Happiness is considered very important in life. Why is it difficult to define? What factors are important in achieving happiness?

Even high-tech lie detectors

don’t

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detect lies as

such

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; they merely detect the physical cues of emotions, which may or may not correspond to what the person being tested is saying. Polygraphs,

for instance

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, measure respiration, heart rate and skin conductivity, which tend to increase when people are nervous – as they usually are when lying. Nervous people typically perspire, and the salts contained in perspiration conducts electricity. That’s why sudden leap in skin conductivity indicates nervousness -about getting caught, perhaps -which makes, in turn, suggest that

someone

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is being economical with the truth.

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, it might

also

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mean that the lights in the television Studio are too hot- which is one reason polygraph tests are inadmissible in court. “Good lie detectors

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rely on a single thing

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says Ekma ,but interpret clusters of verbal and non-verbal clues that suggest

someone

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might be lying.” The clues are written all over the

face

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. Because the musculature of the

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is directly connected to the areas of the brain that processes emotion, the countenance can be a window to the soul. Neurological studies even suggest that genuine emotions travel different pathways through the brain than insincere ones. If a patient paralyzed by

s

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troke on one side of the

face

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,

for example

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, is asked to smile deliberately, only the mobile side of the mouth is raised. But tell that same person a funny joke, and the patient breaks into a full and spontaneous smile. Very few people -most notably, actors and politicians- are able to consciously control all of their facial expressions. Lies can often be caught when the

liars

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liar's

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true feelings briefly leak through the mask of deception. We

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think before we feel, Ekman says. “Expressions tend to show up on the

face

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before we’re even conscious of experiencing an emotion.” One of the most difficult facial expressions to fake- or conceal, if it’s genuinely felt - is sadness. When

someone

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is truly sad, the forehead wrinkles with grief and the inner corners of the eyebrows are pulled up. Fewer than 15% of the people Ekman tested were able to produce

this

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eyebrow movement voluntarily.

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, the lowering of the eyebrows associated with an angry scowl can be replicated at will but almost everybody. “ If

someone

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claims they are sad and the inner corners of their eyebrows

don’t

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go up,

Ekmam

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Ekman

says, the sadness is probably false.”