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A government scientists explains diffraction to a mysterious farmer in the Valley of the Damned! But, could it be the greatest, indeed the last, mistake that he makes in his life? In a land of mutant sheep and sinister choirs, the education of this crazed farmer could be very costly indeed......! The video explains how short wave radio or microwave signals will not diffract around large hills and how this prevent TV signals reaching people in Valleys. The same principle relates to mobile phone signals disappearing in such locations also! Although, aimed at Science GCSE students, my A level Physics students love this video also! The animation also shows very clearly why I have never got a job at Pixar. For best results, always use science geeks in conjunction with text books and revision guides!