Commenting on the research, Dr Lynne Sneddon, a senior lecturer at the University of Chester and the University of Liverpool, said the research was "thorough" and had been "carried out well".

BBC: Further evidence crabs and other crustaceans feel pain

Chester Quarles, a professor at the University of Mississippi, says the Klan has transformed itself in recent years.

ECONOMIST: The Ku Klux Klan