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If I were a con artist, I’d get in the habit of buying people warm drinks. If that didn’t work, I’d start conducting my con in warm rooms, or maybe move to a tropical region. Why? Because fleeting feelings of heat increase our willingness to trust strangers. That, at least, is the conclusion of a clever new paper from the Bargh lab, which measured the effect of temperature on interpersonal interactions. It’s yet another reminder that even...