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In 1998, scientists studying rheumatoid arthritis observed a population of immune cells that weren’t behaving the way they were supposed to. Immunologists noted the strange phenomenon, but decided not to pursue the subject further, and the cells were soon forgotten. But interest in these...

First impressions count, maybe now more than ever. But what if those impressions are based on lies? People’s willingness to believe even the most outrageous “information” they get is so remarkable that researchers have been studying this phenomenon — more recently given...