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The Serengeti ecosystem is a geographical region in Africa, spanning northern Tanzania and some of southwestern Kenya. The protected area within the region includes 30,000 km2 of land, including the Serengeti National Park and several game reserves; the Serengeti hosts the second largest terrestrial mammal migration in the world, which helps secure it as one of the Seven Natural Wonders of Africa, as one of the ten natural travel wonders of the world. The Serengeti is renowned for its large lion population and is one of the best places to observe prides in their natural environment. 70 large mammal and 500 bird species are found there. This high diversity is a function of diverse habitats, including riverine forests, kopjes and woodlands. Blue wildebeests, gazelles and buffalos are some of the found large mammals in the region; the Serengeti contains the Serengeti District of Tanzania. There has been controversy about a proposal to build a road through the Serengeti; the name "Serengeti" is said to be derived from the word from "seringit" in the Maasai language, meaning "endless plains".

However, this etymology does not appear in Maa dictionaries. Much of the Serengeti was known to outsiders as Maasailand; the Maasai are known as fierce warriors and live alongside most wild animals with an aversion to eating game and birds, subsisting on their cattle. Their strength and reputation kept the newly arrived Europeans from exploiting the animals and resources of most of their land. A rinderpest epidemic and drought during the 1890s reduced the numbers of both Maasai and animal populations; the Tanzanian government in the 20th century re-settled the Maasai around the Ngorongoro Crater. Poaching and the absence of fires, the result of human activity, set the stage for the development of dense woodlands and thickets over the next 30–50 years. Tsetse fly populations now prevented any significant human settlement in the area. By the mid-1970s, wildebeest and the Cape buffalo populations had recovered and were cropping the grass, reducing the amount of fuel available for fires; the reduced intensity of fires has allowed acacia to once again become established.

In the 21st century, mass rabies vaccination programmes for domestic dogs in the Serengeti have not only indirectly prevented hundreds of human deaths, but protected wildlife species such as the endangered African wild dog. Each year around the same time, the circular great wildebeest migration begins in the Ngorongoro Conservation Area of the southern Serengeti in Tanzania and loops in a clockwise direction through the Serengeti National Park and north towards the Masai Mara reserve in Kenya; this migration is a natural phenomenon determined by the availability of grazing. The initial phase lasts from January to March, when the calving season begins – a time when there is plenty of rain-ripened grass available for the 260,000 zebra that precede 1.7 million wildebeest and the following hundreds of thousands of other plains game, including around 470,000 gazelles. During February, the wildebeest spend their time on the short grass plains of the southeastern part of the ecosystem and giving birth to 500,000 calves within a 2 to 3-week period.

Few calves are born ahead of time and of these, hardly any survive. The main reason is that young calves are more noticeable to predators when mixed with older calves from the previous year; as the rains end in May, the animals start moving northwest into the areas around the Grumeti River, where they remain until late June. The crossings of the Grumeti and Mara rivers beginning in July are a popular safari attraction because crocodiles are lying in wait; the herds arrive in Kenya in late July / August, where they stay for the remainder of the dry season, except that the Thomson's and Grant's gazelles move only east/west. In early November, with the start of the short rains the migration starts moving south again, to the short grass plains of the southeast arriving in December in plenty of time for calving in February. About 250,000 wildebeest die during the journey from Tanzania to the Maasai Mara National Reserve in southwestern Kenya, a total of 800 kilometres. Death is from thirst, exhaustion, or predation.

The Serengeti has some of East Africa's finest game areas. Besides being known for the great migration, the Serengeti is famous for its abundant large predators; the ecosystem is home to over 3,000 lions, 1,000 leopards, 7,700 to 8,700 spotted hyenas.. The East African cheetah are present in Serengeti. Wild dogs are scarce in much of the Serengeti; this is true in places such as Serengeti National Park, in which lions and spotted hyenas, predators that steal wild dog kills and are a direct cause of wild dog mortality, are abundant. The Serengeti is home to a diversity of grazers, including African buffalo, Grant's gazelle, eland and topi; the Serengeti can support this remarkable variety of grazers only because each species those that are related, has a different diet. For example, wildebeests prefer to consume shorter grasses. Dik-diks eat the lowest leaves of a tree, impalas eat the leaves that are higher up, giraffes eat leaves that are higher; the governments of Tanzania and Kenya maintain a number of protected areas, including national parks, conservation areas, game reserves, that give legal protection to over 80 percent of the Serengeti.

The southeastern area lies in the rain shadow of the Ngorongoro

Margie Gillis

Margie Gillis is a Canadian dancer and choreographer. Gillis has been creating original works of modern dance for over thirty-five years, her repertoire includes more than one hundred pieces, which she performs as solos and group pieces. Gillis was born in Montreal, the daughter of Gene Gillis, an Olympic skier, Rhona Wurtele, a Canadian Olympic skier, her brother Jere Gillis played professional hockey. Her other brother Christopher Gillis was a professional dancer and choreographer who danced with her since childhood and collaborated on numerous shows. Showing a passion for dance early in life, she began ballet and gymnastic lessons at the age of three. In her youth, she trained and rehearsed on her own and continued to learn in classes with teachers such as May O'Donnell, Linda Rabin, Lynda Raino and Allan Wayne. In 1981, Gillis founded her own company, the Margie Gillis Dance Foundation with the mission to support and present her artistic work; these works have toured to Asia, India and the Middle East as well as across North and South America.

She was the first performer to take Western modern dance to China in 1979. During the summer months, Gillis teaches two one-week dance retreats at HollyHock, a centre on Cortes Island, British Columbia. Gillis is a committed artist, she has been spokesperson for a number of organizations dedicated to the fight against AIDS as well as for OXFAM and the Planned Parenthood Foundation. Gillis has received numerous recognitions throughout her career, she is an Honorary Cultural Ambassador for both the Canadian governments. In 1987, she was the first modern dance artist. In 2001, she received a Career Grant from the Conseil des arts et des lettres du Québec for her exceptional contribution to Quebec culture. In the fall of 2008, Gillis was chosen by the Stella Adler Studio of Acting in New York City, New York, to receive its first MAD Spirit Award for her involvement in various social causes, she was awarded the Walter Carsen Prize for Excellence in the Performing Arts by a jury of her peers at the Canada Council for the Arts.

In 2009, she was made a Knight of the National Order of Quebec. On March 3, 2011, Gillis was named a 2011 laureate of the Governor General's Performing Arts Awards for Lifetime Artistic Achievement. In May 2011, she received the Lifetime Artistic Achievement Award from the Governor General’s Performing Arts Award. In 2013, Gillis was promoted from her 1987 Order of Canada and appointed an Officer of the Order of Canada; this honour recognizes a lifetime of achievement and merit of a high degree in service to Canada or to humanity at large. List of choreographers List of dancers List of people from Montreal Official website Margie Gillis at The Canadian Encyclopedia

National Register of Historic Places listings in Rock Hill, South Carolina

This is a list of the National Register of Historic Places listings in Rock Hill, South Carolina. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Rock Hill, South Carolina, United States; the locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen on a map. There are 55 districts listed on the National Register in York County; the city of Rock Hill is the location of 26 of these properties and districts, they are listed here, while the 29 properties and districts in the remaining parts of the county are listed separately. This National Park Service list is complete through NPS recent listings posted February 28, 2020

Wesley Addy

Robert Wesley Addy was an American actor of stage and film. Addy was born in Omaha, the son of Maren S. and John R. Addy, he was an economics major at the University of California, Los Angeles, he served in the United States Army during World War II. Addy's debut in acting came at Martha's Vineyard, he played many roles on the Broadway stage, including several Shakespearean ones opposite actor Maurice Evans. After playing two roles in one of Evans's productions of Hamlet, he played Horatio opposite Evans's Hamlet in a 1953 Hallmark Hall of Fame television production of the work, the most prestigious American production of the play seen on television up to that time. On television he played roles on The Edge of Night in the 1950s, he made two guest appearances on Perry Mason: Alton Brent in the 1962 episode, "The Case of the Weary Watchdog", murderer Joachim DeVry in the 1966 episode, "The Case of the Tsarina's Tiara." During the 1970s-1980s, he played publisher Bill Woodard on Ryan's Hope and patriarch Cabot Alden on the Agnes Nixon-Douglas Marland serial Loving.

His television career includes guest appearances on The Defenders, The Outer Limits, The Fugitive and The Rockford Files. In motion pictures, Addy's career spanned four decades. Robert Aldrich used him as supporting actor in several pictures, such as Kiss Me Deadly, The Big Knife, What Ever Happened to Baby Jane?, Hush... Hush, Sweet Charlotte and The Grissom Gang. In 1976, Addy appeared in Paddy Chayefsky's Network, directed by Sidney Lumet, they would work together again in The Verdict, in which Addy played a doctor who nearly derails Paul Newman's case against a hospital for malpractice. Another of Addy's best-remembered roles was that of Lt. Commander Alvin Kramer, who unsuccessfully tries to warn American officials of the impending attack on Pearl Harbor in Tora! Tora! Tora!. Addy died at Danbury Hospital in Connecticut, he was married to actress Celeste Holm from 1966 until his death. The couple lived in Morris County, New Jersey. Wesley Addy on IMDb Wesley Addy at the Internet Broadway Database Wesley Addy at the Internet Off-Broadway Database Wesley Addy at AllMovie


Receptor-type tyrosine-protein phosphatase zeta known as phosphacan is an enzyme that in humans is encoded by the PTPRZ1 gene. This gene is a member of the receptor tyrosine phosphatase family and encodes a single-pass type I membrane protein with two cytoplasmic tyrosine-protein phosphatase domains, an alpha-carbonic anhydrase domain and a fibronectin type III domain. Alternative splice variants that encode different protein isoforms have been described but their full-length nature has not been determined. Expression of this gene is induced in gastric cancer cells, in the remyelinating oligodendrocytes of multiple sclerosis lesions, in human embryonic kidney cells under hypoxic conditions. Both the protein and transcript are overexpressed in glioblastoma cells, promoting their haptotactic migration

MDA Space Missions

MDA's Robotics and Automation is a Canadian manufacturer subsidiary of MacDonald and Associates Ltd.. It specialized in the manufacture of robotic arms and equipment for space applications, most notably the Canadarm on the space shuttle orbiters, Canadarm-2 on the International Space Station. In addition to design, safety and quality assurance engineering services, MDA's previous contracted products include: Canadarm Canadarm2 for the International Space Station RADARSAT-1, the first commercial radar earth observation satellite RADARSAT-2, the world's most advanced civilian radar earth observation satellite Special Purpose Dexterous Manipulator known as "Dextre" or the "Canada Arm" The robotic arm and weather station on Phoenix mission to Mars