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This year we’re going to be celebrating the 500th edition of The Forum – so we thought we’d give you the chance to ask some of the world’s leading experts to share their knowledge on a topic that you most want to know about. As you can see in the examples below, it could be people or events from history, or anything in the modern world - from pop culture to politics. Send in your ideas and tell us why you have chosen them; TheForum@bbc.co.uk Or join us on Facebook: https://www.facebook.com/Â鶹ÊÓƵAVForum