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Nope, polygraphs cannot tell whether you're lying. 1, 2 The polygraphs tries to measure nervosity but registering sweating and, I think, light trembling. They always calibrate the polygraph for each individual by asking questions the subject has no reason to lie about, to generate what is called a honest baseline. The concept has some damning flaws, as no ...

Image Source Charles Darwin - The Expression of the Emotions in Man and Animals A man when moderately angry, or even when enraged, may command the movements of his body, but ... those muscles of the face which are least obedient to the will, will sometimes alone betray a slight and passing emotion. David Matsumoto - Study Image Source ...

According to the straight dope the white spots (also called leukonychia) are: The precise cause of leukonychia is a mystery. It's said to be more common in the young and in women, and often shows up when the body undergoes stress or trauma, such as a blow to the fingertips. Excessive manicuring can make things worse; so can working in a pickle factory, ...

This answer is really a follow-up to David Hedlund's (correct) answer and the resulting conversation in the comments between David and Sklivvz. A large portion of a polygraph's effectness comes from the fact that the subject believes that it works. In some sense, it's a very fancy prop/placebo. A polygraph test (in an NSA / DoD setting) goes down something ...

Lie detectors measure stress. They are effectively useless in detecting lies. Some people can lie without thinking about it, and some get nervous when they're trying to tell the exact truth. What they are useful for is finding sensitive subjects. A polygraph expert can ask questions and note what subjects seem to be stressful. This can allow the expert ...

The FAA is working towards allowing drones in American airspace in the future, with the support of Congress: FAA Makes Progress with UAS Integration. See also Currently, UAVs can only fly in restricted airspace zones controlled by the U.S. military.

It all depends on how you define "work". Do breathalyzers work? Do pregnancy tests? Polygraphs tests work with a reasonable accuracy for some topics, but not for others. They are not accurate enough for legal purposes, but they are accurate enough if you are trying to confirm other data and use them as support in the confirmation (non-legal).