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I imagine most of you already know about this site, but for those that don't it is well worth a look. I think I have read every article on the site and learned something new every time.This is a great site full of information and lots of fantastic images too.

Seems I did something wrong inserting the link so for now I will just write it in as not much use telling people about a site with no address

www.blackholesu...dex_US.php