Aarushhh/wikipedia-simple-splitted huggingface dataset:
Health is "a state of complete physical, mental, and social well-being, and not merely the absence of disease" according to the World Health Organization (WHO). Physical health is about the body. Mental health is about how people think and feel. Social health talks about how people live with other people. It is about family, work, school, and friends.

Aspects of health
Physical fitness refers to good body health. It is dependent on genetic determinators and also on social, economic and ecological factors. That means, one's genes are partly responsible for one's physical health, but also other circumstances: where you live, how clean or polluted your water and the air around you is and also how good your social and medical system is. It is also the result of regular exercise, proper diet and nutrition, and proper rest for physical recovery. A person who is physically fit will be able to walk or run without getting breathless and they will be able to carry out the activities of everyday living and not need help. How much each person can do will depend on their age and whether they are a man or woman. A physically fit person usually has a normal weight for their height. The relation between their height and weight is called their Body Mass Index. A taller person can be heavier and still be fit. If a person is too heavy or too thin for their height it may affect their health
. Better health is central to human happiness and well-being. It also makes an important contribution to economic progress, as healthy populations live longer, are more productive, and save more. Many factors influence health status and a country's ability to provide quality health services for its people.
Mental health
Mental health refers to a person's emotional and psychological well-being. "A state of emotional and psychological well-being in which an individual is able to use his or her thinking and emotional (feeling) abilities, function in society, and meet the ordinary demands of everyday life."

One way to think about mental health is by looking at how well a person functions. Feeling capable and efficient; being able to handle normal levels of stress, have good friends and family, and lead an independent life; and being able to "bounce back," or recover from hardships, are all signs of mental health. It’s normal for all of us to feel worried, sad, upset, or have difficult emotions from time to time. For most people though, these feelings are only temporary and are resolved without causing any long-term problems. However, for some people, these negative feelings can become worse over time and lead to a mental health problem such as depression, anxiety, stress or obsessive-compulsive disorder (OCD).
Public health

Public health refers to trying to stop a disease that is unhealthy to the community, and does not help in living a long life or promote your health. This is fixed by organized efforts and choices of society, public and private clubs, communities and individuals.

It is about the health of many people, or everybody, rather than one person. Public health stops instead of encouraging a disease through surveillance of cases. To prevent being sick, it is good to act according to some simple advice:  Hand washing, regular check-ups,  vaccination programmes, drinking clean water, and using condoms. When infectious diseases break out, washing hands for about 30 seconds may be especially important. Sometimes it is necessary to avoid masses of people or wear a surgical mask to protect yourself and to stop the spreading of the disease. Teaching people how to live healthily and educate them, especially about sex and childbirth, is also very important.
Related pages
 Medicine
 Healthy lifestyle
 Fitness
 Right to health

References

Health
Basic English 850 words
A harbor (American English) or harbour (British English) is a place where ships may shelter. Some harbours are used as ports to load and unload ships. The port will have quays or piers where the ships may be moored or tied up and a transport system for taking goods inland. Often railway and road transport will be used. Goods also move by pipeline transport and by smaller ships on rivers.

Harbor means to shelter or keep safe. Harbors can be natural as in San Francisco or artificial as in ancient Carthage or a mix of both. During the D-Day operations of 1944, two artificial harbors (named mulberry) were built just off the beaches where the invasion was happening.

Related pages  
 Dock
 Dockyard
 Marina
 Naval base
 Quay
 Seaport
 Transport
 Wharf

References 

Basic English 850 words
Hawaii (sometimes spelled "Hawai'i") is a U.S. state and the only U.S. State that is in Oceania. It is the last state that joined the United States, becoming a state on August 21, 1959. It is the only state made only of islands. Hawaii is also the name of the largest island. The capital and largest city of Hawaii is Honolulu on the island named Oahu.

Name
Hawaii is known as the "Aloha State". Aloha is a Hawaiian word that has many meanings like welcome, hello and goodbye. Aloha also means love and care. The different meanings are brought together in the term "Aloha Spirit" to describe the friendly people of Hawaii.

Geography
Hawaii is an archipelago, a long chain of islands. There are eight main islands and many small islands and atolls. They are the tops of underwater volcanos. The main islands are Niihau, Kauai, Oahu, Molokai, Lanai, Kahoolawe, Maui and Hawaii.
History
The first people of Hawaii were Polynesians. They came to the islands sometime between 200 and 600 AD. Captain James Cook discovered the islands in 1778. Others may have been there before him. Captain Cook named the islands the Sandwich Islands for the fourth Earl of Sandwich, John Montague.

Kamehameha I was the first king of Hawaii. He united the separate small Hawaiian kingdoms into one large kingdom in 1795. In 1893, American soldiers stopped Queen Liliuokalani from leading Hawaii when American business people took over the government and made their own laws. She was the last monarch of Hawaii. She also wrote the original words of the song called Aloha Oe.
The Americans made Hawaii into a republic for a short time. The new leader, Sanford Dole was called the President of Hawaii. In 1898, the United States of America took over the government and made Hawaii into a territory.In 1907, University of Hawaiʻi is established.  In 1959, Hawaii became the fiftieth American state. In other words, it was taken ("annexed") against the wishes of its native people. Their queen, Lili’uokalani, wrote that “it had not entered into our hearts to believe that these friends and allies from the United States… would ever go so far as to absolutely overthrow our form of government, seize our nation by the throat, and pass it over to an alien power”.
Reason for statehood 
Early in World War II the U.S. Pacific Fleet was based on the Philippines. Perceiving that this was not safe, the navy moved its base to the Hawaiian islands, namely Oahu (the main island in the chain). It was there that the Japanese attacked Pearl Harbor. That was significant in the later discussions about the future of the islands.

Economy
The biggest industry of Hawaii is tourism. Almost seven million people visited in 2000. Important exports are sugar, pineapple, macadamia nuts, and coffee.

Popular tourist sites include Waikiki Beach, Hawaii Volcanoes National Park, Polynesian Cultural Center, and the USS Arizona Memorial at Pearl Harbor.
State symbols
The state flower is the yellow hibiscus (Hibiscus brackenridgei or ). The state bird is the Hawaiian goose (nene). The state fish is the reef triggerfish, also called the . The state tree is the candlenut, also called kukui. The state song is Hawaii Ponoi. The state motto is . In English it says, The life of the land is perpetuated in righteousness.

References

Notes

Other websites

 
1959 establishments in the United States
Honolulu is the capital city of the U.S. state of Hawaii. It is also the largest city in Hawaii and it has the most important harbor. It is on the south-east shore of the island of Oahu.

Etymology
Honolulu means "sheltered harbor" in the Hawaiian language. No one knows for sure when Honolulu was first settled or when the name was first used.

History
Honolulu harbor was called Kulolia before foreigners came. The first foreigner was Captain William Brown of the English ship Butterworth, in 1794. He named the harbor Fair Haven. Other foreign captains is started calling it Brown's Harbor. The name Honolulu was used some time after that.

Honolulu quickly became the most important harbor of Hawaii. At that time, sandalwood was a big export. Honolulu was also an important supply point for whalers.

Kamehameha III made Honolulu the capital city of the Kingdom of Hawaii in 1850. It was also the capital of the Republic of Hawaii and the Territory of Hawaii. It stayed the capital when Hawaii became a state in 1959.
Notable people
Ferdinand Marcos, President of the Philippines from 1965 to 1986, died in Honolulu
Bruno Mars, singer, was born in Honolulu
Barack Obama, 44th President of the United States, was born in Honolulu
Nicole Scherzinger, singer, was born in Honolulu
Jason Momoa, actor currently lives in Honolulu

References

 
State capitals in the United States
1907 establishments in North America
1900s establishments in Hawaii
County seats in Hawaii
The Island of Hawaiʻi is the largest U.S. Hawaiian Island, and it is the farthest south. It is also called the "Big Island." Its area is 4,038 sq. miles (10,458 km2). The widest part of the island is 93 miles (150 km) across.
The Big Island has more than half (~62%) of the total land area of State of Hawaii. It is part of County of Hawaii.

The island is seven separate shield volcanos that erupted more or less one at a time, one partly covering the other. These are (from oldest to youngest): Kohala (extinct), Mauna Kea (dormant), Hualalai (dormant), Mauna Loa (active), Kulani (extinct, mostly buried), and Kilauea (very active). The volcanos were caused by the Pacific oceanic tectonic plate moving over a hotspot. There lava from the Earth's lower mantle or upper core is close to the surface.
The largest city on the island is Hilo. Hilo has many historic buildings, interesting shops, parks, many performances, festivals and events. It is on the rainy, east side of the island. The city of Kailua-Kona is on the dry, west side of Hawaii, and is popular with tourists.

References

MacDonald, G. A., and A. T. Abbott. 1970. Volcanoes in the Sea. Univ. of Hawaii Press, Honolulu. 441 p.
History and culture of Hilo. (2010). Retrieved from http://www.hiloliving.com/Hilo_Culture.html

Islands of Hawaii
"Hawaiʻi Ponoʻī" (; "Hawai's Sons") is the state song of Hawaii. The words were written by King David Kalakaua, the music by Prof. Henry Berger, the Royal Bandmaster. "Hawai`i Ponoi" was also the anthem of the Kingdom of Hawai`i and the Territory of Hawai`i.

Lyrics

References

Culture of Hawaii
 
Historical anthems
Healing is a process that happens in the body. Through healing, cells are able to repair damaged tissue.
There are two different ways healing can happen:
 The damaged tissue is replaced with tissue of the same kind. This is called regeneration.
 The damaged tissue is replaced with scar tissue. This is called repair

Most healing processes combine both ways of healing.

Other websites
 How wounds heal and tumors form  With this simple Flash demonstration, Harvard professor Donald Ingber explains how wounds heal, why scars form, and how tumors develop. Presented by Children's Hospital Boston.
 Wound Healing 
 Wound Healing and Repair
 Lorenz H.P. and Longaker M.T.  Wounds: Biology, Pathology, and Management .  Stanford University Medical Center.
 Romo T. and McLaughlin L.A. 2003. Wound Healing, Skin.  Emedicine.com.
 Rosenberg L. and de la Torre J. 2003. Wound Healing, Growth Factors.  Emedicine.com.

Health
Tissues
People have lived in Australia for over 65,000 years. The first people who arrived in Australia were the Aboriginal peoples and Torres Strait Islander people's. They lived in all parts of Australia. They lived by hunting, fishing and gathering.

Aboriginal peoples invented tools like the boomerang and spear. There is also evidence that the Aboriginal people used farming methods.  Tradition was very important in their lives. Their religion is called the Dreamtime, which has lots of stories about the creation of the world by spirits. Aboriginal art started at least 30,000 years ago and there are lots of Dreaming stories painted on walls and cut in rocks all around Australia. Aboriginal music has songs about the Dreamtime, sometimes with special instruments like the didgeridoo.
In 1606 the first European, Dutch explorer Willem Janszoon (1571–1639), visited the west. Luis Vaez de Torres sailed through the water between Australia and New Guinea later that year.
Only after Dirk Hartog chanced upon the west coast in 1616 did other European vessels visit and map the coast. After sixty more ships visited the coast, enough was known for a map to be published in 1811. The land was dry because of not much rain; some was a desert. The explorers thought no crops could be grown and so it would be difficult for people to live there. They decided there would be no economic reasons to stay.
In 1642, Dutchman Abel Tasman, working for the Dutch East Indies Company reached Tasmania, which he called Antony van Diemenslandt. He then called the continent he charted the north coast of on his second visit in 1644 New Holland. In 1688, William Dampier became the first Englishman to reach Australia. But in 1770 a British sailor, Captain James Cook, found the fertile east coast of Australia. He called it New South Wales, and claimed it for Britain.
Englishman Matthew Flinders published his map of the coast in 1814, calling it Australia for the first time, a name later formally adopted by the authorities.

Colonial Australia
Colonial Australia

The British decided to use the land visited by Captain Cook as a prison colony. Britain needed a place to send its convicts (people who had been sent to jail for theft and other crimes) because its gaols were full and it had just lost its American colonies in the American War of Independence. In 1788 the British First Fleet of 11 ships, carrying about 1500 people arrived at Botany Bay (Sydney). Arthur Phillip led them as the first Governor of New South Wales. About 160 000 convicts were brought to Australia from 1788 until 1868. Free immigrants began arriving in the 1790s.

For the first few years they did not have much food, and life was very hard. But soon they began to farm, and more people came. Sydney grew, and new towns were started. Wool brought good money. By 1822, many towns had been set up and people from the towns often visited Sydney for additional economic resources.
Convict transportation ended in the 1840s and 1850s and more changes came. The people in Australia wanted to run their own country, and self-govern. The first governments in the colonies were run by Governors chosen by London. Soon the settlers wanted local government and more democracy. The New South Wales Legislative Council, was created in 1825 to advise the Governor of New South Wales, but it was not chosen by voters. William Wentworth established the Australian Patriotic Association (Australia's first political party) in 1835 to demand democratic government for New South Wales. In 1840, the Adelaide City Council and the Sydney City Council were started and some people could vote for them (but only men with a certain amount of money). Then, Australia's first parliamentary elections were held for the New South Wales Legislative Council in 1843, again with some limits on who could vote
. The Australian Colonies Government Act [1850] allowed constitutions for New South Wales, Victoria, South Australia and Tasmania. In 1850 elections for legislative councils were also held in the colonies of Victoria, South Australia and Tasmania.
In 1855, limited self-government was granted by London to New South Wales, Victoria, South Australia and Tasmania. A new secret ballot was introduced in Victoria, Tasmania and South Australia in 1856, allowing people to vote in private. This system was copied around the world. In 1855, the right to vote was given to all men over 21 in South Australia. The other colonies soon followed. Women were given the vote in the Parliament of South Australia in 1895 and they became the first women in the world allowed to stand in elections. In 1897, Catherine Helen Spence became the first female political candidate.

Australians had started parliamentary democracies all across the continent. But voices were getting louder for all of them to come together as one country with a national parliament.

References

Other websites
Other websites 

 History of the Australian nation – State Library of NSW 
 The Australian History page at Project Gutenberg of Australia
 Bush Poetry a source of Australian History 
 An Aborigine on his understanding of tradition
Spain is a country in Europe.

Early History 
People have lived on the Iberian Peninsula for about 500,000 years. Neanderthal man came about 200,000 years ago. Modern humans first came about 40,000 years. Thousands of years ago Iberians and Celts lived there, and the Phoenicians made a few cities there to get tin and silver to trade.

The Roman Empire controlled Spain for three hundred years; then people from Eastern Europe called Visigoths fought for Spain, won it from the Romans, and controlled Spain for over two hundred years.

Medieval times
The Visigoths converted from Arian Christianity to Roman Catholics. Muslims who were Arab and Berber invaded in 711 and conquered Spain in 718. They called it Al-Andalus. Roman Catholics eventually decided to fight to take Spain back from the Muslims. They fought wars called the reconquista for more than seven hundred years. They also fought Crusades against other Christians like the Cathars. The Moors also fought each other for control of Al-Andalus.
In the year 1492, they took the last part of Spain that had belonged to the Moors. Boabdil, the last Moorish Leader of Granada, gave the city to King Ferdinand of Aragon on 2 January 1492, and Christians now ruled all of Spain.

Before this, several different kings had ruled different countries in what is now called Spain. Two of these countries, Castile and Aragon, came together when the king of Aragon, Ferdinand II, married the queen of Castile, Isabella.

In the same year, 1492, they decided to send Christopher Columbus to explore the Atlantic Ocean. Columbus found a land there that the people of Europe did not yet know. These were the islands of the Caribbean Sea.
Late 15th century 
Columbus and other sailors explored more and found that there were two continents there - North America and South America. Spain sent many soldiers and businessmen to North and South America, and they took over very large parts of those two continents. Owning this empire made Spain very rich. But when they conquered that empire, they killed millions of the Native Americans who had lived there before. Spain owned this empire for more than three hundred years.

Meanwhile, at home, the Muslim manuscripts had been either burnt or spread to other countries. Jews had been expelled from Spain. The multicultural society was destroyed, and so was the learning. Among the few things kept and respected in Spain were in music: harmony and stringed instruments, and of course the buildings, many of which became churches, by adding crosses.
16th and 17th centuries 
The Spanish Empire was the strongest in the world through most of the next two centuries, thanks to gold from the Americas. This new gold made rulers and colonial governors rich. Meanwhile, others' savings became worth less due to inflation. Spain became a society of very rich and very poor. Some of the poorest went to the new colonies in the Caribbean, Central America and South America, mostly to find gold.

Native American peoples were killed by diseases brought by the Spaniards, but most Spaniards did not know this. They found damaged and dying societies with people who had lost some of their most important leaders and thinkers. The Spaniards thought this meant they were inferior, and used this as an excuse to enslave the natives. Millions of natives died mining gold for the Spanish.
The Spanish Empire also at this time funded the Spanish Inquisition which tortured and killed anyone who disagreed with the Roman Catholic Church. The Reformation which created Protestant sects in Europe was not allowed into Spain, it was kept out and, as with Jews or Muslims, its believers were killed.

The nobles of Spain no longer had to fight anyone since the internal feuds were over. No one could challenge their power. In many ways it was held together as a reign of terror. People who challenged them were often called heretics, so that the Inquisition could torture them, and then nobles take the property.

For ordinary people on both sides of the Atlantic Ocean, life got worse. A few rulers got rich. Today we would say that these people were guilty of war crimes, genocide and crimes against humanity. Many Church people who had the power to speak out at that time, did so, and they said many of the same things as we would say today. But none of this mattered much to the rulers.
The great satire Don Quixote was written about this time.

18th century
In the 18th century, there was doubt over who should become king of Spain; this doubt led many of the kings of Europe to fight to become king of Spain. This was called the War of the Spanish Succession.

France occupied Spain for a long time. This made Spain very weak. It also made Spain lose its empire in North and South America; all of the parts of that empire became their own countries, or were taken over by other countries such as the United States of America.
20th century 
There was not much peace in Spain during the first part of the 20th century. Some Spaniards tried to set up a government chosen by the people (a democracy), and they made the King of Spain leave the country. However, in 1936, two different groups of Spaniards went to war over whether the government should be a democracy, or take orders from one person. In 1939, those who wanted democracy were defeated, and a dictator named Francisco Franco took over the government.

Franco died in 1975. He had decided that Spain should have a king again, and he chose Juan Carlos, the grandson of the king who had been forced to leave the country, to be king. But the king did not rule as a dictator; instead, he chose to set up a democracy. Also since Franco's death, Spain appointed Adolfo Suárez to became Spain's first democratically elected prime minister. Now Spain is a modern democratic country, and does business with many countries around the world. It is a part of the European Union.
Height is the distance between the lowest end and highest end of an object.

For example, it is said the bottom of the foot is a person's lowest end, and the top of the head is a person's highest end. If the distance between the bottom of a person's foot and the top of that person's head is 64 inches, then that person's height is 64 inches.

Height is measured in 3D objects. 2D objects do not have height; they only have length and width.

Related pages
 Depth
 Elevation
 Volume

Physical quantity
A historian is someone who studies history.  Historians use written sources to understand past events and societies.

Related pages
List of historians

References
Sources 
 Richard B. Todd, ed. (2004). Dictionary of British Classicists, 1500–1960, Bristol: Thoemmes Continuum, 2004 .
 Kelly Boyd, ed. (1999). Encyclopedia of Historians and Historical Writing. London [etc.] : Fitzroy Dearborn 
 Lateiner, D. (1989). The historical method of Herodotus. Phoenix, 23. Toronto: University of Toronto Press.
 John Cannon et al., eds. (1988). The Blackwell Dictionary of Historians. Oxford: Blackwell Publishers, 1988 .
 Hartog, F. (1988). The mirror of Herodotus: the representation of the other in the writing of history. Berkeley: University of California Press.
 Erik Christiansen (1970). The Last Hundred Years of the Roman Republic, Odense: Andelsbogtrykkeriet
 Gottschalk, L. R. (1950). Understanding history; a primer of historical method. New York: Knopf
 Barnes, M. S. (1896). Studies in historical method. Heath's pedagogical library. Boston: D.C. Heath & Co.
Taylor, I. (1889). History of the transmission of ancient books to modern times, together with the process of historical proof: or, a concise account of the means by which the genuineness of ancient literature generally, and authenticity of historical works especially, are ascertained, including incidental remarks upon the relative strength of the evidence usually adduced in behalf of the Holy Scriptures. Liverpool: E. Howell.
 Herodotus, Rawlinson, G., Rawlinson, H. C., & Wilkinson, J. G. (1862). History of Herodotus. A new English version. London: John Murray.
Véricour, L. R. d. (1850). Historical analysis of Christian civilisation. London: J. Chapman.
 Taylor, I. (1828). The process of historical proof. London: Printed for B. J. Holdsworth.
 Elizabeth Kostova "The Historian"
Writing occupations
The human body is the body of a person. It is the physical structure of a person.

The body is a thing that can be hurt or killed. Its functions are stopped by death. You need your muscles and your joints to move.

Study of the human body 

Some people study the human body. They look at where it is different from, or the same as, other animals' bodies. These animals can be alive today. Or they can be extinct animals like other hominids. (Hominids are primates that are close to humans. Neanderthals and Homo erectus were hominids.) Some people study how the human body works and lives in its environment. Some people study what people think about their body. Artists study how to draw or paint the human body.
Fields of study 
Many different fields of study look at the human:
 Biology is a field of science. It studies living things. It looks at how the human body works. It studies how the human body came from evolution. It studies how genetics makes the human body.
 Anatomy studies the parts of the body and how they work together.
 Ecology studies the environment including how humans affect it.
Physical anthropology is a field of science.  It compares humans to other hominids.  It also studies all other hominid bodies.  They look at how humans and chimpanzees are the same or different.
 Psychology is a field of medicine. It looks at how people think and feel. The brain is part of the body. How we think and feel comes from the brain. So psychologists study the body. They study how the brain lets us be who we are.
Religion also talks about the body. Some religions see the body as where the soul lives. Some see the body as like a church. This is because a church is where people worship God. These people think God should be worshiped inside people. Some religions think the body is made from chakras that connect us to the universe.
 Medicine sees the body like a machine.  Doctors want to fix problems with the body.  They study how to fix the problems, called diseases.
Parts of human body 

Head
Ear
Face
Forehead
Eyebrow
Eye
Cheek
Nose
Mouth
Lips
Chin
Neck
Torso
Chest
Breast
Abdomen
Umbilicus
groin
Pelvis
Vulva
Penis
Scrotum
Back
Upper limb
Shoulder
Axilla
Elbow
Forearm
Wrist
Hand
Finger
Lower limb
Buttocks
Thigh
Knee
Calf
Ankle
Foot

Organ system 

Various organ systems give the body the ability to live and do things.
circulatory system is the body system that moves blood around the body. 
 digestive system is the parts of the body that digest food.
 The endocrine system includes those organs of the body which produce hormones.
 immune system is the set of tissues which work together to resist infections.
 integumentary system is everything covering the outside of an animal's body.
 lymphatic system is a network of thin vessels that branch into tissues throughout the body.
 musculoskeletal system consists of the human skeleton and attached muscles.
 nervous system is a body system which sends signals around the body.
 reproductive system is the part of an organism that makes them able to sexually reproduce.
 respiratory system is the body getting rid of carbon dioxide and taking in oxygen.
 urinary system is a system of organs that makes urine/pee and takes it out of the body.
The human body and other animals 
The human body is like other animals. The skeleton, muscles and other parts are very much like those of other primates. Our body is also like other mammals, and somewhat like other vertebrates. DNA differences follow a similar pattern. The human genome is closer to that of other primates than to other vertebrates, and closest to chimpanzee.

References 

Anatomy
Hydrogen is a chemical element at the start of the periodic table. It has the symbol H and atomic number 1. It also has a standard atomic weight of 1.008, which makes it the lightest element in the periodic table.

Hydrogen is the most common chemical element in the Universe, making up 75% of all normal (baryonic) matter (by mass). Most stars are made of mostly hydrogen. Hydrogen's most common isotope has one proton with one electron orbiting around it.

Properties 
Hydrogen is grouped as a reactive nonmetal, unlike the other elements found in the first column of the periodic table, which are grouped as alkali metals. The solid form of hydrogen should behave like a metal, though.

When by itself, hydrogen normally binds with itself to make dihydrogen (H2) which is very stable, because of its high bond-dissociation energy of 435.7 kJ/mol. At normal temperature and pressure, this hydrogen gas (H2) has no color, smell, or taste and is not poisonous as it is a nonmetal and burns very easily.
Combustion 
Molecular hydrogen is flammable and reacts with oxygen:

2 H2(g) + O2(g) → 2 H2O(l) + 572 kJ (286 kJ/mol)

At temperatures higher than 500 °C, hydrogen suddenly burns in air.

Compounds 
While hydrogen gas in its natural form is not reactive, it does form compounds with many elements, especially halogens, which are very electronegative, meaning they want an electron very badly. Hydrogen also forms massive arrays with carbon atoms, forming hydrocarbons. The study of the properties of hydrocarbons is known as organic chemistry.

The H- anion (negatively charged atom) is named a hydride, though the word is not commonly used. An example of a hydride is lithium hydride (LiH), which is used as a "spark plug" in nuclear weapons.
Acids 
Acids dissolved in water normally contain high levels of hydrogen ions, in other words, free protons. Their level is generally used to determine its pH, that is, the content of hydrogen ions in a volume. For example, hydrochloric acid, found in people's stomachs, can dissociate into a chloride anion and a free proton, and the property of the free proton is how it can digest food by corroding it.

Though uncommon on Earth, the H3+ cation is one of the most common ions in the universe.

Isotopes 

Hydrogen has 7 known isotopes, two of which are stable (1H and 2H), which are commonly named protium and deuterium. The isotope 3H is known as tritium, has a half-life of 12.33 years, and is produced in small amounts by cosmic rays. The 4 isotopes left have half-lives on the scale of yoctoseconds.
Hydrogen in nature 
In its natural form on Earth, hydrogen is generally a gas. Hydrogen is also one of the parts that make up a water molecule. Hydrogen is important because it is the fuel that powers the Sun and other stars.
Hydrogen makes up about 74% of the complete universe. 

Natural hydrogen is normally made of two hydrogen atoms connected together. Scientists name these diatomic molecules. Hydrogen will have a chemical reaction when mixed with most other elements, though it has no color or smell.

Natural hydrogen is very uncommon in the Earth's atmosphere, because nearly all primordial hydrogen would have escaped into space because of its weight. In nature, it is generally in water. Hydrogen is also in all living things, as a part of the organic compounds that living things are made of. In addition, hydrogen atoms can join with carbon atoms to form hydrocarbons. Petroleum and other fossil fuels are made of these hydrocarbons and commonly used to make energy.
Some other facts about hydrogen:
 It is a gas at room temperature
 It acts like a metal when it is solid.
 It is the lightest element in the Universe.
 It is the most common element in the Universe.
 It burns or explodes at temperatures higher than 1000°F / 528°C, such as in fire.
 It glows purple when it is in plasma state.

History of Hydrogen 
Hydrogen was first separated in 1671 by Robert Boyle. In 1776, Henry Cavendish identified it as its own element and named it "inflammable air". He saw in 1781 that burning it made water.

Antoine Lavoisier gave Hydrogen its name, from the Greek word for water, 'υδορ (read /HEEW-dor/) and gennen meaning to "produce" as it forms water in a chemical reaction with oxygen.
Uses of Hydrogen 
The most common uses are in the petroleum industry and in making ammonia by the Haber process. Some is used in other places in the chemical industry. A little of it is used as fuel, for example in rockets for spacecraft. Most of the hydrogen that people use comes from a chemical reaction between natural gas and steam.

Nuclear fusion 

Nuclear fusion is a very powerful source of energy. It depends on forcing atoms together to make helium and energy, as in a star like the Sun, or in a hydrogen bomb. This needs a large amount of energy to get started, and is not easy to do currently. A big advantage over nuclear fission, which is used in today's nuclear power stations, is that it makes less nuclear waste and does not use a poisonous and uncommon fuel like uranium. More than 600 million tons of hydrogen undergo fusion every second on the Sun.
Using hydrogen 
Hydrogen is mostly used in the petroleum industry, to change heavy petroleum parts into lighter, more useful ones. It is also used to make ammonia. Smaller amounts are burned as fuel. Most hydrogen is made by a reaction between natural gas and steam.

The electrolysis of water breaks water into hydrogen and oxygen, using electricity. Burning hydrogen joins with oxygen molecules to make steam (natural water vapor). A fuel cell joins hydrogen with an oxygen molecule, releasing an electron as electricity. For these reasons, many people believe hydrogen power will replace other synthetic fuels in the future.
Hydrogen can also be burned to make heat for steam turbines or internal combustion engines. Like other synthetic fuels, hydrogen can be made from natural fuels such as coal or natural gas, or from electricity, and therefore represents a valuable addition to the power grid; in the same role as natural gas. Such a grid and infrastructure with fuel cell vehicles is now planned by a number of countries, such as Japan, Korea and many European countries. This lets these countries buy less petroleum, which is an economic advantage. The other advantage is that, used in a fuel cell or burned in a combustion engine as in a hydrogen car, the engine does not make pollution. Only water, and a small amount of nitrogen oxides, forms.

References

Other websites 
 Hydrogen - Citizendium

Hydrogen
Helium is a chemical element. It has the chemical symbol He, atomic number 2, and atomic weight of about 4.002602. There are 9 isotopes of helium, only two of which are stable. These are 3He and 4He. 4He is by far the most common isotope.

Helium is called a noble gas, because it does not regularly mix with other chemicals and form new compounds. It has the lowest boiling point of all the elements. It is the second most common element in the universe, after hydrogen, and has no color or smell. However, helium has a red-orange glow when placed in an electric field. Helium does not usually react with anything else. Astronomers detected the presence of helium in 1868, when its spectrum was identified in light from the Sun. This was before its discovery on Earth.
Helium is used to fill balloons and airships because its density is lighter than air. It does not burn, so  is  safe for that kind of use. It is also used in some kinds of light bulbs. People can breathe in helium: It makes their voices sound higher than it normally does. This may seem silly, but it can actually be quite dangerous as if they breathe in too much, hypoxia can injure or kill them as they are not breathing normal air. Breathing too much helium can also cause long-term effects to vocal cords.

Helium is created through the process of nuclear fusion in the Sun, and in similar stars. During this process, two hydrogen atoms are fused together to form one helium atom. On Earth it is made by the natural radioactive decay of heavy radioactive elements like thorium and uranium, although there are other examples. The alpha particles emitted by such decays consist of helium-4 nuclei.
History 
Helium was discovered by the French astronomer pierre Janssen on August 18, 1868, as a bright yellow line in the spectrum of the chromosphere of the Sun. The line was thought to be sodium. On the same year, English astronomer, Norman Lockyer, also observed it and found that it was caused by a new element. Lockyer and English chemist Edward Frankland named the element helium, from the Greek word for the Sun, ἥλιος (helios).

Characteristics 
Helium is the second least reactive noble gas after neon. It is the second least reactive of all elements. It is chemically inert and monatomic in all standard conditions. Helium is the least water-soluble monatomic gas.

Uses 
Helium is used as a shielding gas in growing silicon and germanium crystals, in making titanium and zirconium, and in gas chromatography, because it is inert. Helium is used as a shielding gas in arc welding.

Helium is mixed with oxygen and other gases for deep underwater diving because it does not cause nitrogen narcosis.
Helium is also used to condense hydrogen and oxygen to make rocket fuel. It is used to remove the fuel and oxidizer from ground support equipment before the rocket launches. It is used to cool liquid hydrogen in space vehicles before the rocket launches.

Helium is used as a heat-transfer medium in some nuclear reactors that are cooled down by gas. Helium is also used in some hard disk drives. Helium at low temperatures is used in cryogenics.

Supply 
Helium has become rare on Earth. If it gets free into the air it leaves the planet. Unlike hydrogen, which reacts with oxygen to form water, helium is not reactive. It stays as a gas. For many years after the 1925 Helium Act, the USA collected helium in a National Helium Reserve. American helium comes from wells in the Great Plains area. At present, more helium is supplied by Qatar than by the USA.
Several research organisations have released statements on the scarcity and conservation of helium. These organisations released policy recommendations as early as 1995 and as late as 2016 urging the United States government to store and conserve helium because of the natural limits to the helium supply and the unique nature of the element. For researchers, helium is irreplaceable because it is essential for producing very low temperatures. Helium at low temperatures is used in cryogenics, and in certain cryogenics applications. Liquid helium is used to cool certain metals to the extremely low temperatures required for superconductivity, such as in superconducting magnets for magnetic resonance imaging.

References
The home page of a website is the document that a web server sends to another computer's web browser application when it has been contacted without a request for specific information. That is, when one enters only a domain name in the Address box without specifying a directory or a file, the home page is usually the first part of the website one would be taken to. The Home Page is also called the Main Page.

A properly written home page will tell a user about the information available on the website, and how to view different parts of the website.

The home page of simple.wikipedia.org can be found at this link.

Home Page was a popular computer application used for composing web pages.

In Linux servers 
In Linux-based servers, the homepage is default.html, default.php, etc. This is a problem for website administrators to install website applications like MediaWiki. Mainly because most website applications are created with the homepage as index.php for PHP applications.
In Windows servers 
Similarly, in Windows-based servers, the homepage is default.html, default.php, etc.

Websites
Web design
Hair is something that grows from the skin of mammals. Hair is made of keratins, which are proteins.

Animal hair is usually called fur. Sheep and goats have curly hair, called wool. Wool is used to make many products, like clothing and blankets. 

Humans and some other animals have lost much of their hair through evolution, and some other mammals, such as the elephant and the whale, have almost none at all.

Functions of hair
Hair has different functions:
It can protect against losing body heat. This is thought to be the basic, original function of hair.
It protects against UV radiation, which damages the skin.
It can protect against rain or water. Air can be trapped in the fur, or oil can be secreted by the skin. Both these methods prevent the rain or water from  making the body too cold. Aquatic mammals in cold waters usually have blubber (fat) under the skin, and almost no hair.
Defence: hair is modified in mammals like porcupines, for protection.
Hair colouring can perform different functions. It helps to camouflage some animals. It can also signal to others of the same species. Examples are: signalling to females for mating purposes and signalling to others for territory control. Signalling danger to other species (aposematic colouring) is also done by, for example, skunks.
Animals can change their hair so they look bigger, or more threatening. This can also be used for mating; which is the case with lions, for example. Also, the male lions' mane also protects their neck from damage when fighting other males.
False hair
Some animals, for example certain insects and spiders also have hairs. However, these are not hair in the biological sense, but are actually bristles. The hairs found on certain plants are also not true hair, but trichomes.

Human hair 

In humans, hair grows mostly on the head, and the amount of body hair is different from person to person.

Hair color 

Hair color is passed down by parents only. Natural hair color can be given only by genes. Natural hair color is passed down genetically by both mother and father. This relies on dominant and recessive genes carried by a parent. These genes may not be the color of their hair, however, many people carry genes that are recessive and do not show in their traits or features.

Dyeing hair is to change the color of hair. It consists of a chemical mixture which can change the color of hair by a chemical reaction. Many people dye their hair to hide gray or white hairs. This is because most people gain white or gray hairs as they grow older.
Genetics and chemistry 
Two types of melanin pigment give hair its color: eumelanin and pheomelanin. Pheomelanin colors hair red. Eumelanin determines the darkness of the hair color. A low concentration of brown eumelanin results in blond hair, but more brown eumelanin will color the hair brown. High amounts of black eumelanin result in black hair, while low concentrations give gray hair. All humans have some pheomelanin in their hair.

The genetics of hair colors are not yet firmly established. According to one theory, at least two gene pairs control human hair color.

One phenotype (brown/blond) has a dominant brown allele and a recessive blond allele. A person with a brown allele will have brown hair; a person with no brown alleles will be blond. This explains why two brown-haired parents can produce a blond-haired child.
The other gene pair is a non-red/red pair, where the not-red allele  is dominant and the allele for red hair is recessive. A person with two copies of the red-haired allele will have red hair, but it will be either auburn or bright reddish orange depending on whether the first gene pair gives brown or blond hair, respectively.

The two-gene model does not account for all possible shades of brown, blond, or red (for example, platinum blond versus dark blonde/light brown), nor does it explain why hair color sometimes darkens as a person ages. Several other gene pairs control the light versus dark hair color in a cumulative effect (quantitative genetics).

Hair texture 
Hair texture is also inherited genetically. The thickness of hair, its color and its tendency to curl are all inherited. There are also genetic differences between men and women.
Hair loss 
People have about 100,000 hairs on their head.  About 100 fall out each day, but they usually grow back. Some men are bald but girls and women may become bald if they lose their hair from a disease called alopecia.

Men often lose some of their hair as they grow older. This is known as baldness. Doctors call it "male pattern baldness" because hairs often fall out in similar places. It often begins by hair falling out first from the front of the head, and then from the top of the head. After a while, all that may be left is a some hair running above the ears and around the lower back of the head. Even though it is unusual for women to go bald, many women suffer from thinning hair over the top of their head as they grow old.
History and culture 
  People have been interested in hair on their heads for hundreds of thousands of years. For both men and women, styling and coloring hair have been ways to look good, and get attention. Sometimes society makes rules about hair, for example by not allowing people to cut their hair or beards, like in Sikhism

References

Basic English 850 words
Ireland (;  ; Ulster-Scots: ) is an island in the North Atlantic. It is about 486 kilometres (302 miles) long and about 288 kilometres (179 miles) wide. To the west of Ireland is the Atlantic Ocean; to the east of Ireland is the island of Great Britain. Over 6.4 million people lived on the island in 2016.
Countries
Today, the island of Ireland is made up of two countries: the Republic of Ireland and Northern Ireland:
 The Republic of Ireland is a sovereign state and occupies 84% of the island. Its capital and largest city is Dublin. The official languages of the Republic are Irish and English. Even though Irish is official in the country, only a small part of the population is fluent or a native speaker. While the Irish language (or Gaelic) is taught in most schools, most people speak English in their day-to-day lives.
 Northern Ireland, which is one of the four countries of the United Kingdom, makes up the remaining 17% of Ireland and is in the north-east part of the island. It has a population of 1.8 million people, and its capital and largest city is Belfast.
 During the 1550s and the 1650s four plantations had taken place in Ireland.
Facts 
 The flag colours of the Republic of Ireland are green, white and orange.
 A symbol of Ireland is the shamrock.
 Popular games in Ireland include Gaelic football and hurling.
 The population of the Republic of Ireland is around 4.7 million.
 The president of the Republic of Ireland is Michael D. Higgins.
 The two parts of Ireland are the Republic of Ireland and Northern Ireland.
 The River Shannon, which runs from north to south, is the longest river on the island. Ireland has many lakes and Lough Neagh, in Northern Ireland, is the largest lake in Ireland. Ireland is known for its landscapes, music, history, and mythology.
 the great potato famine was very bed about 1 million people died