Us history Essay Example | Topics and Well Written Essays - 500 words

Us history - Essay Example Harry Truman’s strategy ensured these ally countries were going to be unbeatable since they were better economies than that of USSR, eliminating its threat of being a superpower. This was the same idea that was used to win the cold war. The fight against rampant poverty that was in America then was the war Lyndon Johnson fought. The poverty that was in America was invisible; Lyndon Johnson used political rallies to express the fact that things had gone out of control, and, therefore, Americans should put its vision on helping people who are suffering, to help them, to give them education, opportunity, to give them the chance of coming into the mainstream of America’s middle class economic life. Everybody was meant to be a winner, from the poor to the rich. America grew less optimistic about the future of the society in the 1970s due to the increased inequality that was witnessed in the society decades after the end of the Second World War. This was seen in the absence of an increase in income since 1967, and people expected nothing since they had no increase in their income for the past ten years. Therefore, it created negative long-term expectations in relation to both family and individual lives and about the future of the United States and its economic perspective. The goals and tactics of the female were to ensure the women had equal rights with men. The main goal of the feminist movement was to eliminate discrimination against women and increase a woman’s part in the building of the nation. With the establishment of feminist movements, there was and has been a noticeable success; for instance, women were able to do jobs men did. They received equal salaries with men; women were involved in politics among other successful things involving women. Vietnam War made the American people lose trust in the president and the government because the

What was the role of Serbia in the events that led to the outbreak of Research Paper

What was the role of Serbia in the events that led to the outbreak of the First World War - Research Paper Example There were different factors such as imperialism, nationalism as well as the formation of different alliances between various countries which finally resulted into the emergence of war. The immediate causes of the war were even discussed during that era wherein major powers of the world at that time blamed each other for bringing the situation to a point where War broke out . (Taylor, 1980) Serbia was most instrumental and probably one of the key reasons as to why First World War took place. What role Serbia played in the outbreak of First World War therefore is an issue which attracted attention of many historians over the period of time. The assassination of Franz Ferdinand and the subsequent events which unfolded therefore gave rise to the need for developing broader understanding of the events which lead to war. Though the war started with the attack from Austria- Hungary on Serbia to potentially avenge the murder however, the overall political reasons for this war were much deeper. (Bourne, 1994) Before discussing the role of Serbia in the events which lead to the First World War, it is important that a general historical introduction of Serbia and its position before the war should be discussed. Serbia fell under the rule of Ottoman Empire in 16th century when it was conquered by Ottomans and were subsequently put under the rule for more than 300 years. The Ottoman conquest became possible due to the internal conflict within the Kingdom of Serbia and resultantly the State as a whole weakened. Serbia remained under the control of Ottoman Empire for more than 300 years and it was only in the beginning of the 20th century that it started to consider a separation from the empire and develop its own separate identity. It is also important to note that the organized revolt in Serbia against Ottoman Empire started during the 19th century and Serbia was able to free some area even during the 19th Century. It was

Importance of Tourism Ethics

Importance of Tourism Ethics The significant growth of tourism activity without a doubt marks tourism as one of the most notable economic and social occurrence of the past century. According to the World Tourism Organization (2005), the number of international arrivals shows a growth from a 25 million international arrivals in 1950 to over 700 million in 2002, matching to an average yearly growth rate of 6.6%. In addition to the statistical growth of tourism, there has been a change of the tourism product from the conventional sun, sea and sand to a product that would be more beneficial for those living in the tourism destination. Tourisms growth has meant the industry now stands for the foremost source of foreign exchange earnings in most countries (WTO, 2005). However, in addition to the often cited economic pointers displaying the control of the tourism industry, there has been a matching rise and recognition of the possible negative impacts of the growing tourism industry; this has led to calls for the indus try to exercise greater responsibility in order to protect various destinations (Archer et al., 2005). However, in the last few decades, responsible tourism has come into view as a wider consumer market trends towards lifestyle marketing and ethical consumption have spread to tourism (Goodwin, 2003). Tourism organizations are beginning to realise that promoting their ethical position can be good business as it has the ability to increase a companys profits, management effectiveness, public image and employee relations (Hudson and Miller, 2005). There has been not only a significant change in the products and patterns of tourism across the world over the past decade, but also an increasing concern with how it might contribute towards sustainable living, mainly for the worlds poor and how the huge environmental impacts can be controlled (Godwin 2003). This essay will look at the issue of ethics in the tourism industry, highlighting the need for responsible tourism; what instigates responsible tourism; related approaches to responsible tourism; companies that promote responsible tourism; set guidelines for tourism and then conclusion. Ethics and the Tourism Industry Tourism has come into view as a major force in the worldwide economy, with most countries, having increasing opportunities to participate, as both tourism destinations and tourists (Ashley et al, 2001). However, many local populations are faced with not only a loss of their traditional livelihoods, but also the viewpoint that they may be moved from where they lived to make way for new tourism developments. Many of the problems faced by the tourism industry are ethical in nature, including destruction of the environment, pollution, depletion of natural resources, economic imperialism, and sexual exploitation. In response to these ethical tensions, there has been recognition of the need to consider the concept of responsible tourism, tourism that creates better places for people to live in, and better places to visit. It extends the idea of eco-tourism or sustainable tourism to include social and ethical as well as environmental considerations. The World Tourism Organisation (2002) described responsible tourism as a concept that relates to all forms of tourism which respect the tourism destination, the natural, built and cultural environment, and the interests of all. Also, the Cape Town Declaration on Responsible Tourism in Destinations (2002) describes Responsible Tourism as tourism that reduces harmful economic, environmental and social impacts; create more economic benefits for local communities; provides interesting experiences for tourists through meaningful interactions with local communities and cultures and improves the well being of tourism destinations. Responsible Tourism is ab out the legacy and the consequences of tourism for the environment, local people and local economies. Various countries and organisations such as South Africa, United Kingdom, United States, Gambia, India, Sri Lanka, are already practicing responsible tourism. Drivers of Responsible Tourism Globally, concerns about global warming, destruction of the environment, wearing away of cultures, and poverty, are increasing. The number of initiatives aimed at improving the living conditions for the worlds vulnerable people, increases daily (WTO, 2000). The awareness of the earths predicament is spilling over into the way people behave in their homes, how they spend their money and the way businesses are run. Driven by changing personal ethics, individuals contribute financially or otherwise to environmental and humanitarian initiatives. For instance, in the UK, the market share for ethical products grew by 22% between 1999 and 2004 (The Ethical Consumerism Report, 2005). Business ethics are also changing, with companies adopting business practices that are based on ethical values (Goodwin, 2000). Responsible Tourism is no longer seen as a passing trend and has now become a recognised and accepted sector within the industry with holidaymakers becoming more aware of their responsibilities as travellers (UNEP, 2000). In 1996, South Africa was the first country to take on responsible tourism as a nationwide policy; the White Paper on the Development and Promotion of Tourism in South Africa (1996) sees responsible tourism as a positive approach by tourism industry and partners to develop, market, and manage the tourism industry in a responsible manner. The White Paper state that the environment is the responsibility of the tourism industry, through the promotion of balanced and sustainable tourism, and a focus on environmentally based tourism activities; it is the responsibility of government and business to involve the local communities that are in close proximity to tourism infrastructure and attractions, through the development of meaningful economic linkages; tourists, busines s and government should respect, invest and develop local cultures, and protect them from over commercialization and over-exploitation; local communities should become actively involved in the tourism industry, to practice sustainable development, and to ensure the safety and security of visitors; and tourists should observe the norms and practices of South Africa (DEAT, 1996). Related Approaches to Responsible Tourism Pro-poor tourism, community-based tourism, volunteer tourism, are different approaches to tourism, they are all based on the three pillars of sustainable development. However, each approach has a precise goal. Responsible tourism is a unifying term that embraces all these approaches. This section will focus mainly on pro-poor tourism in relation to responsible tourism. The concept of pro-poor tourism was developed in 1999 with the aim of increasing opportunities for the poor and to control all forms of tourism at different location (DFID, 1999). According to Ashley et al (2001), pro-poor tourism generates net benefits for the poor; these benefits may be economic, social, environmental or cultural. The core activities needed includes: increasing access of the poor to economic benefits by increasing business and employment opportunities for the poor; providing training so they are in a position to take up these opportunities and spreading income beyond individual earners to the wider community; addressing the negative social and environmental impacts often associated with tourism such as lost access to land, coastal areas and other resources and social interference or exploitation; policy restructuring by creating a policy and planning framework that removes some of the barriers to the poor, by promoting participation of the poor in planning and deci sion-making processes surrounding tourism; and by encouraging partnerships between the private sector and poor people in developing new tourism products (Goodwin, 2000). Case Examples of Companies promoting Responsible Tourism UK Association of Independent Tour Operators (AITO) AITO is the first tourism industry association to incorporate into its business deed a commitment to Responsible travel. Companies such as AITO identify the need to respect other peoples domicile and culture. As tour operators, they acknowledge that wherever a tour operator does business, it has a potential environmental, social and economic impact on the destinations involved (Goodwin, 2005). As a result, AITO aims to be responsible in all their dealings on each of these three levels. In order to achieve this goal, a set of guidelines has been planned to help companies, customers and local suppliers recognise their general tasks which includes protection of the environment; respect of local cultures and customs; benefit for local communities; conservation of natural resources and pollution control (AITO Responsible Tourism Guidelines 2000). Responsibletravel.com According to Responsibletravel.com launched in 2001, responsible travel involves bringing tourists closer to local cultures and values. Since their launch, they have worked with large numbers of tour operators to help establish effective responsible tourism policies; they have led the way in offering outstanding holidays worldwide that benefit local communities and stand as the worlds leading travel agent for responsible holidays. The company through public relations is one of the most active voices in the responsible tourism movement today. Responsible travel maximises the benefits, and minimises the negative effects of tourism. Their activities have been grouped into four: before booking for holidays; before travel, while on holidays and back home. Before booking for holidays includes encouraging travellers to choose a responsible operator to enquire about eco-friendly accommodations; reducing carbon emissions by taking some holidays closer to home, travel by train and public transport where possible, booking direct flights avoiding transfers; before travel states the need for travellers to read up on local cultures and learn a few words of the local  language, remove all excess packaging as waste disposal is difficult in remote places and developing countries, ask tour operators for specific tips for responsible travel in chosen destination; while on holiday emphasizes the need to buy local produce, hire a local guide, respect local cultures, traditions and holy places, use public transport, hire a bike or walk when convenient; and back home state that tourists should give feedback to tour operator or hotel about holiday, and include any suggestions on reducing environmental impacts and increasing benefits to local communities (responsibletravel.com). Guiding Principles for the Tourism Industry Numerous codes of ethics have been developed that are aimed first at tourists and second at the tourist industry as a result of a growing concern over alleged irresponsible practices by tourists, the tourist industry, and governments. These codes generally address ethical principles focusing on a sense of responsibility (WTO, 1999). Table 1 and 2 shows a summary of the recommended guidelines for the tourism industry. Guidelines for the industry Aid meaningful interactions between tourism destinations and tourists and respond to the special travel needs of diverse population groups. Strengthen and improve landscape character, sense of place, community identity, and benefits flowing to the community as a result of tourism. Protect and enhance natural, historic, cultural and aesthetic resources as a legacy for present and future generations. Encourage tourism research and education which lay emphasis on ethics, heritage preservation, and the tourism destination; and the required information to ensure the economic, social, cultural and environmental sustainability of tourism. Promote greater public awareness of the economic, social, cultural, and environmental significance of tourism. Table 1: Guidelines for Tourism Industry (Tourism Industry Association of Canada, 2005). Guiding Principles for Economic Responsibility Considering the opportunity costs of tourism for local communities; maintaining and encouraging economic diversity. Maximising local economic benefits by increasing linkages and reducing leakages Ensure communities are involved in tourism. Considering co-operative advertising, marketing and the promotion of new and emerging products. Recruit and employ staff in an equitable and transparent manner and maximise the proportion of staff employed from the local community. Guiding Principles for Social Responsibility Involve the local community in planning and decision-making. Identify and monitor potential adverse social impacts of tourism and minimise them. Maintain and encourage social and cultural diversity. Be sensitive to the host culture; respecting and developing local heritage. Guiding Principles for Environmental Responsibility Follow best practise guidelines on the design, planning and construction of buildings and associated infrastructure to minimise environmental impacts. Use local materials appropriately. Avoid damaging the environmental quality of the enterprises neighbourhood by noise or light pollution. Use local resources sustainably. Maintain and encourage natural diversity. Table 2: Responsible Tourism Guidelines for the South African Tourism Industry (Spenceley, 2001) Conclusion Responsible tourism is rising as new ideas which aim to push the mainstream tourism industry. Model projects and successful multi-stakeholder ideas, are also beginning to grow (UNEP 2000). These few examples perhaps prove that tourism has the potential to meet many of the objectives of sustainable development such as renewal of economies, supporting local communities, protecting the environment and even generate cost savings and efficiency gains for tourism companies. Promotion of responsible tourism, through the development of policies, awareness-raising schemes, local participation, guidelines for good practice and actual implementation remain essential goals (WTO, 1999). Responsible tourism should aim to directly support poverty eradication and sustainable production and consumption. Making progress on a larger scale will be an appropriate balancing act and will require a massive turn around in approach from the whole Travel and Tourism industry nevertheless it is an approach that obviously requires support from all stakeholders interested and involved in the industry (UNEP, 2000). Tearfund (2001) highlights that ethics in tourism is an issue of concern in most countries. As the public have more free time available and more money to spend on leisure, and as a rising number of people travel to developing countries, they will want to make certain that their holiday will benefit, and not deter, the local people, environment, customs and heritage.

Education and Acculturation in Our Lives :: essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚  Do you believe that there is more than one way to â€Å"see† things? If you were given a piece of art to look at, what would you â€Å"see†? Would you see the same thing as a three year old, as your friend in Korea, or as your art teacher? Why is it that each person would see the picture differently? Is the picture not the same in each case? Why would each person not see the same thing or interpret it the same way? According to Cole, the way we perceive things in our day-to-day lives is highly due to our education and acculturation. Each person sees things differently because of the way they have been raised, and the culture and education they have been given.   Ã‚  Ã‚  Ã‚  Ã‚  The senses play a vital part in the lives of individuals and the way they interpret the things around them. â€Å"[The sense of] touch has been described as the most primitive and the most personal of the five senses† (Colombo, Gary pg.27). Touch, though often unnoticed, is the physiological sense by which external objects or forces are perceived through contact with the body. Lopez writes, â€Å"Eventually I visited many places, staying with different sorts of people. Most worked some substantial part of the day with their hands† (pg.32). Many times touch is overlooked as an educational tool. Touch is one of the things that are very significant in developing people both physically and emotionally and in linking us to other human beings. The sense of sight plays an important role as an educational device. We use our sense of sight to visually interact with our surroundings. With this sense we can recognize objects around us and make new discoveries. The mind plays a direct role in the way we respond to and interpret the things we see. The human eye provides the brain with vast amounts of visual information, in which the brain then registers or disregards in memory. The brain oftentimes transmits signals back to the person which cause a physical or emotional reaction. For example, when one touches a pointy object or hits one’s knee on a hard surface, one feels pain not from the pointy object or the hard surface but by the interpretation in one’s mind from electrical signals inside the brain. This is what causes one to yell out in agony when these particular situations occur. The more educated one becomes, whether it is by learning through experience as one gets older and/or being educated in school, the greater ones capability to sense their surroundings is. Education and Acculturation in Our Lives :: essays research papers   Ã‚  Ã‚  Ã‚  Ã‚  Do you believe that there is more than one way to â€Å"see† things? If you were given a piece of art to look at, what would you â€Å"see†? Would you see the same thing as a three year old, as your friend in Korea, or as your art teacher? Why is it that each person would see the picture differently? Is the picture not the same in each case? Why would each person not see the same thing or interpret it the same way? According to Cole, the way we perceive things in our day-to-day lives is highly due to our education and acculturation. Each person sees things differently because of the way they have been raised, and the culture and education they have been given.   Ã‚  Ã‚  Ã‚  Ã‚  The senses play a vital part in the lives of individuals and the way they interpret the things around them. â€Å"[The sense of] touch has been described as the most primitive and the most personal of the five senses† (Colombo, Gary pg.27). Touch, though often unnoticed, is the physiological sense by which external objects or forces are perceived through contact with the body. Lopez writes, â€Å"Eventually I visited many places, staying with different sorts of people. Most worked some substantial part of the day with their hands† (pg.32). Many times touch is overlooked as an educational tool. Touch is one of the things that are very significant in developing people both physically and emotionally and in linking us to other human beings. The sense of sight plays an important role as an educational device. We use our sense of sight to visually interact with our surroundings. With this sense we can recognize objects around us and make new discoveries. The mind plays a direct role in the way we respond to and interpret the things we see. The human eye provides the brain with vast amounts of visual information, in which the brain then registers or disregards in memory. The brain oftentimes transmits signals back to the person which cause a physical or emotional reaction. For example, when one touches a pointy object or hits one’s knee on a hard surface, one feels pain not from the pointy object or the hard surface but by the interpretation in one’s mind from electrical signals inside the brain. This is what causes one to yell out in agony when these particular situations occur. The more educated one becomes, whether it is by learning through experience as one gets older and/or being educated in school, the greater ones capability to sense their surroundings is.

Manners Makes Man

A man is known to be good or bad according to the way he behaves towards others and under some circumstances. When his habits and manners are good, he is known to be a gentleman. A man with proper manners attracts the attention and admiration of everyone, whereas the man with ill-manners draws himself the ridicule and contempt of others. Cultivation of good manners should be started from the childhood and it is done so, it would become an asset in life. An accident was witnessed many years ago could be cited in support of such training being given early in life.A man is known to be good or bad according to the way he behaves towards others and under some circumstances. When his habits and manners are good, he is known to be a gentleman. A man with proper manners attracts the attention and admiration of everyone, whereas the man with ill-manners draws himself the ridicule and contempt of others. Cultivation of good manners should be started from the childhood and it is done so, it wou ld become an asset in life. An accident was witnessed many years ago could be cited in support of such training being given early in life.A well dressed and educated couple who appeared to belong to the higher levels of society were traveling in a first class compartment of an express train and with them was their girl child of about 3 years old. There were only three or four other passengers in the compartment. A few minutes after the train steamed out of the station, the child asked for a biscuit and it was given by her mother. When the girl was about to eat that, the mother snatched it away from her hands. A few minutes later this â€Å"drama† was enacted three times, the biscuit being snatched away when it was about to put to the lips.This attracted the attention of other passengers. The fourth time girl asked for the biscuit and when it was given, she said â€Å"Thank you Mummy†, and she was permitted to eat the biscuit. This was a training in good manners, traini ng in courtesy, not given with scolding and rebukes and reminders from the mother, but one of a lesson in self-realisation. This child was made to think and act; It was made to think and understand about the apparently meaningless and seemingly cruel act of the mother. If such training is given to every child the world would be a better place to live in.A man may be wealthy; he may be handsome; or he may, in addition have the advantage of enjoying power and position. But if he does not possess good manners, it would be useless to have such advantages. All these assets would be poor compensation for the lack of good manners. There are many who would put up with even in insults from others, but would not tolerate bad manners. Good manners are invaluable to people everywhere, in every walk of life. The executive in an industrial concern would be honoured and respected more if his manners are such as to be courteous and polite to the subordinates.If a businessman forgets manners and is impolite, if not positively rude to his customers and employees, he will lose his customers and consequently have a loss in business financially too. The same principle applies to the principal or professor in a college or university, to a lawyer or doctor. Good manners as exemplified in courtesy in speech and action are indispensable to traveling medical representatives or salesman, for their success depends upon the possession of this quality.They can be sure of good clientele only if they eschew rudeness or incivility or ill temper Good manners are, therefore, manifestation of good breeding and are indispensable to everyone. The personality of a man is well brought out by his behaviour and speech and these are reflections of good manners. Even a man of ordinary looks or appearance, or a man who is not handsome may make a deep impression on others and give pleasures to others in his company if he possesses good manners.Similarly, an unscrupulous man may also succeed in his ways an d hide his real nature if he develops his manners and passes for a gentleman. His courteous and polite actions or speech may succeed in deceiving others as to his real intention and nature. Such is the effect of manners. A man is known by the dress he wears it is said. He will be better known to others if he possesses fine manners. Notoriety may also result from outward manners. Whether a man is good or bad, popular or unpopular, famous or notorious will depend upon his manners.His company would be welcomed or hated according to the manner in which he behaves with others. Hence, if one trains one?s children is in the development of courteous speech and action and polite behaviour one can be proud of giving to the nation worthy citizens. If you have good behaviour, You can conquer herats. If not, know how to attract others http://expertscolumn. com/content/how-attract-others-and-how-increase-your-personality-want-become-star Know how to become smart from today http://expertscolumn. c om/content/be-smart-today

Logic Gates

A Project Report On WORKING OF LOGIC GATES SUBMITTED BY:- Shamil Choudhury ROLL__________ No_____________ Karimganj Junior College Of Science CONTENTS†¦Ã¢â‚¬ ¦.. TOPICS Page No 1. CERTIFICATE1 2. INTRODUCTION 2 3. THEORY3-4 4. EXPERIMENT5-6 5. RESULTS 7 6. CONCLUSION. 7 7. ACKNOWLEDGEMENT 8 8. REFERENCE 9 INTRODUCTION A gate is a digital circuit that follows certain logical relationship between the input and output voltages. Therefore, they are generally known as logic gates — gates because they control the flow of information. The five common logic gates used are NOT, AND, OR, NAND, NOR. Each logic gate is indicated by a symbol and its function is defined by a truth table that shows all the possible input logic level combinations with their respective output logic levels. Truth tables help understand the behavior of logic gates. These logic gates can be realized using semiconductor devices. Here we will investigate on the working of first three logic gates i. e. OR, AND, and NOT gate. OBJECTIVE OF THE PROJECT To demonstrate the working of logic gates using torch bulb, battery and switches. APPARATUS REQUIRED To demonstrate the working of the logic gates we require the following apparatus:- i) A BATTERY OF 6 V. ii) TWO SWITCHES (KEYS). iii) TORCH BULB. iv) CONNECTING WIRES THEORY There are three basic logic gates: 1. The OR Gate * An OR gate has two or more inputs with one output. It operates in such a way that a output is high (i. e. 1) if one of the two inputs (or both the inputs) is high. The symbol of OR Gate is It works on the following truth table:- 2. The AND GATE * An AND gate has two or more inputs and one output. It operates in such a way that the output is high (i. . 1) when both the inputs are high. The symbol of AND Gate is It works on the following truth table:- 3. The NOT Gate * The NOT gate has single input and single output. The output is not the same as input. If the input is low (i. e. 0), the output is high (i. e. 1). On the other hand, the output will be low (i. e. 0) if the input is high (i. e. 1). In other words it performs a negation operation on the input and call ed the invertor. The symbol of NOT Gate is It works on the following truth table:- PROCEDURE (1) Working of OR Gate The electric circuit diagram is as shown Using the above circuit diagram we proceed as follows: (i) The switches S1 and S2 are not pluged and the glow of the bulb is recorded (do not glow) . (ii) Now the switch S1 is plugged (not S2), it is found that the bulb glows. (iii) Now the switch S2 is plugged (not S1), it is observed that the bulb glows. (iv) Both the switches are plugged, the bulb glows. (2) Working of AND gate The electric circuit diagram is shown Using the above circuit diagram we proceed as follows: (i) The switches S1 and S2 are not plugged and the glow of the bulb is recorded (do not glow) . ii) Now the switch S1 is plugged (not S2), it is found that the bulb does not glow. (iii) Now the switch S2 is plugged (not S1), it is observed that the bulb does not glow. (iv) Both the switches are plugged, the bulb glows. 3. Working of NOT gate The electric circuit diagram is shown Using the above circuit diagram we proceed as follows: (i) The switch S is not plugged and the glow of the bulb is recorded(the bulb glows) . (ii) The switch S is plugged and the glow of the bulb is recorded(the Bulb does not glow). RESULT 1. Results for the OR gate S1 | S2| Bulb glows| Off On Off On| Off Off On On| No Yes Yes Yes| 2. Results for the AND gate S1 | S2| Bulb glows| Off On Off On| Off Off On On| No No No Yes| 3. Results for the NOT gate S| Bulb glows | Off On| Yes No| CONCLUSION Thus we find that the logic gates works according to their corresponding truth table. ACKNOWLEDGEMENT I extend my sincere thanks to our Dr Sujit Tiwari for his advice and help in the matter of preparing the project. I also express my deep sense of gratitude to my friends forextending all possible help in supplying project information, which I have used while preparing the project. They have given lots of information for preparation of the report I sought. My parents have supplied me all kinds of necessary materials and information for the report files. Hence, I am grateful to them also. REFERENCE [1] Concept of Physics – H. C. Verma. [2] Comprehensive Practical Physics.