9/11 kerosene, oh, sorry, benzene cased bone marrow cancer in ground zero responders. Oh, no, no! don't get me wrong! I do not insist it was radiation that caused leukemia that required bone marrow transplantation in ground zero responders. That was, of course, benzene (not kerosene, that melted the steel of Twin Towers into fluffy microscopic dust, but benzene, do not miss the point!) that persisted on that ground zero, as the U.S. officials and even doctors assure you. Definitions of “ground zero” in dictionaries printed prior to September 11, 2001: - see them in the very first "pinned" comment under this video. If you want to see the original pages of the pre-9/11 dictionaries with these ground zero definitions,