Photo: #Sports walker Bernardo Segura, left, takes a lie detector test October 9, 2000 in Mexico City, Mexico. The Mexican athlete was disqualified for running in the 20km walk at the Sydney 2000 Olympic Games and lost the gold medal.

The science of lying


Researchers are working to develop a foolproof technology to detect when people are lying. But while such a device could help solve crimes and protect the nation against terrorism, it could also have profound social implications.

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