Aarushhh/wikipedia-simple-splitted huggingface dataset:
Of all the wars ever fought, World War II involved the most countries and killed the most people. More than 60 million people died, making it the worst disaster of all time. It lasted six years in Europe, from 1939 to 1945.
It was fought between the Axis Powers (Germany, Italy and Japan) and the Allied Powers. At first the Axis Powers were successful, but that ended in Europe with the Battle of Stalingrad in 1943 and the invasion in Normandy in 1944. But Hitler was able to pursue his plan to annihilate Jews nearly all over Europe. Today, this plan is called the Holocaust.
In the Pacific it ended with the battles of Midway and Guadalcanal. Germany surrendered on May 8. The Soviet invasion of Japan led Japan to surrender on August 15, 1945.
After World War II 
After World War II the United Nations was founded in the hope that it could solve arguments among nations and keep wars from happening. Communism spread to Central and Eastern Europe, Yugoslavia, Bulgaria, Romania, Albania, North Vietnam and North Korea. In 1949, China became communist. During the 1950s and 1960s, many third world countries became communist.

This led to the Cold War, a forty-year argument between the United States, the Soviet Union, and their allies (mainly countries that were members of NATO or the Warsaw Pact). Each country wanted to promote their type of government. The Soviet Union wanted to spread communism, and the United States wanted to spread democracy. People across the world feared a nuclear war because of the tension.
Communism became less popular when it became clear that it could not promote economic growth as well as Western states and that it was not suited for a reform that allowed freedom of speech for everybody. Therefore, the Soviet Union forced Hungary to give up its reform in 1956, it favored the building of the Berlin Wall in 1961 and it stopped reform in Czechoslovakia in 1968. When in 1988/89 Gorbachev made clear that he would not force the countries of the East block to stick to Communism the Berlin Wall was torn down in 1989 and the Soviet Union collapsed (1991). Then the United States was the only superpower left.

After Mao Zedong's death China's communist party proved that economic reform was possible without political freedom and paved the way for enormous economic growth.

As the 20th century ended, the European Union began to rise and included former satellite states and even parts of the Soviet Union. States in Asia, Africa and South America tried to copy the European Union.
The twentieth century was a time of great progress in terms of technology. People began to live longer because of better medicine and medical technology. New communications and transportation technologies connected the world. But these advances also helped cause problems with the environment.

The last half of the century had smaller wars. Improved information technology and globalization increased trade and cultural exchange. Space exploration expanded through the solar system. The structure of DNA was discovered.

The same period also raised questions about the end of human history because of global dangers: nuclear weapons, greenhouse effect and other problems in the environment.

21st century
21st century 

During this period, communications with mobile phones and the Internet expanded. This led to social changes in corporation, political, and individuals' personal lives. Because of population growth and industrialization, worldwide resource competition became increasingly high. The increasing demand affected environmental degradation and global warming, as well the globalization has continued.

A new Great Recession affected the world in the late 2000s and the early 2010s.  The COVID-19 pandemic in 2020 caused further global economic and political disruption. Some scientists referred to this as a "Planetary Phase of Civilization".

Related pages 
 History of Africa
 History of America
 History of Asia
 History of Australia
 History of Europe
 History of the Earth

References

Further reading 
 
English translation by Paul G. Bahn from the French edition La Grotte Chauvet
 
 
Translation of La Grotte Chauvet, l'art des origins, Éditions du Seuil, 2001
Other websites 
 Universal Concise History of the World, 1832 Full text, free to read, American book on the history of the world with the intriguing perspective of 1832 America.
 WWW-VL: World History  at European University Institute
 Five Epochs of Civilization A scheme of organization which divides world history into five epochs marked by changes in communication technology
 World history -Citizendium

+
Former good articles
Ur was the one of the world's first cities, in Mesopotamia. It was a Sumerian city-state, founded around 3,800 BC. There are written records dating from the 26th century. Ur was once a coastal city near the mouth of the River Euphrates on the Persian Gulf. It is now well inland, south of the Euphrates on its right bank,  from Nasiriyah, Iraq.
Ziggurat 
In the Sumerian city, the Ziggurat of Ur was a skyscraper over the city. It was about 20 metres (66 feet) tall. The only level that remains today is the bottom. There were big staircases to get up and down. They tell a lot about the people who built them. Sumerians had no tools and machinery like us. They were careful brick builders. Brickmakers formed mud bricks that were perfect. After drying they took them to the site and set them in place with bitumen. Bitumen is a thick sticky black stuff. It's like asphalt, the stuff they use to pave roads. They braided reeds so they would be stronger, and hooked them up like steel cables. Later the Ziggurat became more than a place for gods. There were workshops for craftworkers. For the priests, there were temples to do worship.
Social classes 
Ur had three social classes. The richer, like government officials, priests, and soldiers, were at the top. The second level was for merchants, teachers, laborers, farmers and craftmakers. The bottom were for slaves captured in battle. Burials at Ur give insight into people's social standing. Kings and queens were buried with treasure. Since irrigation gave Ur abundant crops, not everybody needed to work on farms. People learned other skills. Sir Leonard Woolley found a tablet that listed Ur's special workers. The chisel workers made sculptures, the gem cutters made gems, and the fullers stomped on woven wools to make them soft. The metal workers made weapons.

References 

Mesopotamia
The Odenwald is a mountain chain in the south of Hesse, in the north of Bavaria and the north of Baden-Württemberg.

Geography 
In the south of the Odenwald there is the Neckar River. In the east there is the Main River . In the west there is the valley of the Rhine River. The highest mountain is the Katzenbuckel (literally "cat's hump", 626 m).

Neighboring cities 
The big cities Mannheim and Frankfurt am Main are near to the Odenwald. People of these cities like to go there at holidays. It is known for its clean thin air. There are many marked hiking paths. You can find wild blueberries, strawberries and mushrooms in the forests. 

Several small towns are very beautiful like Weinheim on the Bergstraße and Michelstadt.  The mild climate of the area is well known. 

Geography of Baden-Württemberg
Geography of Bavaria
Geography of Hesse
Mountain ranges of Germany
Sviatoslav I was an early ruler of the Kievan Rus', a nation that evolved into modern Ukraine. He was the son of Igor I of Kiev and Olga of Kiev. He ruled from 962 until 972. During his reign he destroyed the Khazar Empire and for a short time conquered what is now Bulgaria.

Russian nobility
940s births
972 deaths
Citrus is a common term and genus of flowering plants in the family Rutaceae.  It originated in tropical and subtropical southeast Asia. The name comes from the citron.

Citrus fruits usually have a sour taste but farmers grow more of the sweet ones. There are many types of citrus fruits in the world.

List of citrus fruits 
Citron
Clementine
Grapefruit
Hyuganatsu
Kumquat
Lemon
Rough Lemon
Lime
Kaffir lime
Key lime
Leech Limes
Mandarin orange
Minneola
Orange (fruit)
Pomelo
Satsuma
Shonan gold
Sweety
Tangerine
Tangelo
Ugli
Imperial Lemon
Citron
Red finger lime
Amanatsu
Orangelo
Oroblancho
Tangor
Yuzu
Daylight saving time (DST) or summer time (ST) is a time to keep during summer.  During the summer months, the sun stays visible for a longer time, and sunset happens late in the day.  For this reason, certain countries advance the time by one hour near the start of summer, and put it back one hour during autumn.

DST helps stores that sell to people after they get off work, and it doesn't hurt farmers and others whose hours are set by the sun. It cuts traffic accident rates. Sometimes it can reduce energy costs, but it can also increase them.

Most of the world's countries do not use DST, but it is common in Europe and North America.

The United States, Australia, the United Kingdom, Canada and many other countries have DST. These countries also have regions that do not have DST:
United States: most of Arizona and Hawaii
Australia: Queensland, Western Australia and the Northern Territory
Canada: Saskatchewan except for a few locations with the border with Alberta and Manitoba, and the Yukon Territory
Iceland, Russia, Belarus, and some parts of Ukraine are countries in Europe without DST.

Europe 
Since 1971 all clocks in the European Union have changed on same dates and at the same time, 06:00 GMT.

European Summer Time begins (clocks go forward) at 01:00 UTC on the last Sunday in March, and ends (clocks go back) at 01:00 UTC on the last Sunday in October:

United States
The following table lists future starting and ending dates of daylight saving time in the United States:

Permanent GMT+1 
Permanent Summer Time has support in some northerly countries such as the UK. It was tried in the  British Standard Time experiment, with Britain remaining on GMT+1 throughout the year. This took place between 27 October 1968 and 31 October 1971.
There are proposals for GMT+1 in the winter, and DST summer time (GMT+2) in the summer. In favour are most city dwellers: children do not have to come home after school in the dark, and late afternoon and early evening activities benefit. In favour also were those concerned with accidents, because both accidents and fuel consumption go down.RoSPA suggests this would reduce the number of accidents over this period as a result of the lighter evenings.

Against are many farmers in northerly latitudes, because sunrise would occur in winter at about 10:00 in the morning. However, in March 2010 the National Farmers Union said that it was not against Single/Double Summer Time, and is in fact relatively neutral, with many farmers expressing a preference for the change.
Automatic adjustment 
Most mobile phones and computers connected to the Internet will automatically adjust their clocks for DST. Some computers will not adjust or will adjust the time incorrectly or on the wrong date. Also, computers with more than one operating system may be incorrectly adjusted twice or more when each operating system boots.

References

Other websites 
 Daylight Saving Time – Time Change. TimeAndDate.com
 About Daylight Saving Time - History, rationale, laws & dates . WebExhibits

Time zones
Lanthanum is a chemical element. It has the chemical symbol La. It has the atomic number 57. It is part of a group of chemical elements in the periodic table named the Lanthanides. It is a rare earth element. It is silvery white, malleable and ductile. It is soft and can be cut with a knife.

Lanthanides
Rowing is about moving a boat on water using human muscle power. It can be a sport. The goal in rowing is to move as fast as possible on top of the water. The athletes use a boat. They move the boat forward by using two sculls or one oar. There are different types of rowing. The types depend on how many people are in the boat and if they have a coxswain or not. Rowing is a very popular sport in England, the Commonwealth, and the Northeastern United States. The old universities of the United States and England have yearly rowing matches.

Other websites 

 FISA – The Official World Rowing Website
 Rachel Quarrell's Rowing Service – UK rowing news and information site.
 Row2k.com – Worldwide Rowing information site with news, results and photographs.

 
Summer Olympic sports
An Inkjet printer is a printer for computers. It uses special ink to print on the paper. Another type of printing technology is the Laser printer. Inkjet printers are preferred for printing photos and graphics due to their high-quality color output, whereas laser printers are preferred for printing text due to their high contrast and speed.

Usually, inkjet printers are used by people who print very little. The ink comes in special ink cartridges, which can be very expensive and uneconomical. Also, the ink in the cartridge may dry up. This means that a new cartridge is needed. Three colors of cartridges, which combine magenta, yellow and cyan inks are used to create color tones. A black cartridge is also used for crisp monochrome  output. Some professional printers have one or more additional colors for better photo quality, such as light cyan, light magenta, blue, red, green, orange, and grey.
Inkjet printers may use either dye or pigment inks. Pigment inks are less likely to fade, whereas dye inks create more-realistic photos and are less likely to clog the printhead.

Many professionals use inkjet printers to print on very large surfaces (up to 5m width). These printers usually do not use cartridges, but have a continuous supply of ink that could last for a long time. Standard-size (A4 or US Letter) printers with a continuous ink supply are also available.
Inkjet printers need special paper. This paper has been treated so that the ink does not smear. 
Less expensive inkjet printers, which cost a little more than 100 US dollars, are a bargain for users who want to be able to print pages in color. Inkjet printers can be very cheap but the ink can also be rather expensive. Some professional inkjet printers can print on surfaces other than paper, such as CDs/DVDs or plastic cards.
An inkjet printer can print between 300 and 720 DPI (Dots Per Inch). Some newer printers can print at higher resolutions, although the benefit of resolutions beyond 720 DPI may not be noticed by the human eye.

A common problem with inkjet printers is that if the printhead is clogged, banding (stripes) will appear in the printed image. To fix this, the printhead needs to be cleaned using the software included with the printer. This problem occurs most often when the printer has not been used for a long time. To prevent this from happening on rarely-used printers, a cron job can be scheduled to print a purge sheet (an image containing all colors used by the printer) once per day. A small, barely noticeable (usually only noticeable by magnification) amount of banding will occur even with a perfectly clean printhead due to the way the printer works.

Printers
A laser printer is a printer for computers. It uses laser or LED-technology to get small particles of toner from a cartridge onto paper.  Very often, this costs less to use than the ink of inkjet printers.  Laser printers often print text more neatly than inkjet printers, but print photos less clearly. Printing on photo paper or coated paper designed for inkjet printers can damage the laser printer's drum and fuser unit.

The laser printer was first invented by a team at Xerox in 1969. The first laser printer was called the Xerox 2000.

Process 
Laser printing is a process which typically involves seven steps:
Raster Image Processing: the processor inside the printer converts the data to be printed from its current file format, into a bitmap of the page to be printed - this is then stored in raster image memory.
 Charging: An electrostatic charge is then projected onto a revolving photosensitive drum inside the printer.
 Writing: A laser beam is directed at a rotating polygonal mirror, which redirects the beam onto the photosensitive drum. The rasterized data in memory is now read, and used to control whether the laser is on or off, as the beam sweeps across the drum - where the laser beam strikes the drum the charge is reversed, creating a latent electrical image on the surface. Some laser printers use an array of tiny LEDs instead of a sweeping laser beam.
Developing: The surface of the drum is then exposed to negatively charged particles of toner, which are attracted to the areas where the laser wrote the latent electrical image. The toner will be repelled by the negative charge on areas of the drum where the laser beam did not strike, and hence remove the charge.
 Transferring: The drum is now rolled over paper, transferring the image from the drum to the paper (to aid in this process there is a positively charged roller behind the paper, which pulls the toner off the drum and onto the paper).
 Fusing: The paper is then passed through a fuser, where rollers provide heat and pressure to bond the toner to the paper.
 Cleaning: An electrically uncharged blade and a discharge lamp remove any toner and all the charge remaining on the drum (this will all happen in one revolution of the drum).
Lawrencium is a chemical element. It is also named eka-lutetium by some people. It has the symbol Lr. It has the atomic number 103. It is a radioactive element that does not exist in nature. It has to be made. Lawrencium is made from californium. The isotope that has the longest half-life (262Lr) has a half life of about 3.6 hours.

No uses for lawrencium are known. What lawrencium looks like is not known because not enough has been made to see it with human eyesight.

Is a Block-D Group3 Period 7 element. Discovered by Albert Ghiorso and co-workers in 1961, in California. Named after Ernest O. Lawrence, inventor of the cyclotron, a research instrument with which several new elements have been found/made.

Related pages
 Periodic table
 List of common elements

Transition metals
Synthetic elements
Darmstadtium is a chemical element. It has been named ununnilium (Uun) or eka-platinum but is now named darmstadtium. It has the symbol Ds. It has the atomic number 110. It is a transuranium element.

The element is named in honor of German city Darmstadt.

Darmstadtium is a radioactive element that does not exist in nature. It has to be made. The isotopes with an atomic mass from 267 to 273 have very short half-lifes. The half life of these isotopes is measured in milliseconds. Isotopes of darmstadtium with an atomic mass of 279 and 281 were synthesised after the other isotopes. Ds-279 and Ds-281 decay more slowly. The isotope with an atomic mass of 279 has a half life of 180 milliseconds and Ds-281 has a half life of 11.1 seconds.

No uses for darmstadtium are known. What darmstadtium looks like is not known because not enough has been made to see it with human eyesight.
History 
Darmstadtium was first made on November 9, 1994. It was made at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany. Only a few atoms of it were made. It was made by bombarding a lead target with nickel. A nuclear fusion reaction happened and made the element.

This is shown by the equation below that is the reaction that happened. Pb is the symbol for lead, Ni is the symbol for nickel and n is the symbol for a neutron.

Pb + Ni→ Ds + n

The element was named for Darmstadt which was the place of its discovery. The GSI is in Wixhausen, a part of the north of the city of Darmstadt. The new name (darmstadtium) was given to the chemical element by the IUPAC in August 2003.

References

Other websites 

 WebElements.com - Darmstadtium
 IUPAC: Element 110 is named darmstadtium 
 Apsidium - darmstadtium 

Transition metals
Darmstadt
Synthetic elements
The Wampanoag were a Native American tribe. They lived in what is now the American region of New England. This is part of the Northeastern Woodlands. They are part of the Northeast Woodlands. The Wampanoag tribe helped the English settlers to survive after they arrived in the Mayflower.

They caught a bacterial infection called leptospirosis or Weil's syndrome in the early 17th century. It caused many deaths and damaged their society greatly, though their descendants still survive today.

Native Americans
Hindu temple or Mandir is referred to a place where Hindus go to worship gods in the form of various deities. Many Hindu temples are filled with wooden and stone arts like pashupatinath temple. A mandir is a spiritual place for Hindus. It is the landmarks around which ancient arts, community celebrations and economy were developed, as well as this the mandir has been recognised for.

It is believed that the Murtis are stone or wooden images of idols ceremonially infused with the divine presence of God. They worship with arts and other ceremonies.

Purpose 
Hindus believe that gods and goddesses will answer the prayers of the faithful and inspire spiritually. For them, the temple also acts as a contact between the gods and goddesses and the worshipers. They also believe that the gods and goddesses will grant their wishes and protect them from danger.
Appearance 
In Hinduism gods are represented in various forms. Sometimes gods or goddesses are represented in a human form like Shiva, Vishnu, Saraswati or Kali. Sometimes there are gods goddesses in human and animal fused form like Ganesh. Sometimes they are also represented in plants and non-living form like Tulsi and Shaligrams. Murtis are made according to the prescriptios of the ilpasastra, and then installed by priests through the prana pratishtha ceremony. Afterward the divine personality is believed to be present in the Murtis.

Method 
To show respect, Hindus give gifts and food to the murtis. They are treated with respect and worshipped everyday. If a temple is a family temple it is treated as part of the family. Some Hindus also offer a part of their daily food to the god or goddess. They are given clothes and are changed at certain times.

References

Hinduism
Kitchener is a city in Ontario, Canada. Kitchener is in Southwestern Ontario and is near Toronto, Hamilton, Mississauga and London. It is in Waterloo Region. Other cities in Waterloo Region include Waterloo and Cambridge. Sometimes Kitchener, Waterloo, and Cambridge are known as the "technology triangle". It is on the Grand River, which leads to Lake Erie.

History 
At first, Kitchener was called Berlin. When World War I started it seemed like a bad idea to have a city named after the capital of Germany. The city was renamed Kitchener, after a British general, Herbert Kitchener. Kitchener then slowly became a prosperous city as it is today.

Future 
A rapid transit system is planned to be added in the Waterloo Region.

Media 
CHYM 96.7

CKWR 98.5
CKWR 98.5

Other websites 
 City of Kitchener
 Centre in the Square 
 The Record Newspaper (Serving Waterloo Region)
 Satellite image courtesy of Google Maps
 Grand River Transit (serving Waterloo, Kitchener and Cambridge)
 Grand River Monorail (competing proposal for a Rapid Transit line through Waterloo, Kitchener and Cambridge) 

Cities in Ontario
A spring is a place where groundwater flows out of the ground. A spring may flow the whole year or only sometimes. This depends on the water getting into the ground all of the time (rain) or only once in a while (snow melting).

Water from a spring often flows downhill, along the land. This is how rivers start.

Some springs produce water that is good for health reasons. Sometimes towns grow by these springs because many people who are ill come there to get better. Such towns are called spa towns.

Other websites 
"The Science of Springs" (via Wayback Machine)
"What Is A Spring?"
List of First-Magnitude springs in Florida 
Technical and educational material on mineral springs and mineral water in Victoria 

Bodies of water
Thorium is a chemical element in actinide group. It is a weakly radioactive metal. It has a shiny, silvery white color. It has the chemical symbol Th and the atomic number 90. Natural thorium has an atomic weight of 232. Thorium is named after Thor, the Norse god of thunder. Its ores are found in nature (that is, on Earth), especially in India, the United States, and Australia. 

Thorium would make a good source of nuclear fuel because it makes much less waste and is four times as common as uranium. It does not need the wasteful process of enrichment. It makes 3,200,000 times as much energy as coal and 200 times as much energy as uranium. Scientists believe that there is enough of it to power the world for thousands of years. Thorium has been used for various purposes since the 19th century. It is an alloying agent in magnesium and is also used as an industrial catalyst.
Thorium is safer than uranium. This is because thorium cannot undergo nuclear fission on its own. Usually, plutonium is need to start and maintain a reaction. This is why thorium is considered better for nuclear reactors. Also, nuclear waste from thorium reactors contains far smaller amounts of dangerous transuranic elements than waste from uranium reactors.

References

Other websites
EnergyFromThorium.com
Thorium - WebElements.com
Thorium - World-Nuclear.org

Actinides
Energy
Nuclear power plants
The source of a river or stream is the original point from which the river flows. It may be a lake, a marsh, a spring or a glacier.  This is where the stream starts.

The source is the farthest point of the river stream from its estuary or its confluence with another river or stream.  Rivers are usually fed by many tributaries.  The farthest stream is called the head-stream or head water. There is sometimes disagreement on which source is the head water, hence on which is the true source. 

A lake fed by many rivers is sometimes called the source of the bigger river flowing out of it. For example, Lake Victoria is often called the source of the Nile, as the rivers that flow into it have names of their own. 

Headwaters are usually in mountains. Glacial headwaters are made by melting of glaciers.

The source is where a river begins, and the river mouth is where it joins the sea.  The mouth may be in the form of a river delta.  The joining of a streams is called a confluence.

Related pages 
Fountain

Rivers
A Laserdisc, like a DVD, can play video of a higher quality than VHS. A Laserdisc is much larger than a DVD. To play Laserdisc movies, a LaserDisc player is needed. LaserDisc was also known by the names DiscoVision and LaserVision.

Laserdisc was first produced by MCA in 1978, and became well known in the 1980s. Movie companies stopped making Laserdisc movies when DVDs became well known in the late 1990s. Today some of the better Laserdisc players still sell for $1,000 USD or more.

Technology
Laser Discs work like a regular CD-ROM or DVD. The surface of the disc is covered with small holes that are read by a laser. This sequence of holes and no holes is turned into pictures and sound by the Laserdisc player. Most Laserdiscs can hold about 30 minutes to an hour of video per side for a total of 1 to 2 hours per disc.
The early Laserdisc players used a Helium-Neon laser to read the disc, but the later models used infrared lasers. The first units that were made with the infrared laser had some problems such as skipping, strange colors spots, and fuzziness. These problems were fixed in later models.

Some of the later Laserdisc players made were ones that could play Audio CDs as well as Laserdiscs. In Japan, one of the last models to be produced even had the ability to play DVDs as well as CDs and Laserdiscs.

Other websites
LaserDisc Database

Optical discs
Video Discs

el:Μέσο αποθήκευσης δεδομένων#Laserdisc
Californium is a chemical element. It is a radioactive metal. It has the chemical symbol Cf. It has the atomic number 98. Californium is a transuranium element.  Californium does not have many uses. It was discovered by bombarding a curium target with alpha particles (helium ions). Californium is named after the US State of California, where it was discovered, in the University of Berkeley.

Californium is produced in nuclear reactors and particle accelerators. 
There are 20 known isotopes. The most stable is californium-251, which has a half-life of 898 years. This short half-life means the element is not found in the Earth's crust. Californium-252, whose half-life is 2.645 years, is the most common isotope used.
Compounds of californium are mostly of californium(III), which can take part in three chemical bonds. Californium can be used to help start up nuclear reactors, and is used as a source of neutrons. It can be used in making higher mass elements. Ununoctium was synthesized by bombarding californium-249 atoms with calcium-48 ions.

Safety 
When californium is used, workers must be protected from the element's ability to disrupt the formation of red blood cells.

References 

Actinides
Synthetic elements
Torgau is a town on the banks of the Elbe in northwestern Saxony, Germany. The town is well known as the place where during the Second World War, United States Army forces met with forces of the Soviet Union during the invasion of Germany on April 25, 1945.

This marked the beginning of the line of contact between Soviet and American forces, but not the occcupation zones. In fact the area surrounding Torgau at first occupied by U.S. forces was later, in July 1945, given over to Soviet forces.

References

Other websites 

 http://www.torgau.de
 http://www.torgau-oschatz.info 

Nordsachsen
Chemical bond is a type of attraction force which holds together different chemical species. Atoms bonded stay together unless the needed amount of energy is transferred to the bond. 

In general, strong chemical bonding comes with the sharing or transfer of electrons between the participating atoms. The atoms in molecules, crystals, metals and diatomic gases are held together by chemical bonds. 

There are two types of bonds; covalent and ionic. Covalent bonds form when atoms share electrons. Ionic bonding is the attraction between oppositely charged ions. Chemical bonds are negatively charged electrons that are pulling protons into each other.

Because atoms and molecules are three-dimensional, it is difficult to use a single method to indicate orbitals and bonds. In molecular formulas the chemical bonds between atoms are indicated in different ways depending on the type of discussion.
A common way chemists describe chemical bonds is through the number of electrons each atom has on itself. Each atom is drawn with the number of electrons as dots or lines to form a maximum of eight.  If the electrons form a chemical bond then a line is drawn between the two electrons. The number of bonds developed increases the number of lines.

Bonds can be double bonds or triple bonds.

Triple bond

Use of Lewis structures to show what is connected thru chemical bond(s)

Related pages 
Chemical formula
Double bonds

References 

Quantum chemistry
Energy
A physical property is a property, quality or way that an object is. A physical property can always be measured without changing or making the object chemically different or different in a way that would effect its chemical or atomic structure. There are two types of physical properties: intensive and extensive.

Intensive physical properties do not depend on how much of the object there is. For example, a small rock will be just as hard as a large rock. hardness, softness and speed (quickness) are intensive physical properties.

Extensive physical properties change depending on how much of the object there is. For example, a small rock weighs less than a large rock. Volume, total mass, and weight are extensive physical properties.

Physics
Measurement
A concept is an idea that is applied to all objects in a group. It is the way people see and understand something. The name used to identify a concept (the concept's label) is a "term". For example, the word "Dog" is the term to identify the concept of what a dog is. Everything that a person knows about a dog is the concept of the term dog. 

Different terms can be used to identify the same concept. Car and Automobile are synonyms for the same concept. Different languages have different terms for the same concept. This is what makes translation possible. The terms may be different in each language, but the concept is the same. The concept of jumping is the same to a person from England and a person from Italy, but one person uses the term "Jump" to mean the concept and the other person uses "Salto".

Related pages 
Abstraction

 

Language
Philosophy
Kenpo or kempo is the descriptive name of various Japanese martial arts with Chinese origins, and also of hybrid martial arts: the Japanese ones and the Chinese ones. Kenpo is similar to karate and includes more punches and kicks than holds or joint locks of wrestling.

More known styles of Kenpo  
 American Kenpo 
 Kajukenbo 
 Seishindo Kenpo
 Shorinji Kenpo (Kenpo of Shaolin) 
 Kempo Tai Jutsu 
 Tracy Kenpo 
 Kenpo Jiu-Jitsu 
 Kenpo Kai
Kempo is a Japanese Martial Arts form. However, unlike Karate, its origins are linked back to China and still have very strong influences from Chinese systems. 
It is not uncommon for a Kempo artist to both use traditional Japanese and Chinese style techniques. The difference lies in that because of the Chinese influence, the Japanese moves tend to emphasize more fluidity than most of the other Japanese styles. And because of the Japanese influence, there is a stronger focus for shorter stances and movements than other Chinese styles.
For the same reason that many other styles are sometimes simply listed as "karate", Kempo has long been strongly linked under the general banner of "karate". Kempo is known for its near explosive, short-ranged attacks that often move faster than the opponent can see.
Other websites 
 European Kenpo Kai Organization Website

Japanese martial arts
Edge can mean:
In geometry, an edge is where two surfaces meet.
In graph theory, an edge is a connection between two nodes (or vertices)
In geology, it describes an escarpment
It can stand for Enhanced Data Rate for GSM Evolution. This is a way to make mobile phones transmit data faster than with GSM
Microsoft Edge, an internet browser.
The Edge (born 1961), Irish musician, member of U2
Edge (wrestler) (born 1973), ring name of Canadian professional wrestler Adam Copeland.

Basic English 850 words
Tyr is a god in Norse mythology. In the Eddas, he is either the son of Odin or Hymir. He is the god of single (man-to-man) combat. Tyr only has one hand.

How Tyr lost his hand 

At one point in time, the gods decided that the wolf Fenrir (also called Fenriswolf) could no longer go free. They wanted to lock him up onto a chain. But he broke every chain they tried to put on him. Finally, they had the dwarves make a magical chain. But Fenrir sensed what the gods would do. So Fenrir asked that one of them put his hand into his mouth. Knowing that if Fenrir was left unfettered, he would have grown strong enough to kill all the gods and destroy the world. Tyr was the only one who had the courage. When Fenrir sensed he had been tricked, he bit off Tyr's hand. Tyr remained handless forever.

Fenrir will remain bound until Ragnarök. Then, Tyr's opponent will be Garm, the guard dog of Hel.

Norse gods and goddesses
Loki (, often Anglicized as ) is a god in Norse mythology. Loki is  the son of Fárbauti  and the brother of Helblindi and Býleistr. Loki is married to Sigyn. They have a son, Narfi and/or Nari.  Loki is the father of Hel, the wolf Fenrir, and the world serpent Jörmungandr.  While in the form of a horse, Loki was impregnated by Svaðilfari and gave birth to the eight-legged horse Sleipnir. Loki is referred to as the father of Váli in Prose Edda. This source also refers to Odin as the father of Váli twice and Váli is only said to be a son of Loki once.
Loki's relation with the gods varies by source. Loki sometimes helps the gods and sometimes behaves badly towards them. Loki can change his shape. He has appeared in the form of a salmon, a mare, a fly, and possibly an old woman named Þökk . Loki's good relations with the gods end with his role in causing the death of the god Baldr. During Ragnarök, Loki is said to fight against the gods among the forces of the jötnar. He will fight the god Heimdallr, and they two will kill each other.

Loki is talked about in the Poetic Edda,  the Prose Edda and Heimskringla, the Norwegian Rune Poems, in the poetry of skalds and in Scandinavian folklore. Loki may be shown on the Snaptun Stone, the Kirkby Stephen Stone, and the Gosforth Cross. Scholars disagree about Loki's origins and role in Norse mythology. Some have described him as a trickster god.
Other media
Loki has been used in many different forms of media in modern popular culture. Most notable of this is his use in Marvel Comics and the Marvel Cinematic Universe. Tom Hiddleston has played Loki in the movies Thor, Thor: The Dark World, Thor: Ragnarok, The Avengers and Avengers:Endgame. He also played versions of Loki in the TV series Loki on Disney+.

Norse gods and goddesses
Freyja (Old Norse: “[the] Lady”) is the goddess of love, beauty, sex, fertility, seiðr, war, and death in Norse mythology. A member of the Vanir, Freyja is the daughter of Njörðr, and twin sister of Freyr. The most beautiful and refined of the goddesses, she owns the necklace Brísingamen, and rides in a chariot pulled by two cats, accompanied by a giant boar named Hildisvíni; in addition to this, Freyja possesses a cloak of falcon feathers. She is married to the god Óðr, by whom she is the mother of the twin goddesses Hnöss and Gersemi. Freyja rules over the heavenly field(s) of Fólkvangr, where she receives half of those that die in battle, as the other half go to Valhalla. The minor goddesses Gefjon, Skaði, Þorgerðr Hölgabrúðr and Irpa (Old Norse: literally “Þorgerðr, Hǫlgi’s bride”), and Menglöð all serve as her handmaidens. 

Her name is often translated into English as Freya when used nowadays, but the original Norwegian name is spelt Freyja.
Receiver of the slain
The Valkyries, having chosen who is to live and die in battle, collect the souls of those slain and bring them to Valhalla, where they will feast and make revelry with Odin; Freyja herself shares half of these heroes with Odin. Her sacred realm is the field of Fólkvangr, wherein lies her great hall Sessrúmnir. There, Freyja decides where her warriors shall sit.

This is what is written in the original myth:

The ninth hall is Folkvang, where bright Freyja decides

Where her warriors shall sit,

Some of the slain belong to her,

Some belong to Odin.

Bride of the Odr
Freyja married a god called Óðr. She loves her husband deeply, but he often went away on long journeys, and Freyja cried red golden tears for him. Her tears become gold and amber when they fall to Earth, therefore gold was called "Freyja's tears". They have two beautiful daughters called Hnoss and Gersemi.
Owner of Brisingamen
Freyja often rides in a chariot pulled by big silver tabby cats (her sacred animal) or on a golden boar named Hildisvíni, who accompanies her in battle. Freyja was renowned for her loveliness and beauty, as the myths tell of three giants who wanted to marry her, but they were all killed by Thor, the god of thunder.

Freyja also has a precious necklace called Brísingamen. The god Loki once stole this necklace, and Freyja had to ask the guardian Heimdall for help. Heimdallr engaged Loki in combat and won against the Trickster, giving the necklace back to Freyja. For this, Loki is also called "Thief of Brisingamen", and Heimdall is also called "Seeker of Brisingamen".
Jobs
Freyja is a warrior goddess. Whenever she rides into battles, she gets half of the souls of dead heroes. She is also a practitioner of magic, otherwise known as seiðr, and is highly proficient in using it. She has a magical cloak made of falcon feathers which allows her to fly between different worlds.

Freyja is the patron goddess of crops and childbirths. She is also a goddess of love, whom lovers may send prayers to.

Frigg and Freyja were two of the most revered goddesses in Norse mythology. They were especially worshipped by Vikings. Freyja is said to be the kindest among goddesses. In a poem in the Poetic Edda, a young man called Ottar always trusted in the goddesses; he built a rock shrine for the goddesses, and Freyja answered his prayers. She disguised Ottar as her golden boar, and went on a trip to help him find his ancestors.

After Ragnarok
In final battle of Ragnarök, Odin, and Freyr will die. Freyja is not stated as having died during Ragnarök or surviving.
Names
Freyr's name means "the Lord", and Freyja's name means "the Lady".

The day of the week, Friday, is named either after her, or after Odin's wife Frigg.  Before Christianity became the dominant religion of the region, the Orion constellation was called Frigg's distaff or Freyja's girdle. Frigg and Freyja may be one and the same goddess.

Freyja is also widely known as Vanadis (Old Norse: Vanadís - "Lady of the Vanir"). The metallic element Vanadium was named after her. The Vanir are close relatives of elves. Freyr is the Lord of the elves, and his sacred realm is Alfheim, home of the elves.

Another well-known name of Freyja is Gefn, which means "Giver", a suitable name for the fertility goddess.

Freyja represents the Norse women of the Viking Age, whose husbands often went away to war. From Freyja's name, noble Norse women were called Fru, and wives were called house-fru. Frau means "woman" in German.

Freya and Freja are now common Scandinavian female names.

Norse gods and goddesses
Frigg (or Frigga) is the goddess of marriage, family, and motherhood in Norse mythology. She is the wife of Odin (chief of the Æsir), by whom she is the mother of Baldr and Höðr, and stepmother of Thor (Odin's eldest son) and Víðarr. Ruling Asgard as queen alongside the All-Father, Frigg often dwells in the dense, foggy lands of Fensalir (Old Norse: “Halls of Fen”) when her husband is away on one of his quests for knowledge; additionally, she is the only one besides Odin permitted to sit on his throne Hliðskjálf, and look out across the Nine Realms. Serving as Frigg's attendants are Eir, the gods' doctor and goddess of healing, Hlín (a goddess of protection), Gná (a messenger goddess), and Fulla (a fertility goddess). It is unclear whether Frigg's companions and attendants are simply different aspects of Frigg herself (cf. avatar). 

Norse gods and goddesses
Origins 
Wallace was probably born around 1270-1272. Little is known about his birth or childhood. Exactly where and when Wallace was born is not very clear. Some people say he was born about 1272, but a book printed in the 16th century called History of William Wallace and Scottish Affairs says he was born in 1276. Tradition says he was born in Elderslie, near Paisley in Renfrewshire. There are links with Ayrshire as well, and it is not clear whether Wallace first fought the English in Ayrshire or Lanark. Tradition sees Wallace as a being a 'commoner', or normal person. Robert the Bruce, who also fought the English, was seen as being more noble. But this is not strictly true because Wallace's family were minor nobles.
The struggle 
King Edward offered Scotland a deal which allowed them to have a Scottish king so long as King Edward was still in charge. This required the Scottish nobles to kneel, and swear allegiance to his sovereignty. Wallace refused, and led the resistance which followed. A series of battles were fought:
Battle of Stirling Bridge, 11 September 1297: won by Wallace against a much larger force. In the six months following Stirling Bridge, Wallace led a raid into northern England. His intent was to take the battle to English soil to demonstrate to Edward that Scotland also had the power to inflict the same sort of damage south of the border.
Battle of Falkirk, 1 April 1298: won by Edward because of his army's heavy armour. Wallace escaped into the mountains to continue the fighting.
Capture and execution
Wallace evaded capture by the English until 5 August 1305 when John de Menteith, a Scottish knight loyal to Edward, turned Wallace over to English soldiers at Robroyston near Glasgow. Wallace was taken to London at Westminster Hall, where he was tried for treason. He replied to the charge, "I could not be a traitor to Edward, for I was never his subject". Wallace was however found guilty.
Notes 
A book called The Acts and Deeds of Sir William Wallace, Knight of Elderslie was written by a minstrel named Blind Harry in the 15th century. The book is written more like a story than a true version of his life, and has led to much of the legends around William Wallace. The film Braveheart is based on the novel.

A plaque stands in a wall of St Bartholomew's Hospital near the site of Wallace's execution at Smithfield. In 2002 William Wallace was ranked as number 48 of the 100 Greatest Britons in an extensive UK poll conducted by the BBC.

See also
 Joan of Arc (c. 14121431), a French military leader and martyr.

References 

 Peter Polack, Guerrilla Warfare; Kings of Revolution,Casemate,

1270s births
1305 deaths
Scottish nobility
People from Paisley, Renfrewshire
The Æsir (Old Norse: singular ǫ́ss or áss; feminine ásynja, plural ásynjur) are the principal group or tribe of deities in Norse mythology. Including Odin, Frigg, Thor, and Baldr, the Æsir reside in the realm of Asgard, at the top of Yggdrasil's highest branch. Alongside the Æsir exists a second family of gods known as the Vanir, who joined with the Æsir to form a single, unified pantheon after the devastating war between the two tribes of deities. The Vanir were native to Vanaheimr, the god Njörðr and his children, Freyr and Freyja chief among them. The Æsir gods were usually connected with power and war, while the Vanir were associated with fertility and nature.
Norse mythology
The things that happened between the Æsir and the Vanir are an interesting part of Norse mythology. While other cultures have had "elder" and "younger" generations of gods, as with the Titans and the Olympians of ancient Greece, the Æsir and Vanir were portrayed as contemporaries. The two tribes fought battles, concluded treaties, and exchanged hostages; Freyr and Freyja were said to be hostages. Some believe that events that occurred between the Æsir and Vanir were a reflection of events common between different Norse clans at the time.

The Æsir did not grow old, instead remaining young by eating the apples of Iðunn. While they did not age, they could be killed. It was said that most of them will die at Ragnarök.
List of Æsir 
 Baldr—God of light and radiance, he is the most beloved of the gods. He is the son of Odin and Frigg and younger brother of Thor.
 Frigg—Wife of Odin and goddess of marriage, she rules Asgard as queen alongside the All-Father.
 Heimdallr—Known as the All-Seeing, he is the guardian of the rainbow bridge Bifröst.
 Höðr—God of winter and darkness; a blind god, he is the son of Odin and Frigg.
 Iðunn—Goddess of youth, she was keeper of the apples that grant the gods their phenomenal longevity and youth.
 Loki—Though oftentimes referred to as the god of trickery and mischief, Loki is not counted among the Æsir. The son of the (female) jötunn Laufey and Fárbauti (Old Norse: “cruel striker”), he is Odin’s blood brother.
 Odin—God of wisdom, poetry and war, he is chief of the Æsir and ruler of Asgard.
 Sif—Goddess of agriculture and fertility, she is the beloved wife of Thor, known across the Nine Worlds for her golden hair, which was sheared by Loki.
Thor—God of thunder and lightning, he is Asgard's greatest champion. He is the eldest son of Odin, born to him by Jörð, the personification of the Earth.
 Týr—God of law and heroic glory, he is one-handed. Either the son of Odin or the jǫtnar Hymir and Hroðr (Old Norse: “famed”).
 Ullr—God of the hunt and archery, he is the son of Sif and Thor's stepson.
 Viðarr—God of vengeance, he is the son of Odin and the female jötunn Gríðr.
Other websites 
 W. Wagner's "Asgard and the Home of the Gods" e-book 
 Peter Andreas Munch's "Norse Mythology: Legends of Gods and Heroes" e-book 

Norse gods and goddesses