What did the workers in the 1966 US laboratory believe was causing their itching?, What evidence made investigators doubt that “cable mites” actually existed?, What was eventually identified as a possible physical cause of the laboratory workers' skin irritation?, What was unusual about the way the problem spread among workers in the textile factory?, Apart from insects, what environmental factors does the author say can create the sensation of imaginary insects?, What does the author mean by “reflex contagion”, and what everyday example is given?, According to Dr Paul Marsden, why might contagious scratching have been useful to humans in evolutionary terms?, Why does the author suggest that the workers in all three cases may have been particularly vulnerable to this phenomenon?, Why is treating illusory parasitosis difficult?, How might the Internet make the problem worse, according to the final paragraph?

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