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China. all kinds of speculation, focused on some sort of sonic attack. now, scientists who led the investigation tell the "new york times" they believe the main culprit, likely to be some kinds of microwave weapon. patrick oppman is following the developments for us in havana. patrick, microwave weapon? can you explain that? >> reporter: yes. well, you know, there are weapons that do exist unconventional weapons that use radiation, microwaves. and they concentrate them and they can used for crow...