Host of us tell one or two lies a day, according to scientists who study these things. And we rarely get caught, because the lies we tell are usually little ones: "I got stuck in traffic." "That color looks good on you." "I was just about to call." But even the smallest fib may soon be systematically exposed, at least in the virtual world. Researchers at several universities are developing software that can detect lies in online communications such as instant messages, e-mails and chatrooms.
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