Smile

A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a "Duchenne smile". Smiles performed without the eye contraction can be perceived as "fake".

Among humans, smiling is an expression denoting pleasure, sociability, happiness, or amusement. It is distinct from a similar but usually involuntary expression of anxiety known as a grimace. Although cross-cultural studies have shown that smiling is a means of communication throughout the world, there are large differences between different cultures, with some using smiles to convey confusion or embarrassment.

Historical background

Primatologist Signe Preuschoft traces the smile back over 30 million years of evolution to a "fear grin" stemming from monkeys and apes who often used barely clenched teeth to portray to predators that they were harmless. The smile may have evolved differently among species and especially among humans. Apart from Biology as an academic discipline that interprets the smile, those who study kinesics and psychology such as Freitas-Magalhaes view the smile as an affect display that can communicate feelings such as love, happiness, pride, contempt, and embarrassment.

Smile! (novel)

Smile! is a children's book by Geraldine McCaughrean. In 2004 it won the Nestlé Smarties Book Prize Bronze Award.

References

Smile (The Beach Boys album)

Smile (occasionally typeset as SMiLE) was a projected album by American rock band the Beach Boys intended to follow their 11th studio album Pet Sounds. After the group's songwriting leader Brian Wilson abandoned large portions of music recorded between 1966 and 1967, the band recorded and released the dramatically scaled-down Smiley Smile album in its place. Some of the original Smile tracks eventually found their way onto subsequent Beach Boys studio and compilation albums. As more fans learned of the project's origins, details of its recordings acquired considerable mystique, and it was later acknowledged as the most legendary unreleased album in the history of popular music.

Working with lyricist Van Dyke Parks, Smile was composed as a multi-thematic concept album, existing today in its unfinished and fragmented state as an unordered series of abstract musical vignettes. Its genesis came during the recording of Pet Sounds, when Wilson began recording a new single: "Good Vibrations". The track was created by an unprecedented recording technique: over 90 hours of tape was recorded, spliced, and reduced into a three-minute pop song. It quickly became the band's biggest international hit yet; Smile was to be produced in a similar fashion. Wilson touted the album "a teenage symphony to God," incorporating a diverse range of music styles including psychedelic, doo-wop, barbershop singing, ragtime, yodeling, early American folk, classical music, and avant-garde explorations into noise and musical acoustics. Its projected singles were "Heroes and Villains", a Western musical comedy, and "Vega-Tables", a satire of physical fitness.

Cho

Cho may refer to:

Surnames

Given name

Aldehyde

An aldehyde /ˈældᵻhaɪd/ or alkanal is an organic compound containing a formyl group. The formyl group is a functional group, with the structure R-CHO, consisting of a carbonyl center (a carbon double bonded to oxygen) bonded to hydrogen and an R group, which is any generic alkyl or side chain. The group without R is called the aldehyde group or formyl group. Aldehydes differ from ketones in that the carbonyl is placed at the end of a carbon skeleton rather than between two carbon atoms. Aldehydes are common in organic chemistry. Many fragrances are aldehydes.

Structure and bonding

Aldehydes feature an sp²-hybridized, planar carbon center that is connected by a double bond to oxygen and a single bond to hydrogen. The C-H bond is not acidic. Because of resonance stabilization of the conjugate base, an α-hydrogen in an aldehyde (not shown in the picture above) is far more acidic, with a pKa near 17, than a C-H bond in a typical alkane (pKa about 50). This acidification is attributed to (i) the electron-withdrawing quality of the formyl center and (ii) the fact that the conjugate base, an enolate anion, delocalizes its negative charge. Related to (i), the aldehyde group is somewhat polar.

Cubohemioctahedron

In geometry, the cubohemioctahedron is a nonconvex uniform polyhedron, indexed as U₁₅. Its vertex figure is a crossed quadrilateral.

It is given Wythoff symbol 4/3 4 | 3, although that is a double-covering of this figure.

A nonconvex polyhedron has intersecting faces which do not represent new edges or faces. In the picture vertices are marked by golden spheres, and edges by silver cylinders.

It is a hemipolyhedron with 4 hexagonal faces passing through the model center. The hexagons intersect each other and so only triangle portions of each are visible.

Related polyhedra

It shares the vertex arrangement and edge arrangement with the cuboctahedron (having the square faces in common), and with the octahemioctahedron (having the hexagonal faces in common).

Tetrahexagonal tiling

The cubohemioctahedron can be seen as a net on the hyperbolic tetrahexagonal tiling with vertex figure 4.6.4.6.

Hexahemioctacron

The hexahemioctacron is the dual of the cubohemioctahedron, and is one of nine dual hemipolyhedra. It appears visually indistinct from the octahemioctacron.