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.
Laserdisc
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.
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.
Californium
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.
When californium is used, workers must be protected from the element's ability to disrupt the formation of red blood cells.
Torgau
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.
Chemical bond
Chemical bonds are what joins atoms together. 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
Physical property
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".
Concept
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".
Kenpo
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.
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.
Kempo has a very strong presence in Hawaii, the home base for many of the systems under Kempo that exist today in the United States. Throughout each of the histories of the different groups there are strong signs of the continued merging of both Chinese and Japanese influences.
Edge
Edge can mean:
Tyr
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.
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 God's 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 , the guard dog of Hel.
Loki