That how's you tell a person's class?
The wealthy fidget, yawn and generally appear rude, say researchers.
Researchers said those born into privilege may feel less of a need to make a good impression and so are more inclined to fidget when talking to other people.
In contrast, their poorer counterparts are anxious to make a good impression and so are more attentive.
Researchers from the University of California, Berkeley, in the U.S. studied videotapes of 50 conversations between pairs of strangers.
Those from wealthy backgrounds appeared more distracted, playing with their hair, removing flecks of dust from their clothing, fidgeting and doodling.
However, those who were less well off made more of an effort to engage in conversation with the other person, they found.
The study also revealed that when other people were shown clips of the tapes, they were able accurately to guess the person's socioeconomic status based on their body language alone.
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Previous research has shown that those who fidget are less likely to become fat because they are getting valuable exercise without being aware of it.
proving the needlepoint saying You can never be too thin or too rich or apparently too rude.