Smile

From Academic Kids

This article is about a smile as a physiological phenomenon. For information on the album, see Smile (album); for the popular song, see Smile (song);for the musical, see Smile (Musical) and for the bank, see smile (bank). Smile was also the name of the band later known as Queen. The simplified molecular input line entry specification or SMILES is a specification for unambiguously describing the structure of chemical molecules.

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Smile.jpg
Smiling woman

In physiology, a smile is a facial expression formed by flexing muscles most notably near both ends of the mouth, but also around the eyes. Among humans, it is customarily an expression of pleasure or amusement, but can also be an involuntary expression of anxiety. Studies have shown smiles to be a normal reaction to certain stimuli and occur regardless of culture, and is also not a reaction one learns, but is born with, as children blind from birth smile. Among animals, the exposure of teeth, which may bare a resemblance to a smile, are often used as a threat - known as a snarl - or a sign of submission.

Smiling not only changes a facial expression, but can also make the brain produce endorphins which reduces physical and emotional pain, and give a greater sense of well-being.

Types of smiles

Researchers have identified a number of different types of smiles.

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Smilingguy.JPG
Smiling man


References

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