Researchers gave 41 participants a cup of hot or iced coffee, without being told it was part of the experiment. They were handed a description of an imaginary person and asked to describe that person. Those who held the hot coffee rated the person significantly warmer — friendlier, more generous — than those who held the ice coffee.
Also, 53 volunteers held hot or cold therapeutic pads and then could choose a gift certificate for themselves or a friend. Those who’d held the hot pads were more likely to give the gift certificate to friends.
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