The material on this web site is copyrighted. It is not entirely free. You cannot simply copy articles and place on another site, nor can you take them and put them into a book without prior permission.
You can, however, copy reasonable snippets – a few paragraphs of an article – to put in your article as long as you link to the original source.
You can also make as many hard copies as you like of any article for handing out to friends, family, politicians, etc.
You can also copy articles in an email as long as the source is cited, and the email is not spam.