From the Daily Telegraph:

Liars blink less frequently than normal during the lie, and then speed up to around eight times faster than usual afterwards.

The findings, reported in the Journal of Non-verbal Behaviour, means that blink rates could soon be used by professionals, such as the police and security forces, to tell when someone is being duplicitous.
[...]
“The reasons why there is a flurry of blinks after the lie is not really clear. It may be that this flurry is a kind of safety valve, like a release of energy after the tension of lying.”

With this in mind, let’s take a look at Nancy Pelosi vs. Dick Cheney on Letterman’s “The Blink Count”:

(h/t Michelle Malkin)

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