Make eye contact. Don’t fold your arms. Give a firm handshake. Gesticulate with your palms open. Sit in an “open” position. Interpreting body language—what you can tell about a person from the way they sit, stand or move, regardless of what they’re saying—is a well-established science, commonly used by anyone from recruitment professionals judging whether a candidate displays the qualities demanded by a job, to singles wanting to know whether their charming blind date is really a psycho.

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