A look at some of the flawed thinking that prompts people who believe in certain non-scientific concepts to advise others who don't to be more open-minded. music © QualiaSoup . A note on spelling: A number of people have commented that 'close-minded' should be spelt 'closeD-minded'. This is incorrect. It's one of those cases in English where what you might suspect to be the case, isn't. The term is 'close-minded', in the same way that when one is reticent, one is said to be 'close-mouthed', not 'closeD-mouthed'.