Graffiti

Graffiti (singular: graffito; the plural is used as a mass noun) is the name for images or lettering scratched, scrawled, painted or marked in any manner on property. Graffiti is sometimes regarded as a form of art and other times regarded as unsightly damage or unwanted. Some people think of it as art, others vandalism, and others, a culture of its own.

Graffiti has existed since ancient times, with examples going back to Ancient Greece and the Roman Empire. Graffiti can be anything from simple scratch marks to elaborate wall paintings. In modern times, spray paint and markers have become the most commonly used materials. In most countries, defacing property with graffiti without the property owner's consent is considered vandalism, which is punishable by law. Sometimes graffiti is employed to communicate social and political messages. To some, it is an art form worthy of display in galleries and exhibitions, to others it is merely vandalism. There are many different types and styles of graffiti and it is a rapidly evolving artform whose value is highly contested, being reviled by many authorities while also subject to protection, sometimes within the same jurisdiction.

ASCII art

ASCII art is an artistic medium that relies primarily on computers for presentation and consists of pictures pieced together from the 95 printable (from a total of 128) characters defined by the ASCII Standard from 1963 and ASCII compliant character sets with proprietary extended characters (beyond the 128 characters of standard 7-bit ASCII). The term is also loosely used to refer to text based art in general. ASCII art can be created with any text editor, and is often used with free-form languages. Most examples of ASCII art require a fixed-width font (non-proportional fonts, like on a traditional typewriter) such as Courier for presentation.

Among the oldest known examples of ASCII art are the creations by computer-art pioneer Kenneth Knowlton from around 1966, who was working for Bell Labs at the time. "Studies in Perception I" by Ken Knowlton and Leon Harmon from 1966 shows some examples of their early ASCII art.

One of the main reasons ASCII art was born was because early printers often lacked graphics ability and thus characters were used in place of graphic marks. Also, to mark divisions between different print jobs from different users, bulk printers often used ASCII art to print large banners, making the division easier to spot so that the results could be more easily separated by a computer operator or clerk.

History of Cigarette

The earliest forms of cigarettes have been attested in Central America around the 9th century in the form of reeds and smoking tubes. The Maya, and later the Aztecs, smoked tobacco and various psychoactive drugs in religious rituals and frequently depicted priests and deities smoking on pottery and temple engravings. The cigarette, and the cigar, were the most common method of smoking in the Caribbean, Mexico and Central and South America until recent times.

Cigarettes were largely unknown in the English-speaking world before the Crimean War, when British soldiers began emulating their Ottoman Turkish comrades, who resorted to rolling their tobacco with newsprint.

The cigarette was named some time in the 18th century: beggars in Seville began to pick from the ground the cigar ends left by the señoritos ("rich, young men"), wrapped the tobacco remains with paper and smoked them. The first attested use in this habit can be seen in three 18th-century paintings by Francisco de Goya: La cometa (The Kite), La merienda en el Manzanares (Picnic by the River Manzanares) and El juego de la pelota a pala (The Ball and Paddle Game).

In the George Bizet opera Carmen, which was set in Spain in the 1830s, the title character Carmen was at first a worker in a cigarette factory.

The use of tobacco in cigarette form became increasingly popular during and after the Crimean War. This was helped by the development of tobaccos that are suitable for cigarette use. During World War I and World War II, cigarettes were rationed to soldiers. During the second half of the 20th century, the adverse health effects of cigarettes started to become widely known and text-only health warnings became commonplace on cigarette packets. The United States and The United Kingdom have not yet implemented graphical cigarette warning labels, which is considered a more effective method to communicate to the public the dangers of cigarette smoking. Canada, Australia, and New Zealand, however, have both textual warnings and graphic visual images displaying, among other things, the damaging effects tobacco use has on the human body.

The cigarette has evolved much since its conception; for example, the thin bands that travel transverse to the "axis of smoking" (thus forming circles along the length of the cigarette) are alternate sections of thin and thick paper to facilitate effective burning when being drawn, and retard burning when at rest. Synthetic particulate filters remove some of the tar before it reaches the smoker.

Milk

Milk is an opaque white liquid produced by the mammary glands of female mammals (including monotremes). It provides the primary source of nutrition for newborn mammals before they are able to digest other types of food. The early lactation milk is known as colostrum, and carries the mother's antibodies to the baby. It can reduce the risk of many diseases in the baby. The exact components of raw milk varies by species, but it contains significant amounts of saturated fat, protein and calcium as well as vitamin C.

Origin and inspiration of Taj Mahal

In 1631, Shah Jahan, emperor during the Mughal empire's period of greatest prosperity, was griefstricken when his third wife, Mumtaz Mahal, died during the birth of their fourteenth child, Gauhara Begum. The court chronicles of Shah Jahan's grief illustrates the love story traditionally held as an inspiration for Taj Mahal. The construction of Taj Mahal begun soon after Mumtaz's death with the principal mausoleum completed in 1648. The surrounding buildings and garden were finished five years later.Empror Shah Jahan himself described the Taj in these words:

"Should guilty seek asylum here, Like one pardoned, he becomes free from sin. Should a sinner make his way to this mansion, All his past sins are to be washed away. The sight of this mansion creates sorrowing sighs; And the sun and the moon shed tears from their eyes. In this world this edifice has been made; To display thereby the creator's glory".

The Taj Mahal incorporates and expands on design traditions of Persian and earlier Mughal architecture. Specific inspiration came from successful Timurid and Mughal buildings including the Gur-e Amir (the tomb of Timur, progenitor of the Mughal dynasty, in Samarkand), Humayun's Tomb, Itmad-Ud-Daulah's Tomb (sometimes called the Baby Taj), and Shah Jahan's own Jama Masjid in Delhi. While earlier Mughal buildings were primarily constructed of red sandstone, Shah Jahan promoted the use of white marble inlaid with semi-precious stones, and buildings under his patronage reached new levels of refinement.

Borobudur

Borobudur is a ninth-century Mahayana Buddhist monument in Magelang, Central Java, Indonesia. The monument comprises six square platforms topped by three circular platforms, and is decorated with 2,672 relief panels and 504 Buddha statues. A main dome, located at the center of the top platform, is surrounded by 72 Buddha statues seated inside perforated stupa.

The monument is both a shrine to the Lord Buddha and a place for Buddhist pilgrimage. The journey for pilgrims begins at the base of the monument and follows a path circumambulating the monument while ascending to the top through the three levels of Buddhist cosmology, namely Kamadhatu (the world of desire), Rupadhatu (the world of forms) and Arupadhatu (the world of formlessness). During the journey the monument guides the pilgrims through a system of stairways and corridors with 1,460 narrative relief panels on the wall and the balustrades.

Evidence suggests Borobudur was abandoned following the fourteenth century decline of Buddhist and Hindu kingdoms in Java, and the Javanese conversion to Islam. Worldwide knowledge of its existence was sparked in 1814 by Sir Thomas Raffles, the then British ruler of Java, who was advised of its location by native Indonesians. Borobudur has since been preserved through several restorations. The largest restoration project was undertaken between 1975 and 1982 by the Indonesian government and UNESCO, following which the monument was listed as a UNESCO World Heritage Site. Borobudur is still used for pilgrimage; once a year Buddhists in Indonesia celebrate Vesak at the monument, and Borobudur is Indonesia's single most visited tourist attraction.

Neil Armstrong

Neil Armstrong, born in 1930, one of the first civilian United States astronauts and the first human to set foot on the moon. Armstrong was the commander of the first Apollo program mission to land on the moon—Apollo 11—in July 1969. He also flew aboard a Gemini program mission in 1966 and has been a U.S. Navy combat pilot, test pilot, professor, businessman, and presidential adviser. He received the Presidential Medal of Freedom and numerous international awards for his service on Apollo 11.

Armstrong was born in Wapakoneta, Ohio. When he was 16 years old he began flying as a student pilot. He earned a navy scholarship and began attending Purdue University in 1947. In 1950 Armstrong began active duty with the navy for the Korean War. He flew fighter planes in Korea until 1952, when he returned to Purdue. Armstrong earned his B.S. degree in aeronautical engineering in 1955.

Armstrong joined the National Advisory Committee for Aeronautics (NACA) at the Lewis Research Center in Cleveland, Ohio, in 1955, then transferred later that same year to the NACA Flight Research Center at Edwards Air Force Base in California. He was a test pilot for many of the high-performance aircraft used to experiment with ideas for spacecraft. Armstrong left the Flight Research Center in 1962 to join the second group of U.S. National Aeronautics and Space Administration (NASA) astronaut trainees.

This second group of trainees included the first two civilian astronaut candidates, Armstrong and test pilot Elliot See. (See unfortunately died in a plane crash while training to be commander of Gemini 9.) After completing initial training at NASA, Armstrong served as a backup to the Gemini 5 crew, then became the command pilot of Gemini 8; David R. Scott also flew aboard Gemini 8. The mission launched March 16, 1966, with the primary objective of docking with another spacecraft. Gemini 8 rendezvoused with a used segment of a launch vehicle called an Agena booster 298 km (185 mi) above the earth, and Armstrong successfully docked the two craft together 6 hours and 34 minutes into the mission. Roughly 30 minutes later, the paired spacecraft began to rotate unexpectedly and without any command from the astronauts. The rotation eventually reached about 60 revolutions per minute. The astronauts and the ground crew reacted rapidly and diagnosed a short circuit in the thruster rocket that controlled Gemini 8’s orientation. Armstrong and Scott had to use roughly 75 percent of Gemini 8's fuel to stabilize the craft, forcing the mission to end early with an emergency reentry during the seventh orbit.

Mars Rover Leaves Crater for Martian Plains

After nearly a year rolling around inside an expansive crater on Mars, NASA's trusty rover Opportunity is headed back out to explore the Martian plains.

"The rover is back on flat ground," said Paolo Belluta, engineer and rover driver at NASA's Jet Propulsion Laboratory in Pasadena, Calif.

The golf cart-sized Opportunity climbed up and out of half-mile (800-meter) wide Victoria Crater on Mars late Thursday with one last 22-foot (6.8-meter) push that sent it charging over the top of the crater's rim and through a sand ripple on the other side. The maneuver brought to an end Opportunity's studies of Victoria, which began in September 2007 when the rover made its first foray into the crater.

"We're headed to the next adventure out on the plains of Meridiani," said John Callas, NASA's rover project manager for Opportunity and its robotic twin Spirit on the other side of Mars. "We safely got into the crater, we completed our exploration there and we safely got out."

Opportunity and Spirit have been exploring different parts of Mars since they landed in January 2004. Since then, the rovers have found evidence that water once soaked the Martian terrain in the ancient past among their other discoveries.

But Victoria Crater, a deep depression blasted into the Martian surface with exposed bedrock that serves as a window into planet's geological history, has dominated Opportunity's attention. The rover spent more than half of the four years since it landed on Mars studying the giant crater.

Opportunity first headed for Victoria in late 2004 after visiting a smaller, stadium-sized crater, dubbed Endurance, earlier that year. The rover took 22 months to cross the few miles between Endurance and Victoria, and managed to escape a deep sand dune that held it fast for five weeks before engineers were able to work it back out.

After arriving at Victoria, Opportunity spent a year meticulously circling partway around the crater's rim to find the best spot to drive into its interior. The rover spent so long at Victoria that NASA's Mars Reconnaissance Orbiter circling the red planet managed to catch its path around the massive crater.

Opportunity's handlers decided last month to order the rover to leave Victoria Crater after spotting a power spike in the automaton's left front wheel. The rover steadfastly backtracked along its entry path to get back out, mission managers said.

"We were concerned that any wheel failure on our aging rover could have left us trapped inside the crater," Callas said.

A similar spike preceded the full-blown failure of wheel on the Spirit rover in 2006. Spirit is currently building a full-color panorama photograph as it awaits better sunlight conditions for is solar panels at its "Home Plate" location on Mars, mission managers said.

A third NASA spacecraft, the Phoenix Mars Lander, also hit a milestone this week. The stationary probe surpassed its initial 90-day mission earlier this week and began extended operations while digging for buried Martian ice in the planet's arctic circle.

Since landing, Opportunity has spent 1,635 days exploring Mars and traversed more than 7 miles (11 km) of Martian terrain during its mission.

The rover is now poised to begin hunting new targets: chunks of Mars rocks called cobbles that lie strewn across the red planet's surface. Researchers believe the cobbles, which are about the size of a human fist and larger, are chunks of material ejected from impacts that caused craters that are too far away from Opportunity to be fully explored.

"Our experience tells us there's lots of diversity among the cobbles," said rover mission planner Scott McLennan of the State University of New York, Stony Brook. "We want to get a better characterization of them. A statistical sampling from examining more of them will be important for understanding the geology of the area."

Origin and fossil record

Animals are generally considered to have evolved from a flagellated eukaryote. Their closest known living relatives are the choanoflagellates, collared flagellates that have a morphology similar to the choanocytes of certain sponges. Molecular studies place animals in a supergroup called the opisthokonts, which also include the choanoflagellates, fungi and a few small parasitic protists. The name comes from the posterior location of the flagellum in motile cells, such as most animal spermatozoa, whereas other eukaryotes tend to have anterior flagella.

The first fossils that might represent animals appear towards the end of the Precambrian, around 610 million years ago, and are known as the Ediacaran or Vendian biota. These are difficult to relate to later fossils, however. Some may represent precursors of modern phyla, but they may be separate groups, and it is possible they are not really animals at all. Aside from them, most known animal phyla make a more or less simultaneous appearance during the Cambrian period, about 542 million years ago. It is still disputed whether this event, called the Cambrian explosion, represents a rapid divergence between different groups or a change in conditions that made fossilization possible. However some paleontologists and geologists would suggest that animals appeared much earlier than previously thought, possibly even as early as 1 billion years ago. Trace fossils such as tracks and burrows found in Tonian era strata in India indicate the presence of triploblastic worm like metazoans roughly as large (about 5 mm wide) and complex as earthworms.In addition during the beginning of the Tonian period around 1 billion years ago (roughly the same time that the trace fossils previously discussed in this article date back to) there was a decrease in Stromatolite diversity which may indicate the appearance of grazing animals during this time as Stromatolites also increased in diversity shortly after the end-Ordovician and end-Permian rendered large amounts of grazing marine animals extinct and decreased shortly after their populations recovered. However some other scientists doubt that these fossils are authentic and have suggested these trace fossils are just the result of natural processes such as erosion.

Reproduction and development

Nearly all animals undergo some form of sexual reproduction. Adults are diploid or polyploid. They have a few specialized reproductive cells, which undergo meiosis to produce smaller motile spermatozoa or larger non-motile ova. These fuse to form zygotes, which develop into new individuals.

A newt lung cell stained with fluorescent dyes undergoing mitosis, specifically early anaphase.

Many animals are also capable of asexual reproduction. This may take place through parthenogenesis, where fertile eggs are produced without mating, or in some cases through fragmentation.

A zygote initially develops into a hollow sphere, called a blastula, which undergoes rearrangement and differentiation. In sponges, blastula larvae swim to a new location and develop into a new sponge. In most other groups, the blastula undergoes more complicated rearrangement. It first invaginates to form a gastrula with a digestive chamber, and two separate germ layers - an external ectoderm and an internal endoderm. In most cases, a mesoderm also develops between them. These germ layers then differentiate to form tissues and organs.

Most animals grow by indirectly using the energy of sunlight. Plants use this energy to convert sunlight into simple sugars using a process known as photosynthesis. Starting with the molecules carbon dioxide (CO2) and water (H2O), photosynthesis converts the energy of sunlight into chemical energy stored in the bonds of glucose (C6H12O6) and releases oxygen (O2). These sugars are then used as the building blocks which allow the plant to grow. When animals eat these plants (or eat other animals which have eaten plants), the sugars produced by the plant are used by the animal. They are either used directly to help the animal grow, or broken down, releasing stored solar energy, and giving the animal the energy required for motion. This process is known as glycolysis.

Animals who live close to hydrothermal vents and cold seeps on the ocean floor are not dependent on the energy of sunlight. Instead, chemosynthetic archaea and eubacteria form the base of the food chain.

De Javu

Also called paramnesia, The term was coined by a French psychic researcher, Émile Boirac (1851–1917) in his book L'Avenir des sciences psychiques (The Future of Psychic Sciences), which expanded upon an essay he wrote while an undergraduate. The experience of déjà vu is usually accompanied by a compelling sense of familiarity, and also a sense of "eeriness", "strangeness", or "weirdness". The "previous" experience is most frequently attributed to a dream, although in some cases there is a firm sense that the experience "genuinely happened" in the past.

The experience of déjà vu seems to be quite common among adults and children alike; in formal studies 70% of people report having experienced it at least once. References to the experience of déjà vu are also found in literature of the past, indicating it is not a new phenomenon. It has been extremely difficult to evoke the déjà vu experience in laboratory settings, therefore making it a subject of few empirical studies. Recently, researchers have found ways to recreate this sensation using hypnosis.

In the English speaking world the "vu" in "déjà vu" is often mispronounced as "vous" ("voo") instead of "vu" ("vu"). Persons who pronounce "déja vu" as "vous" actually say "already you" instead of "already seen" if this would be translated. This pronunciation mistake can be heard in many English language films and tv series, as in, for example, the film Groundhog Day and the 16th episode of Monty Python's Flying Circus.

Dream

In 1976, J. Allan Hobson and Robert McCarley proposed a new theory that changed dream research, challenging the previously held Freudian view of dreams as unconscious wishes to be interpreted. The activation synthesis theory asserts that the sensory experiences are fabricated by the cortex as a means of interpreting chaotic signals from the pons. They propose that in REM sleep, the ascending cholinergic PGO (ponto-geniculo-occipital) waves stimulate higher midbrain and forebrain cortical structures, producing rapid eye movements. The activated forebrain then synthesizes the dream out of this internally generated information. They assume that the same structures that induce REM sleep also generate sensory information.

Hobson and McCarly's 1976 research suggested that the signals interpreted as dreams originated in the brain stem during REM sleep. However, research by Mark Solms suggests that dreams are generated in the forebrain, and that REM sleep and dreaming are not directly related. While working in the neurosurgery department at hospitals in Johannesburg and London, Solms had access to patients with various brain injuries. He began to question patients about their dreams and confirmed that patients with damage to the parietal lobe stopped dreaming; this finding was in line with Hobson's 1977 theory. However, Solms did not encounter cases of loss of dreaming with patients having brain stem damage. This observation forced him to question Hobson's prevailing theory which marked the brain stem as the source of the signals interpreted as dreams. Solms viewed the idea of dreaming as a function of many complex brain structures as validating Freudian dream theory, an idea that drew criticism from Hobson.Unhappy about Holmes' attempts at discrediting him, Solms, along with partner Edward Nadar, undertook a series of traumatic-injury impact studies using several different species of primates, particularly howler monkeys, in order to more fully understand the role brain damage plays in dream pathology. Solms' experiments proved inconclusive, however, as the high mortality rate associated with using an hydraulic impact pin to artificially produce brain damage in test subjects meant that his final candidate pool was too small to satisfy the requirements of the scientific method.

Earth

Earth (or, "the earth") is the only planet known to support life, and as such, its natural features are the subject of many fields of scientific research. Within the solar system, it is third nearest to the sun; it is the largest terrestrial planet and the fifth largest overall. Its most prominent climatic features are its two large polar regions, two relatively narrow temperate zones, and a wide equatorial tropical to subtropical region.Precipitation varies widely with location, from several metres of water per year to less than a millimetre. About 70 percent of the surface is covered by salt-water oceans. The remainder consists of continents and islands, with most of the inhabited land in the Northern Hemisphere.

Earth has evolved through geological and biological processes that have left traces of the original conditions. The outer surface is divided into several gradually migrating tectonic plates, which have changed relatively quickly several times. The interior remains active, with a thick layer of molten mantle and an iron-filled core that generates a magnetic field.

The atmospheric conditions have been significantly altered from the original conditions by the presence of lifeforms, which create an ecological balance that stabilizes the surface conditions. Despite the wide regional variations in climate by latitude and other geographic factors, the long-term average global climate is quite stable during interglacial periods,[13] and variations of a degree or two of average global temperature have historically had major effects on the ecological balance, and on the actual geography of the Earth.

Groups of animals

The sponges (Porifera) were long thought to have diverged from other animals early. As mentioned above, they lack the complex organization found in most other phyla. Their cells are differentiated, but in most cases not organized into distinct tissues. Sponges are sessile and typically feed by drawing in water through pores. Archaeocyatha, which have fused skeletons, may represent sponges or a separate phylum. However, a phylogenomic study in 2008 of 150 genes in 21 genera revealed that it is the Ctenophora or comb jellies which are the basal lineage of animals, at least among those 21 phyla. The authors speculate that sponges—or at least those lines of sponges they investigated—are not so primitive, but may instead be secondarily simplified.

Among the other phyla, the Ctenophora and the Cnidaria, which includes sea anemones, corals, and jellyfish, are radially symmetric and have digestive chambers with a single opening, which serves as both the mouth and the anus. Both have distinct tissues, but they are not organized into organs. There are only two main germ layers, the ectoderm and endoderm, with only scattered cells between them. As such, these animals are sometimes called diploblastic. The tiny Placozoans are similar, but they do not have a permanent digestive chamber.

The remaining animals form a monophyletic group called the Bilateria. For the most part, they are bilaterally symmetric, and often have a specialized head with feeding and sensory organs. The body is triploblastic, i.e. all three germ layers are well-developed, and tissues form distinct organs. The digestive chamber has two openings, a mouth and an anus, and there is also an internal body cavity called a coelom or pseudocoelom. There are exceptions to each of these characteristics, however - for instance adult echinoderms are radially symmetric, and certain parasitic worms have extremely simplified body structures.

Genetic studies have considerably changed our understanding of the relationships within the Bilateria. Most appear to belong to two major lineages: the Deuterostomes and Protostomes, which includes the Ecdysozoa, Platyzoa, and Lophotrochozoa. In addition, there are a few small groups of bilaterians with relatively similar structure that appear to have diverged before these major groups. These include the Acoelomorpha, Rhombozoa, and Orthonectida. The Myxozoa, single-celled parasites that were originally considered Protozoa, are now believed to have developed from the Bilateria as well.

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Charles Darwin

When the theory of evolution was first publicly presented — exactly 150 years ago today — it wasn't immediately recognized as a revolutionary scientific breakthrough. Rather, the course of its impact was more, well, evolutionary.

And even though we generally think the idea of natural selection was devised by Charles Darwin, it turns out that he wasn't the concept's sole originator. Another Victorian naturalist, Alfred Russel Wallace, came up with the idea after years of living in the Far East, studying and collecting animal and plant specimens.

Wallace actually came up with the idea twenty years earlier, says David Quammen, author of the book The Reluctant Mr. Darwin. Wallace delayed publishing anything about his theory because in addition to wanting to amass all the evidence he could in defense of it, Quammen says, "he was a little bit wary of how this drastic radical idea would be received."

Wallace was also an outsider, with none of Darwin's wealth or social standing, says Quammen, who is currently writing an article about Wallace for National Geographic. Wallace left school at age 14, and had to support himself by selling insect specimens to museums and collectors. Wallace knew Darwin from a distance, says Quammen, as an eminent and conventional naturalist, who wrote what was, in essence, a best selling travel book, The Voyage of the Beagle.

But what Wallace did not know, says Quammen, was that Darwin was working on his theory of natural selection. Darwin told only a very few of his closest friends. When the young Wallace sent Darwin a copy of a paper outlining the theory, Darwin at first went into despair, thinking that Wallace would be the first to claim credit for the idea.

Instead, friends of Darwin's organized a presentation of papers by both men at London's Linnean Society. "It was about 30 people in a hot room," says Quammen. "The people who attended the meeting don't seem to have realized what had just been read to them. It just slipped by how important these papers were."

Darwin then rushed to publish On the Origin of the Species, which, unlike the Linnean Society evening, did make an impression, one that has been reverberating ever since.

It never seemed to bother Wallace that Darwin received all the credit. The two men, says Quammen, became friendly as scientists, though not particularly close personally. He says that Wallace admired Darwin and never felt any bitterness towards him, as far as anyone can tell. He even wrote a book called Darwinism. "That's the extent to which he ceded primary credit to Darwin," says Quammen. "He felt glad to be accepted as a partner, albeit a junior partner, in this great discovery. It seems to be more than he would have hoped for and he was very glad to settle for it."