Monday, May 25, 2020

How Starfish See With Eyespots

Starfish, which are more scientifically known as sea stars,  dont have any visible body parts that look like eyes. So how do they see? While it may not look like starfish have eyes, they do, although theyre not like our eyes. A starfish has eyespots that cannot see much in the way of details but can detect light and dark. These eyespots are at the tip of each of the starfishs arms. That means that a 5-armed starfish has five eyespots, and a 40-armed starfish has 40! How to See a Starfishs Eyespots A starfishs eyespots lie underneath its skin, but you can see them. If you get a chance to gently hold a starfish, often it will tilt the end of its arms upward. Look at the very tip, and you might see a black  or red dot. Thats the eyespot. Cartoons that portray starfish with a face with eyes in the center of their body are therefore inaccurate. A starfish is actually looking at you with its arms, not from the center of its body. Its just easier for cartoonists to portray them that way. Structure of the Sea Star Eye The eye of a sea star is very small. On a blue star, they are only about half a millimeter wide. They have a groove on the underside of each arm that has the tube feet that stars use to move. The eye is made of a couple hundred light-collecting units and is located at the end of one of the tube feet on each arm. It is a compound eye like that of an insect, but it doesnt have a lens to focus the light. This reduces its ability to see anything but light, dark, and large structures such as the coral reef it needs to live on. What Sea Stars Can See Sea stars cant detect color. They dont have the color-detecting cones that human eyes do, so they are colorblind and see only light and dark. They also cant see fast-moving objects as their eyes work slowly. If something swims by them fast, they simply wont detect it. They cant see any details because they have so few light-detecting cells. Experiments have shown they can detect large structures, and even that was a surprise for scientists, who for a long time thought they could only see light and dark. Each eye of the sea star has a large field of vision. If all of their eyes werent blocked, they could see for 360 degrees around themselves. They could probably limit their field of vision using their other tube feet on each arm as blinders. Sea stars likely see just enough to be able to get to where they want to be, on a rock or coral reef where they can feed.

Friday, May 15, 2020

Battle of Hattin in the Crusades

The Battle of Hattin was fought July 4, 1187, during the Crusades. In 1187, after a series of disputes, the Ayyubid armies of Saladin commenced moving against the Crusader states including the Kingdom of Jerusalem. Meeting the Crusader army west of Tiberias on July 3, Saladin engaged in a running battle as it moved towards the town. Surrounded during the night, the Crusaders, who were short on water, were unable to break out. In the resulting fight, the bulk of their army was destroyed or captured. Saladins victory opened the way for the recapture of Jerusalem later that year. Fast Facts: Battle of Hattin Conflict: The CrusadesDates: July 4, 1187Armies Commanders:CrusadersGuy of LusignanRaymond III of TripoliGerard de RidefordBalian of IbelinRaynald of Chatillonapprox. 20,000 menAyyubidsSaladinapprox. 20,000-30,000 men Background During the 1170s, Saladin began expanding his power from Egypt and worked to unite the Muslim states surrounding the Holy Land. This resulted in the Kingdom of Jerusalem being encircled by a unified enemy for the first time in its history. Attacking the Crusader state in 1177, Saladin was engaged by Baldwin IV at the Battle of Montgisard. The resulting fight saw Baldwin, who was suffering from leprosy, lead a charge that shattered Saladins center and put the Ayyubids to rout. In the wake of the battle, an uneasy truce existed between the two sides. Succession Issues Following Baldwins death in 1185, his nephew Baldwin V assumed the throne.  Only a child, his reign proved brief as he died a year later. As the Muslim states in the region were uniting, there was increasing dissension in Jerusalem with the elevation of Guy of Lusignan to the throne. Claiming the throne through his marriage to Sibylla, mother of the late child-king Baldwin V, Guys ascension was supported by Raynald of Chatillon and the military orders such as the Knights Templar.   Known as the court faction, they were opposed by the nobles faction. This group was led by Raymond III of Tripoli, who had been Baldwin Vs regent,  and who were angered by the move. Tensions quickly escalated between the two parties and civil war loomed as Raymond left the city and rode to Tiberias.  Civil war loomed as Guy considered besieging Tiberias and  was only avoided through mediation by Balian of Ibelin. Despite this, Guys situation remained tenuous as Raynald repeatedly violated the truce with Saladin by attacking Muslim trade caravans in Oultrejordain and threatening to march on Mecca. This came to a head when his men assaulted a large caravan traveling north from Cairo. In the fighting, his troops killed many of the guards, captured the merchants, and stole the goods. Operating within in the terms of the truce, Saladin sent envoys to Guy seeking compensation and redress. Reliant on Raynald to maintain his power, Guy, who conceded that they were in the right, was forced to send them away unsatisfied, despite knowing that it would mean war. To the north, Raymond elected to conclude a separate peace with Saladin to protect his lands. Saladin on the Move This deal backfired when Saladin requested permission for his son, Al-Afdal, to lead a force through Raymonds lands. Compelled to allow this, Raymond saw Al-Afdals men enter Galilee and meet a Crusader force at Cresson on May 1. In the battle that ensured, the outnumbered Crusader force, led by  Gerard de Ridefort, was effectively destroyed with only three men surviving.  In the wake of the defeat, Raymond left Tiberias and rode to Jerusalem. Calling his allies to assemble, Guy hoped to strike before Saladin could invade in force. Renouncing his treaty with Saladin, Raymond fully reconciled with Guy and a Crusader army of around 20,000 men formed near Acre. This included a mix a of knights and light cavalry as well as around 10,000 infantry along with mercenaries and crossbowmen from the Italian merchant fleet. Advancing, they occupied a strong position near the springs at Sephoria. Possessing a force nearly the size of Saladins, the Crusaders had defeated earlier invasions by holding strong positions with reliable water sources while allowing the heat to cripple the enemy (Map). Saladins Plan Aware of past failings, Saladin sought to lure Guys army away from Sephoria so that it could be defeated in open battle. To accomplish this, he personally led an attack against Raymonds fortress at Tiberias on July 2 while his main army remained at Kafr Sabt. This saw his men quickly penetrate the fortress and trap Raymonds wife, Eschiva, in the citadel. That night, the Crusader leaders held a war council to determine their course of action. While the majority was for pressing on to Tiberias, Raymond argued for remaining in the position at Sephoria, even if it meant losing his fortress. Though the precise details of this meeting are not known, it is believed that Gerard and Raynald argued strenuously for an advance and indicated that Raymonds suggestion that they hold their position was cowardly. Guy elected to push on in the morning. Marching out on July 3, the vanguard was led by Raymond, the main army by Guy, and the rearguard by Balian, Raynald, and the military orders. Moving slowly and under constant harassment by Saladins cavalry, they reached the springs at Turan (six miles away) around noon. Concentrating around the spring, the Crusaders eagerly took water. The Armies Meet Though Tiberias was still nine miles away, with no reliable water en route, Guy insisted on pressing on that afternoon. Under increasing attacks from Saladins men, the Crusaders reached a plain by the twin hills of the Horns of Hattin by mid-afternoon. Advancing with his main body, Saladin began attacking in force and ordered the wings of his army to sweep around the Crusaders. Attacking, they surrounded Guys thirsty men and cut off their line of retreat back to the springs at Turan. Realizing that it would be difficult to reach Tiberias, the Crusaders shifted their line of advance in an attempt to reach the springs at Hattin which were around six miles away. Under increasing pressure, the Crusader rearguard was forced to halt and give battle near the village of Meskana, stopping the entire armys advance. Though advised to fight on to reach water, Guy elected to halt the advance for the night. Surrounded by the enemy, the Crusader camp possessed a well but it was dry. Disaster Throughout the night, Saladins men taunted the Crusaders and set fire to the dry grass on the plain. The next morning, Guys army awoke to blinding smoke. This came from fires set by Saladins men to screen their actions and increase the Crusaders misery. With his men weakened and thirsty, Guy broke camp and ordered an advance towards the springs of Hattin. Despite having sufficient numbers to break through the Muslim lines, fatigue and thirst badly weakened the cohesion of the Crusader army. Advancing, the Crusaders were effectively counterattacked by Saladin. Two charges by Raymond saw him break through the enemy lines, but once outside the Muslim perimeter, he lacked enough men to influence the battle. As a result, he retreated from the field. Desperate for water, much of Guys infantry attempted a similar breakout, but failed. Forced onto the Horns of Hattin, the majority of this force was destroyed. Without infantry support, Guys trapped knights were unhorsed by Muslim archers and forced to fight on foot. Though fighting with determination, they were driven onto the Horns. After three charges against the Muslim lines failed, the survivors were forced to surrender. Aftermath Precise casualties for the battle are not known, but it resulted in the destruction of the majority of the Crusader army. Among those captured were Guy and Raynald. While the former was treated well, the latter was personally executed by Saladin for his past transgressions. Also lost in the fighting was a relic of the True Cross which was sent to Damascus. Quickly advancing in the wake of his victory, Saladin captured Acre, Nablus, Jaffa, Toron, Sidon, Beirut, and Ascalon in rapid succession. Moving against Jerusalem that September, it was surrendered by Balian on October 2. The defeat at Hattin and subsequent loss of Jerusalem led to the Third Crusade. Beginning in 1189, it saw troops under Richard the Lionheart, Frederick I Barbarossa, and Philip Augustus advance on the Holy Land.

Wednesday, May 6, 2020

Piaget s Theory Of Cognitive Development - 850 Words

Cognition is a complex idea, making it difficult to describe. Hooper and Umansky (p. 307, 2014) define cognitive development as an individual’s ability to translate objects and events into a symbolic form that can be stored in the brain. Cognition can be measured with perceptual and conceptual skills. Perceptual skills are the connection between the senses and experiences. Conceptual skills are higher level processing, such as, making decisions and problem solving (Hooper and Umansky, 2014). Piaget’s Theory of Cognitive Development and Vygotsky’s Sociocultural Theory are influential in our understanding of cognitive development for typical and atypical children. Piaget’s Theory of Cognitive Development suggests two stages of development, sensorimotor and preoperational thoughts. These two stages describe children to the age 7 or 8 years old (Hooper and Umansky, 2014). Sensorimotor period begins when the child is behaving in response to their environment. C hildren have little understanding to what is occurring. Children begin to develop natural responses to stimuli. Children recognize how he/she can cause events to happen (Hooper and Umansky, 2014). For example: a child can hit a button and the button makes a noise while a light flashes. The child now learns to receive the sensory stimulus he/she must hit the button. Object permanence is a significant change that occurs during the sensorimotor period. Object permanence takes place when the child acknowledges an objectShow MoreRelatedPiaget s Theory Of Cognitive Development1289 Words   |  6 Pagesare many great cognitive theorists, but the one that comes to mind is a development psychologist by the name of Jean Piaget. One of his prized declaration was in 1934, where he declared that education is capable of saving our society from collapsing whether its violent or gradual. Piaget had a key effect on education and psychology, and because of that effect he made many contributions to l earning and to cognition. One of most important contribution was a model that was made by Piaget. This modelRead MorePiaget s Cognitive Development Theory1077 Words   |  5 PagesAccording to Piaget (1957), cognitive development was a continuous restructuring of mental processes due to varied situations and experiencing the world and maturing biologically. His view of cognitive development would have us look inside a child’s head and glimpse the inborn process of change that thinking goes through. â€Å"He was mainly interested in the biological influences on â€Å"how we come to know’† (Huitt and Hummel, 2003). Piaget’s views helps us to have appropriate expectations about children’sRead MorePiaget s Theory Of Cognitive Development1813 Words   |  8 Pages ECH-130 Sociocultural Tables LLlllll Cognitive Development Definition Examples of Application of Concept Strategies to Support and/or Assess Learning Birth to Age 5/Pre-K Piaget Sensorimotor stage: :the first stage Piaget uses to define cognitive development. During this period, infants are busy discovering relationships between their bodies and the environment. Researchers have discovered that infants have relatively well developed sensory abilities An infant who recently learned how to rollRead MorePiaget s Cognitive Theory And Cognitive Development1494 Words   |  6 Pages 1) Examine how Piaget’s cognitive theory can help to explain the child’s behavior. Piaget confirms â€Å"Each cognitive stage represents a fundamentally new psychological reorganization resulting from maturation of new functions and abilities† (as in Greene, 2009, p.144). The case Vignette describes Victors’ stages of development through Piaget’s stages of cognitive development as exhibited behavior that occurred during the sensorimotor, preoperational, as established areas. Victor experienced a normalRead MorePiaget s Theory On Cognitive Development1449 Words   |  6 Pagesstrengths and weaknesses of Piaget’s theory on cognitive development. It will focus on Piaget’s work highlighting positive attributes and how they’re being applied in modern day and also delve on key limitations of the theory. Piaget was a Swiss psychologist who was interested on why children would give similar but wrong answers in an intelligence test (Vidal, 1994). Based on his observations, he concluded that children undergo sequential cognitive d evelopment patterns which occur in defined stagesRead MorePiaget s Theory Of Cognitive Development969 Words   |  4 Pages20th century, the development of psychology is constantly expanding. Erikson and Piaget are two of the ealier well known theorist, both being significant in the field. Their belief s are outlined in Piaget s Cognitive Development Theory and Erikson s Psychosocial Development Theory. These theories, both similar and different, have a certain significance as the stages are outlined.Erikson and Piaget were similar in their careers and made huge progressions in child development and education. WithRead MorePiaget s Theory Of Cognitive Development1519 Words   |  7 Pagesrelates to both Piaget and Vygotskian theories in the sense that they describe how the child s mind develops through different forms of stimuli that occur during early childhood. Piaget s theory focuses mainly on things such as; how children think; how the world around them is perceived and how th e newly found information is explained through the language they use. Vygotsky s theory however differs as the effects of different forms of social interaction occur in cognitive development such as; internalisation;Read MorePiaget s Theory Of Cognitive Development1111 Words   |  5 PagesPiaget’s theory of cognitive development Piaget’s theory of cognitive development was based around his belief that children will develop their intelligence through a series of stages: Sensorimotor (birth – 2yrs), Preoperational (2-7yrs), Concrete Operational (7-11yrs) and Formal Operational (11+). He believed these stages to be invariant, the same stages taking place in a fixed order, and universal, the same for every child regardless of their background or culture. (McLeod, 2015) Piaget believedRead MorePiaget s Theory Of Cognitive Development Essay1790 Words   |  8 PagesCognitive developmental theories provide a framework for understanding about how children act and perceive the world. However, every theory has both strengths and weaknesses. A certain theory may explain one aspect of cognitive development very well, but poorly address or completely ignore other aspects that are just as important. Two well known theories of cognitive development are Piaget’s stage theory and Vygotsky’s sociocultural theory. As I plan to be a pediatric nurse, these two theories willRead MorePiaget s Theory Of Cognitive Development1325 Words   |  6 PagesJean Piaget developed a systematic study of cognitive development. He conducted a theory that all children are born with a basic mental structure. He felt that their mental structure is genetically inherited and their learning evolved from subsequent learning and knowledge. Piaget’s theory is differ ent from other theories and he was the first to study a child’s learning by using a systematic study of cognitive development. His theory was only concerning the learning of children, their development

Tuesday, May 5, 2020

Auditing and Professional Practices Global Business Management

Question: Discuss about theAuditing and Professional Practicesfor Global Business Management. Answer: Auditing refers to the process of examining and verifying various accounts of a company. It is desired that the report of the auditors should reflect the true and actual financial position of the company as the investment decision is dependent on that report. In this process, the auditors need to be ethical and must comply with all the legal issues of the profession. The auditors need to be independent; and at the same time, they should keep in mind that the interest of the public is attached with the process. Hence, they should be ethical and must comply with all the rules and regulations of the audit profession (Salem 2012). As per the given case study, Games Limited was involved in some kind of corruption. The director of the company wants to remove the existing audit team and wants to recruit a new audit partner. The audit partner can accept the offer, but he should keep some facts in mind. One of the facts is that the new audit partner should be loyal to the profession and he will not go into any kind of illegal audit agreement with the director of the company. He should be neutral while auditing the accounts of the company and must provide the true financial reports (Everett and Tremblay 2014). He must comply with all the governmental rules and regulations of auditing. He must take all these above discussed aspects into consideration before taking the job for the company. References Everett, J. and Tremblay, M.S., 2014. Ethics and internal audit: Moral will and moral skill in a heteronomous field.Critical Perspectives on Accounting,25(3), pp.181-196. Salem, M.S., 2012. An overview of research on auditor's responsibility to detect fraud on financial statements.Journal of Global Business Management,8(2), p.218.