Forget the elevated pulses, sweaty palms, and respiration changes scrutinized by conventional lie detector tests. There's a more direct and, in theory at least, accurate way to measure deceit: track the flow of blood where the lie is born. Lying requires an extra bit of thought, which pulls more blood into a swath of the brain just beneath the forehead. These flows can be tracked optically. And biophysicist Britton Chance-who 60 years ago was part of the wartime research team that developed radar at MIT's Radiation Laboratory-is pioneering technology that can literally see a lie as you speak it. He believes the method is better than conventional tests because the flows can't be suppressed and are less likely to have been caused by the stress of test-taking.

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