The Sun is the star of our solar system. The Earth and other matter orbit the Sun, which by itself accounts for more than 99% of the solar system's mass. Energy from the Sun—in the form of insolation from sunlight—supports almost all life on Earth via photosynthesis, and drives the Earth's climate and weather.

The Sun is sometimes referred to by its Latin name Sol or by its Greek name Helios. Its astrological and astronomical symbol is a circle with a point at its center: . Some ancient peoples of the world considered it a planet.The Sun is about 4.6 billion years old and is about halfway through its main-sequence evolution, during which nuclear fusion reactions in its core fuse hydrogen into helium. Each second, more than 4 million tonnes of matter are converted into energy within the Sun's core, producing neutrinos and solar radiation.In about 5 billion years, the Sun will evolve into a red giant and then a white dwarf, creating a planetary nebula in the process.The Sun is a magnetically active star; it supports a strong, changing magnetic field that varies year-to-year and reverses direction about every eleven years.

People who perform composition are called composers. Useful skills in composition include writing musical notation, instrumentation, and handling musical ensembles. The definition of composition has broadened to include extensive techniques such as improvisation, musical montage, preparing instruments, using non-traditional objects or methods of sound production, and make music from silence, as John Cage famously did.

Compositional techniques are the methods used to create music. In discussing the structure or association of a musical work, the "composition" of that work is generally called its musical form. These techniques draw a parallel to art's formal elements. Sometimes, the entire form of a piece is through-composed, meaning that each part is different, with no repetition of sections; other forms include strophic, rondo, verse-chorus, etc. Some pieces are composed around a set scale, where the compositional technique might be measured the usage of a particular scale. Others are composed during performance; techniques are sometimes used, however, in this case also.

The comic strip, also known as a strip cartoon, is a sequence of images. The term has currently become most commonly used when referring to the shortened newspaper comic strip, but historically the term was designed to apply to any strip, there being no upper limit on the length of a strip, the minimum length being two. This usage is still fairly common in the United Kingdom. In the United States the term "comics" is sometimes used to describe the page of a newspaper upon which comic strips are found, and through this usage has also grown to be used as a definition for comic strips.

Newspaper comic strips come in two formats, daily strips and Sunday strips. Daily strips usually run Monday through Saturday, and historically have been presented in black and white, although color is used more often since the early nineties. Sunday strips are much larger and have always tended to be in color.

The stereo or dissecting microscope is designed differently from the diagrams above, and serves a different purpose. It uses two separate optical paths with two objectives and two eyepieces to provide slightly different viewing angles to the left and right eyes. In this way it produces a three-dimensional visualisation of the sample being examined.The stereo microscope is often used to study the surfaces of solid specimens or to carry out close work such as sorting, dissection, microsurgery, watch-making, small circuit board manufacture or inspection, and the like.

Great working distance and depth of field here are important qualities for this type of microscope. Both qualities are inversely correlated with resolution: the higher the resolution,the smaller the depth of field and working distance. A stereo microscope has a useful magnification up to 100×. The resolution is maximally in the order of an average 10× objective in a compound microscope, and often much lower.

In zootomy and dermatology, skin is an organ of the integumentary system made up of a layer of tissues that guard underlying muscles and organs. As the interface with the surroundings, it plays the most important role in protecting against pathogens. Its other main functions are insulation and temperature regulation, sensation and vitamin D and B synthesis. Skin is considered one of the most important parts of the body.

Skin has pigmentation, provided by melanocytes, which absorbs some of the potentially dangerous radiation in sunlight. It also contains DNA repair enzymes which reverse UV damage, and people who lack the genes for these enzymes suffer high rates of skin cancer. One form predominantly produced by UV light, malignant melanoma, is particularly invasive, causing it to spread quickly, and can often be deadly. Human skin pigmentation varies among populations in a striking manner. This has sometimes led to the classification of peoples on the basis of skin color.

Law (from the late Old English lagu of probable North Germanic origin) in politics and jurisprudence, is a set of rules or norms of conduct which mandate, forbid or permit specified relationships among people and organizations, intended to provide methods for ensuring the impartial treatment of such people, and provide punishments of/for those who do not follow the established rules of conduct.

Law is typically administered through a system of courts in which judges (sometimes with the aid of a jury or lay magistrate) hear disputes between parties, and apply a set of rules in order to provide an outcome that is just and fair. The substantive and procedural laws, and the manner in which laws are administered, are collectively known as a legal system, which typically has developed through tradition in each country.

Most countries rely upon the police to enforce the law. Police officers most often, must be professionally trained in law enforcement before they are permitted to act under the color of law, to issue legal warnings and citations, execute search or other legal warrants and to make arrests.

The civil law system is a codified law that sets out a comprehensive system of rules that are applied and interpreted by judges. It is by and large the most commonly practiced system of law in the world, with almost 60% of the world's population living in a country ruled on the civil law system.

The most important difference to common law is that normally, only legislative enactments are considered to be legally binding, but not precedent cases, unless a similar matter has been decided upon by a superior court. However, as a practical matter, courts normally follow their previous decisions. Furthermore, in some civil law systems (e.g. in Germany), the writings of legal scholars have considerable influence on the courts.

The common law is an Anglo-Saxon legal tradition, based on judicial decisions that create binding precedent. The common law system is currently in practice in Ireland, United Kingdom, Australia, New Zealand, South Africa, Canada (excluding Quebec), and the United States (although Louisiana uses both common law and Napoleonic civil law). In addition to these countries, several others have adapted the common law system into a mixed system. For example, Pakistan, India and Nigeria operate largely on a common law system, but incorporate a good deal of customary law and religious law.

Customary law are systems of law that have evolved largely on their own within a given country and have been adapted to meet the needs of the particular culture. Note that customary law may also be relevant within jurisdictions following another legal tradition in fields or subfields of law where no legislative enactment exists. For example, in Austria, scholars of private law often claim that customary law continues to exist, whereas public law scholars dispute this claim.