At the top of each page is a button that says "edit". Press that, and make your correction.
The correct spelling is "Charles Bonnet syndrome" and there is an article about it in Wikipedia.
According to the wikipedia article for calcium, that's correct.
Wikipedia is user edited. Therefore anyone can put anything on there. For example: in 4th grade someone asked my teacher where spaghetti came from, and (joking, of course) he told them that it grew on trees. He then proceeded to make a wikipedia article about how spaghetti grows on trees. However, there is still lots of correct information, and lots of credible sources.
This will be the User article page.
You can only create a Wikipedia article about people of note. If you are not famous in some way, the Wikipedia editors will remove your article.
I don't know who the author of the Solar Energy article is...but the first edits (Which was most likely the author) was made buy a user account called "EnriquePerez".
At the top of the page, one of the tabs will be "History". Clicking on that will show who who made what changes when.
You can see who made each change to a Wikipedia article by looking at the article's history tab.
No, WikiAnswers is not another version of Wikipedia. Whilst they are both based on wiki technology, their aim is very different: WikiAnswers provides answer to specific questions; Wikipedia is an encyclopedia. It is similar in the way that it uses the 'wiki' format - meaning that anybody can edit the information. Other then that, there are many differences. WikiAnswers is used when the user wants a specific answer to a specific question; Wikipedia is used when the user wants an article on a topic.
Sadly not all of Wikipedia is true. Wikipedia is an online user generated encyclopedia which can be edited by anyone. Some of the people editing have no idea what they are talking about leading to incorrect content. While there are many people on Wikipedia that try to correct these mistakes, they cannot catch all of them.
Good question, since I don't know, i'l guess the article on wikipedia, lol, if there is one.
It depends on which compound interest formula you mean. Refer to the Wikipedia Article on "Compound Interest" for the correct terminology.