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Fetch (game)
Fetch is a pet game where an object, such as a stick or ball, is thrown a moderate distance away from the animal, and it is the animal's objective to grab and retrieve ("fetch") it. Many times, the owner of the animal will say "Fetch" to the animal before or after throwing the object. The game is usually played with a dog, but in rare instances cats, especially younger cats, have been known to engage in fetch behavior. Mathematics of Fetch Arizona State psychology professor Michael McBeath has proposed a simple model to explain how dogs play Fetch. By mounting a camera on the head of a dog, he found that the dog changed its speed and direction in order to keep the frisbee's image in a constant position on its retina. This approach, called the Linear Optical Trajectory, makes the frisbee appear to move in a linear path at a constant speed. McBeath had previously noticed this interception strategy in professional baseball players pursuing fly balls. Tim Pennings, a mathematics pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spot Fetcher
Spot "Spotty" Fetcher (March 17, 1989 – February 21, 2004) was U.S. President George W. Bush's dog. She was an English Springer Spaniel, named after Scott Fletcher, a baseball player with the Texas Rangers, a team George W. Bush owned before becoming Governor of Texas in 1994. Born in the White House, she was the daughter of Millie, who had belonged to President George H. W. Bush and First Lady Barbara Bush. Her father was Tug Farish from Lane's End Farm in Kentucky, better known for its thoroughbred horse breeding program. She was euthanized after suffering a series of strokes. She was 14 years old.Mike Allen"A Dog's Life Remembered: Spot Is Dead At Age 14"''The Washington Post'', February 22, 2004, p. D1 See also *United States presidential pets *List of individual dogs References External links Whitehouse.gov biography of Spot Fetcher(archived at the Internet Archive The Internet Archive is an American digital library with the stated mission of "universal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kitten
A kitten is a juvenile cat. After being born, kittens display primary altriciality and are totally dependent on their mothers for survival. They normally do not open their eyes for seven to ten days. After about two weeks, kittens develop quickly and begin to explore the world outside their nest. After a further three to four weeks, they begin to eat solid food and grow baby teeth. Domestic kittens are highly social animals and usually enjoy human companionship. Etymology The word "kitten" derives from the Middle English word , which in turn came from the Old French or . Juvenile big cats are called "cubs" rather than kittens; either term (but usually more commonly "kitten") may be used for the young of smaller wild felids, such as ocelots, caracals, and lynxes. Development A feline litter usually consists of two to five kittens, but litters with one to more than ten are known. Kittens are typically born after a gestation lasting between 64 and 67 days, with an average l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spaniel Fetching
A spaniel is a type of gun dog. Spaniels were especially bred to flush game out of denser brush. By the late 17th century, spaniels had been specialized into water and land breeds. The extinct English Water Spaniel was used to retrieve water fowl shot down with arrows. Land spaniels were setting spaniels—those that crept forward and pointed their game, allowing hunters to ensnare them with nets, and springing spaniels—those that sprang pheasants and partridges for hunting with falcons, rabbits and smaller mammals such as rats and mice for hunting with greyhounds. During the 17th century, the role of the spaniel dramatically changed as Englishmen began hunting with flintlocks for wing shooting. Charles Goodall and Julia Gasow (1984) write that spaniels were "transformed from untrained, wild beaters, to smooth, polished gun dogs." The word "spaniel" would seem to be derived from the medieval French ''espaigneul''"Spanish"to modern French, ''espagnol''. Definition and descr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arizona State University
Arizona State University (Arizona State or ASU) is a public research university in the Phoenix metropolitan area. Founded in 1885 by the 13th Arizona Territorial Legislature, ASU is one of the largest public universities by enrollment in the U.S. One of three universities governed by the Arizona Board of Regents, ASU is a member of the Universities Research Association and classified among "R1: Doctoral Universities – Very High Research Activity". ASU has nearly 150,000 students attending classes, with more than 38,000 students attending online, and 90,000 undergraduates and nearly 20,000 postgraduates across its five campuses and four regional learning centers throughout Arizona. ASU offers 350 degree options from its 17 colleges and more than 170 cross-discipline centers and institutes for undergraduates students, as well as more than 400 graduate degree and certificate programs. The Arizona State Sun Devils compete in 26 varsity-level sports in the NCAA Division I Pac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hope College
Hope College is a private Christian liberal arts college in Holland, Michigan. It was originally opened in 1851 as the Pioneer School by Dutch immigrants four years after the community was first settled. The first freshman college class matriculated in 1862 and Hope received its state charter in 1866. Hope College is affiliated with the Reformed Church in America and retains a Christian atmosphere. Its campus is adjacent to the downtown commercial district and has been shared with Western Theological Seminary since 1884. History Hope's motto is taken from Psalm 42:6: "Spera in Deo" ("Hope in God"). The college's emblem is an anchor. This is drawn from a speech by Albertus van Raalte, the leader of the community, on the occasion of the founding of the Pioneer School in 1851: "This is my anchor of hope for this people in the future," (an allusion to Hebrews 6:19). The primary-level Pioneer School was later expanded to secondary and college-level education as Hope College. Van V ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Welsh Corgi
The Welsh Corgi ( or Corgi, plural Corgis, or occasionally the etymologically consistent Corgwn; ) is a small type of herding dog that originated in Wales. The name ''corgi'' is derived from the Welsh words and (which is mutated to ), meaning "dwarf" and "dog", respectively. Two separate breeds are recognized: the Pembroke Welsh Corgi and the Cardigan Welsh Corgi. Physical differences are seen between the two breeds. According to the breed standards, overall the Cardigan is larger, both in weight and height. Their tails are of different shapes, and docking was previously performed on Corgis before the practice was largely banned. Historically, the Pembroke has been attributed to the influx of dogs alongside Flemish weavers from around the 10th century, while the Cardigan is attributed to the dogs brought with Norse settlers, in particular a common ancestor of the Swedish Vallhund. The Pembroke is the more popular of the two, yet still appears on the Kennel Club's vulner ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calculus
Calculus, originally called infinitesimal calculus or "the calculus of infinitesimals", is the mathematical study of continuous change, in the same way that geometry is the study of shape, and algebra is the study of generalizations of arithmetic operations. It has two major branches, differential calculus and integral calculus; the former concerns instantaneous Rate of change (mathematics), rates of change, and the slopes of curves, while the latter concerns accumulation of quantities, and areas under or between curves. These two branches are related to each other by the fundamental theorem of calculus, and they make use of the fundamental notions of convergence (mathematics), convergence of infinite sequences and Series (mathematics), infinite series to a well-defined limit (mathematics), limit. Infinitesimal calculus was developed independently in the late 17th century by Isaac Newton and Gottfried Wilhelm Leibniz. Later work, including (ε, δ)-definition of limit, codify ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Least Time Principle
Fermat's principle, also known as the principle of least time, is the link between ray optics and wave optics. In its original "strong" form, Fermat's principle states that the path taken by a ray between two given points is the path that can be traveled in the least time. In order to be true in all cases, this statement must be weakened by replacing the "least" time with a time that is " stationary" with respect to variations of the path — so that a deviation in the path causes, at most, a ''second-order'' change in the traversal time. To put it loosely, a ray path is surrounded by close paths that can be traversed in ''very'' close times. It can be shown that this technical definition corresponds to more intuitive notions of a ray, such as a line of sight or the path of a narrow beam. First proposed by the French mathematician Pierre de Fermat in 1662, as a means of explaining the ordinary law of refraction of light (Fig.1), Fermat's principle was initiall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dog Training And Behavior
The dog (''Canis familiaris'' or ''Canis lupus familiaris'') is a domesticated descendant of the wolf. Also called the domestic dog, it is derived from the extinct Pleistocene wolf, and the modern wolf is the dog's nearest living relative. Dogs were the first species to be domesticated by hunter-gatherers over 15,000 years ago before the development of agriculture. Due to their long association with humans, dogs have expanded to a large number of domestic individuals and gained the ability to thrive on a starch-rich diet that would be inadequate for other canids. The dog has been selectively bred over millennia for various behaviors, sensory capabilities, and physical attributes. Dog breeds vary widely in shape, size, and color. They perform many roles for humans, such as hunting, herding, pulling loads, protection, assisting police and the military, companionship, therapy, and aiding disabled people. Over the millennia, dogs became uniquely adapted to human behavior, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
