Southern Bantu languages
The Southern Bantu languages, also known as Bantu zone S, are a group of languages in the Bantu language family. It was first described by Malcolm Guthrie in 1948. Guthrie's divisions of the Bantu languages were based on geography, not on language characteristics. The Southern Bantu languages, however, are also a valid linguistic group.
The Southern Bantu languages are a group of languages in the Niger-Congo language superfamily. The group includes all of the important Bantu languages of South Africa, Zimbabwe, and Botswana. It also includes some important languages of southern Mozambique.
The Southern Bantu language group includes six sub-groups of languages:
Estelle Yancey
Estelle "Mama" Yancey (January 1, 1896–April 19, 1986) was an American blues singer. She was the wife of pianist Jimmy Yancey. She recorded often with her husband.
Yancey, born Estelle Harris, grew up in Chicago, where she sang in church choirs and learned how to play the guitar. In 1917, when she was 21, she married Jimmy Yancey. She often sang with him at meetings and house parties in the 1930s and 1940s and performed with him at Carnegie Hall, New York in 1948. Because Jimmy Yancey was a great boogie-woogie/blues piano player, but a poor singer, Estelle recorded frequently with her husband. In 1943, the Yanceys recorded for Session Records, and went back into the studio to record the album "Pure Blues" for Atlantic Records. The session was just a few months before Jimmy Yancey's death that same year.
Estelle continued to perform and record. Mama Yancey's recordings with other pianists include "South Side Blues" for the Riverside label (1961), some records with Art Hodes for Verve Records in 1965, and "Maybe I'll Cry" with Erwin Helfer for the Red Beans label in 1983, recorded at age 87.
Estelle Yancey died April 19, 1986 in Chicago, Illinois.
George &quot;Harmonica&quot; Smith
George "Harmonica" Smith (born April 22, 1924 in West Helena, Arkansas; died October 2, 1983 in Los Angeles, California ) (born Allen George Smith) was an American blues harmonica player.
Born in West Helena, Arkansas he was brought up in Cairo, Illinois.He began playing professionally in 1951. He joined Muddy Waters' band in 1954. He was again member of the band in 1966.He left Chicago and spent much of his adult life on the West Coast.
Smith played with the blues combo, Bacon Fat, and mentored its harmonica player Rod Piazza. After this he played harmonica for Big Mama Thornton in the 1970s. He appeared on her album "Jail" (1975).Another student of him was William Clarke.
On the few solo albums he recorded one can hear the influence of Little Walter on his harmonica playing.George "Harmonica" Smith died in 1983, in Los Angeles, California at the age of 59.
Rochester, Minnesota
Rochester is a city in southeast Minnesota. It is Minnesota's third largest city, with about 115,700 people as of 2017. The Mayo Clinic is there. It was named after Rochester, New York.
On August 21, 1883, a strong tornado severely damaged much of the city. Almost 40 people were killed by the tornado.
Uchiwa
Uchiwa is a traditional Japanese fan. It is often used to create a breeze to keep cool in hot weather. They are part of Japanese seasonal traditions and are often given as gifts during these times. Originally, uchiwa were made from big leaves and animal hair. The purpose was to purify and pray. Over time they have changed, and are now made from bamboo and paper. There are many kinds of pattern; during the Han Dynasty they were often decorated by famous calligraphers. During the Edo period they were made as souvenirs for shrines. During the Meiji period they were admired by foreigners and imported to other countries.
The oldest uchiwa can be seen in the records of ancient China, as well as the wall paintings of Ancient Egypt. By the end of the Kōan (Muromachi period) period, uchiwa was made from bamboo and paper.
Uchiwa is used to fan cooking and to keep cool. Some people use it to purify disease. Uchiwa is almost always used in summer festival dances.
Alessandro Matri
Alessandro Matri (born 19 August 1984) is an Italian football player. He plays for Brescia (on loan from Sassuolo) and Italy national team.
Fabio Quagliarella
Fabio Quagliarella (born 31 January 1983) is an Italian professional football player. He plays for and captains U.C. Sampdoria and Italy national team.
Expedition
An expedition usually means a long journey or voyage done for a specific purpose, often exploratory, scientific, geographic, military or political in nature.
Secret sharing
Secret sharing is used as a term to refer to ways of sharing a secret among many people. Each person knows part of the secret that is shared, but a number of people need to cooperate to rebuild the secret. The knowledge of one person alone is not enough to reconstruct the secret. Adi Shamir and George Blakley developed the method independently of each other, in 1979.
One example where secret sharing is used is the RSA cryptosystem. It uses a "secret key". If this key is distributed among many people, no single person can make a signature. Even if the part of one person is revealed or lost, a number of them can still make a signature. This is often used is areas where security is very important, such as banks, or the military.
The dealer hands each player their part of the secret. In an easier setup, the parts of the players can be combined to form the secret, but with each part there is extra information. Say that a secret needs five parts, and three parts are known. In this setup, guessing the two parts that are missing will be easier than guessing the secret awhen no parts are known. The other setup is said to be secure from the point of view of information theory, because knowing part of the required number of player parts will not change how difficult it is to guess the secret.
There are different methods of secure secret sharing techniques.
In this method, any t out of the n shares may be used to recover the secret. The idea is that a polynomial of degree t-1 is defined by t points on the polynomial: It takes two points to define a straight line, three to define a quadratic curve, four for a cubic, and so on. It takes t points ot define a polynomial of degree t-1. That way it is possible to build a polynomial, the first coefficient is the secret; there are n randomly picked coefficients. Each player receives one of the n coefficients. If there are at least t players, they can rebuild the original curve, and get the secret.
Zero-knowledge proof
A zero-knowledge proof or zero-knowledge protocol is a protocol used in cryptography. In such a protocol, two parties are communicating. The task of one party is to convince the other that it knows some secret, but without revealing the secret.
There is a well-known story showing some of the ideas of zero-knowledge proofs. Usually, the two parties in a zero-knowledge proof are called Peggy (the prover of the statement) and Victor (the verifier of the statement).
In this story, Peggy has uncovered the secret word used to open a magic door in a cave. The cave is shaped like a circle, with the entrance on one side and the magic door blocking the opposite side. Victor says he'll pay her for the secret, but not until he's sure that she really knows it. Peggy says she'll tell him the secret, but not until she receives the money. They devise a scheme by which Peggy can prove that she knows the word without telling it to Victor.
First, Victor waits outside the cave as Peggy goes in. They label the left and right paths from the entrance A and B. Peggy randomly takes either path A or B. Then, Victor enters the cave and shouts the name of the path he wants her to use to return, either A or B, chosen at random. Providing she really does know the magic word, this is easy: she opens the door, if necessary, and returns along the desired path. Note that Victor does not know which path she has gone down.