But there are more social bookmarking websites too. We made this video for you, you can learn what s The top ten social bookmarking sites in the world in 2011.

We know best social networking sites, they are: facebook, linkedin, myspace and orkut(especially in latin america countries). Facebook has got 600 millions visitors per a month so it’s the leader!. But there are other web sites too.

You can watch a video about top social networking websites in 2011 years;

Petra was founded by Nabatean tribe in nine eighteenth dynasty of Egypt by the King Aretas IV as the city that are difficult to be attacked by enemy and secure from natural disasters such as sandstorms. Petra was the capital of the kingdom, which was built with an elaborate irrigation system and a theater that holds 4000 people.

The site remained unknown to the Western world until 1812, when it was introduced by the Swiss explorer Johann Ludwig Burckhardt. It was described as “a rose-red city half as old as time” in a Newdigate prize-winning sonnet by John William Burgon. UNESCO has described it as “one of the most precious cultural properties of man’s cultural heritage.

Now, this place is opened for tourist. In 2006 the design of a Visitor Centre began. The Jordan Times reported in December 2006 That 59.000 people visited in the two months October and November 2006, 25% fewer than the Same Period in the previous year.

It is now fully accepted that the neutrino is a tiny particle with no charge and with very low mass. Neutrinos are released in nuclear fusion processes, as they proceed in stars in supernova explosions, or in the particle accelerators of particle physicists. Neutrinos have little interaction with other matter. Every second, billions of neutrinos fly through our bodies without us noticing something like this. The neutrino is a “nothing”. But still ..

Detect neutrinos is due to the low interaction with other matter very difficult. Raymond Davis has discussed for 40 years, with the possible techniques of their evidence and, despite great skepticism of his colleagues, continued the search. The first evidence came in the 50s in a reactor (Brookhaven’s Graphite Research Kernreactor). Later, the detection of released in the solar neutrinos in a detector was in the “Homestake mine in South Dakota (USA), and so have the stamina and inventiveness of Davis rewarded.
In Japan, it was Masatoshi Koshiba, who established there neutrino detectors. He and his group have contributed significantly to the knowledge on neutrinos. Find out more is reported below.

X-ray radiation (X-Ray) is electromagnetic radiation of high energy. X-ray photons are efficiently absorbed by matter, so that they have of a free path through the atmosphere just a few meters. As an astrophysicist showed that release also star X-ray photons, I wanted to prove it. These detectors must be placed above the Earth’s atmosphere, of course. Ricardo Giacconi has a very early stage devoted to the development of technology and the measurement of the X-ray radiation from the universe.

Giacconi and staff discovered so in 1962 with a rocket experiment, the first X-ray point source in the sky in the constellation Scorpio: Sco X-1. With further developed by Giacconi rockets and satellites (eg, “UHURU satellite” [1970], “Einstein satellite ‘[1978]) succeeded in many X-ray point sources, but to discover and diffuse X-ray radiation.

For the stellar evolution in both research fields of astrophysics, the neutrino research and the X-ray astronomy are equally important.

The Serengeti hosts the largest migration in the world, which is one of the ten natural travel wonders of the world. The region contains several national parks and game reserves. Serengeti is derived from the Maasai language, Maa; specifically, “Serengit” meaning “Endless Plains”. Approximately 70 larger mammal and some 500 avifauna species are found there. This high diversity in terms of species is a function of diverse habitats ranging from riverine forests, swamps, kopjes, grasslands and woodlands. Blue Wildebeests, gazelles, zebras and buffalos are some of the commonly found large mammals in the region.Currently there is controversy surrounding a proposed road that is to be built through the Serengeti in Tanzania.

Great Migration

Around October, nearly two million herbivores travel from the northern hills toward the southern plains, crossing the Mara River, in pursuit of the rains. In April, they then return to the north through the west, once again crossing the Mara River. This phenomenon is sometimes called the Circular Migration. Some 250,000 wildebeest die during the journey from Tanzania to Masai Mara Reserve in lower Kenya, a total of 800 kilometres (500 mi). Death is usually from thirst, hunger, exhaustion, or predation. The migration is chronicled in the 1994 documentary film, Africa: The Serengeti. In January 2007 there were great herds of White eared Kob that now rivals with the Kobs migration.

The third and currently the largest geothermal plant, which also generates electricity, was inaugurated in 2009 in Unterhaching, near Munich. In the years before the plant had already been fed into the local district heating network, came to these 31 megawatts of heat now 3.4 megawatts of electricity.

The first German geothermal power plant is working since 2003 with an electrical output of 250 kilowatts in Neustadt-Glewe in Mecklenburg-Western Pomerania, Rhineland-Palatinate in 2007 was a three-Landau-megawatt plant.

As the Federal Ministry of Environment finds that the market been slower than expected, partly because of the high initial costs and risks of deep drilling. Currently there are more projects to generate electricity and heat in the building. The intended goal: By 2020, the vervierzigfachen the current performance of deep geothermal plants at 280 megawatts. 1.8 billion kilowatt hours of electricity will be produced and 8.2 billion kilowatt hours of heat.

The three existing plants tap into aquifers at great depths, so-called aquifers. Through more than two miles deep hole is around 130 degrees in Unterhaching promoted hot salt water and after the electricity and heat production cooled through a second well is pumped back into the depths – hydrothermal geothermal. The technological challenge: to convert the heat taken off in a steam turbine into electricity, are the temperatures of the deep water in Germany – even in low places – in fact too low. Therefore one uses in Neustadt-Glewe and Landau, an organic liquid with low boiling point below 100 degrees Celsius to drive the steam turbine.

The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (1.83 km) (6000 feet). Nearly two billion years of the Earth’s geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While the specific geologic processes and timing that formed the Grand Canyon are the subject of debate by geologists,recent evidence suggests the Colorado River established its course through the canyon at least 17 million years ago. Since that time, the Colorado River continued to erode and form the canyon to the point we see it at today.

Before European immigration, the area was inhabited by Native Americans who built settlements within the canyon and its many caves. The Pueblo people considered the Grand Canyon (“Ongtupqa” in Hopi language) a holy site and made pilgrimages to it. The first European known to have viewed the Grand Canyon was García López de Cárdenas from Spain, who arrived in 1540.

Some of the greatest mathematical minds of all ages, from Pythagoras and Euclid in ancient Greece, through the medieval Italian mathematician Leonardo of Pisa and the Renaissance astronomer Johannes Kepler, to present-day scientific figures such as Oxford physicist Roger Penrose, have spent endless hours over this simple ratio and its properties. But the fascination with the Golden Ratio is not confined just to
mathematicians. Biologists, artists, musicians, historians, architects, psychologists, and even mystics have pondered and debated the basis of its ubiquity and appeal. In fact, it is probably fair to say that the Golden Ratio has inspired thinkers of all disciplines like no other number in the history of mathematics.

Ancient Greek mathematicians first studied what we now call the golden ratio because of its frequent appearance in geometry. The division of a line into “extreme and mean ratio” (the golden section) is important in the geometry of regular pentagrams and pentagons. The Greeks usually attributed discovery of this concept to Pythagoras or his followers. The regular pentagram, which has a regular pentagon inscribed within it, was the Pythagoreans’ symbol.

Euclid’s Elements (Greek: Στοιχεῖα) provides the first known written definition of what is now called the golden ratio: “A straight line is said to have been cut in extreme and mean ratio when, as the whole line is to the greater segment, so is the greater to the less.”Euclid explains a construction for cutting (sectioning) a line “in extreme and mean ratio”, i.e. the golden ratio. Throughout the Elements, several propositions (theorems in modern terminology) and their proofs employ the golden ratio. Some of these propositions show that the golden ratio is an irrational number.n The name “extreme and mean ratio” was the principal term used from the 3rd century BC until about the 18th century. The modern history of the golden ratio starts with Luca Pacioli’s De divina proportione of 1509, which captured the imagination of artists, architects, scientists, and mystics with the properties, mathematical and otherwise, of the golden ratio.

Michael Maestlin, first to publish a decimal approximation of the golden ratio, in 1597. The first known approximation of the (inverse) golden ratio by a decimal fraction, stated as “about 0.6180340,” was written in 1597 by Prof. Michael Maestlin of the University of Tübingen in a letter to his former student Johannes Kepler. Since the twentieth century, the golden ratio has been represented by the Greek letter Φ or φ (phi, after Phidias, a sculptor who is said to have employed it) or less commonly by τ (tau, the first letter of the ancient Greek root τομή—meaning cut). … VMDHBSWVQF5T

The Sphinx was carved over 4,500 years ago. It was for the Pharaoh Khafre. It had his head, the body of a lion. The Sphinx was carved out of a huge big stone. It is guarding Khafre’s pyramid. The Sphinx was covered by sand which preserved it all these years. Its body is extremely soft rock and its head is very strong rock but some people used the head for gunshot practice. No one knows for sure what it was decorated with in the days of the Ancient Egyptians but it must have been very beautiful then.

In 1983, the Taj Mahal became a UNESCO World Heritage Site. While the white domed marble mausoleum is the most familiar component of the Taj Mahal, it is actually an integrated complex of structures. The construction began around 1632 and was completed around 1653, employing thousands of artisans and craftsmen. The construction of the Taj Mahal was entrusted to a board of architects under imperial supervision, including Abd ul-Karim Ma’mur Khan, Makramat Khan, and Ustad Ahmad Lahauri. Lahauri is generally considered to be the principal designer.

In 1631, Shah Jahan, emperor during the Mughal empire’s period of greatest prosperity, was grief-stricken when his third wife, Mumtaz Mahal, died during the birth of their fourteenth child, Gauhara Begum. Construction of the Taj Mahal began in 1632, one year after her death. The court chronicles of Shah Jahan’s grief illustrate the love story traditionally held as an inspiration for Taj Mahal. The principal mausoleum was completed in 1648 and the surrounding buildings and garden were finished five years later.