about 63,308 pages (as of August 2nd 2009) which have been deleted from the English-language Wikipedia.
If you go to the entry on the top right corner, there should be an X click that X and there will be a pop-up, do what it says, and now its deleted.
If the system administrator has blocked certain sites then it is nothing to do with deleted cookies.
To be honest, there is no author in Wikipedia. But, two men named Jimmy Wales and Larry Sanger have created Wikipedia, though the owner now is Wikimedia Foundation. Millions and millions of people write and edit the Wikipedia entries.