True, Some of the supermarket cheats found a way of avoiding the ten items or fewer rule., Both the Dutch and American research prove that people are helped by positive thinking., It is possible that certain sounds make people look and feel cheerful., False, The aim of Trinkhaus's research was to investigate the behaviour of women van drivers., Trinkhaus believes that women van drivers drive faster than men on purpose., Dutch psychologists carried out an experiment using professors and football hooligans., The world's funniest joke was one about animals..

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