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I really don't think there's a way to include their page in your site without the left column. Too bad they don't provide an RSS feed per topic, but that would probably kill their database.
Options:
1. You could use a links module like mylinks or weblinks and have their page displayed in a frame on your site. You'd have to do some tweaking on the myheader.php file to make it look more presentable. You'd also probably be better off putting the link to the page in a custom block rather than allowing the module to display in your main menu. One problem with this method is that people will be able to sign in to Wikipedia, but it becomes a constant cycle of logging in everytime they change pages. There is a link of the frame header that allows it to be turned off.
2. You could use the tinycontent or edito module to wrap the Wikipedia page into your site. You'd need to make your left column invisible for the module, or you'll have a scroll bar at the bottom of your browser window.
I don't think the second option would make a very attractive presentation, but it will work. Best bet would be option 1.
gestroud