Don't know any famous Belgians outside of Poirot? Are you mad? Do a quick search and you'll find loads.
Gerardus Mercator, Leo Baekeland, Georges Lemaître , Jacky Ickx, Eddy Merckx, Justine Henin. You may have heard of the Smurfs and TinTin to name but a few :-)
Biting the hand that feeds IT
