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At the present time, 98 percent of the world energy consumption comes from stored sources, such as fossil fuels or nuclear fuel. Only hydroelectric and wood energy represent completely renewable sources on ordinary time scales.Discovery of large additional fossil fuel reserves, solution of the nuclear safety and waste disposal problems, or the development of controlled thermonuclear fusion will provide only a short-term solution to the world’s energy crisis. Within about 100 years, the thermal pollution resulting from our increased energy consumption will make solar energy a necessity at any cost. Man’s energy consumption is currently about one part in ten thousand that of the energy we receive from the sun. However, it is growing at a 5 percent rate, of which about 2 percent represents a population growth and 3 percent a per capita energy increase. If this growth continues, within 100 years our energy consumption will be about 1 percent of the absorbed solar energy, enough to increase the average temperature of the earth by about one degree centigrade if stored energy continues to be our predominant source. This will be the point at which there will be significant effects in our climate, including the melting of the polar ice caps, a phenomenon which will raise the level of the oceans and flood parts of our major cities. There is positive feedback associated with this process, since the polar ice cap contributes to the partial reflectivity of the energy arriving from the sun:As the ice caps begin to melt, the reflectivity will decrease, thus heating the earth still further. It is often stated that the growth rate will decline or that energy conservation measures will preclude any long-range problem. Instead, this only postpones the problem by a few years.Conservation by a factor of two together with a maintenance of the 5 percent growth rate the problem by only 14 years. Reduction of the growth rate to 4 percent postpones the problem by only 25 years; in addition, the inequities in standards of living throughout the world will provide pressure toward an increase in growth rate, particularly if cheap energy is available. The problem of a changing climate will not be evident until perhaps ten years before it becomes critical due to the nature of an exponential growth rate together with the normal annual weather variations. This may be too short a period to circumvent the problem by converting to other energy sources, so advance planning is a necessity. The only practical means of avoiding the problem of thermal pollution appears to be the use of solar energy. (Schemes to "air-condition" the earth do not appear to be feasible before the twenty-second century. ) Using the solar energy before it is dissipated to heat does not increase the earth’s energy balance. The cost of solar energy is extremely favorable now, particularly when compared to the cost of relocating many of our major cities. |
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Visitors to St. Paul’sCathedral are sometimes astonished as they walk round the space under the arch to come upon a statue which would appear to be that of a retired armed man meditating upon a wasted life. They are still more astonished when they see under it an inscription indicating that it represents theEnglish writer, Samuel Johnson. The statue is byBacon, but it is not one of his best works. The figure is, as often in eighteenth-century sculpture, clothed only in a loose robe which leaves arms, legs and one shoulder bare.But the strangeness for us is not one of costume only. If we know anything of Johnson, we know that he was constantly ill all through his life; and whether we know anything of him or not we are apt to think of a literary man as a delicate, weakly, nervous sort of person. Nothing can be further from that than the muscular statue.And in this matter the statue is perfectly right.And the fact which it reports is far from being unimportant. The body and the mind are closely interwoven in all of us, and certainly in Johnson’s case the influence of the body was extremely obvious. His melancholy, his constantly repeated conviction of the general unhappiness of human life, was certainly the result of his constitutional infirmities. On the other hand, his courage, and his entire indifference to pain, were partly due to his great bodily strength. Perhaps the vein of rudeness, almost of fierceness, which sometimes showed itself in his conversation, was the natural temper of an invalid and suffering giant. That at any rate is what he was. He was the victim from childhood of a disease which resembled St Vitus’sDance. He never knew the natural joy of a free and vigorous use of his limbs; when he walked it was like the struggling walk of one in irons.All accounts agree that his strange gestures and contortions were painful for his friends to witness and attracted crowds of starers in the streets.But Reynolds says that he could sit still for his portrait to be taken, and that when his mind was engaged by a conversation the convulsions ceaseD、In any case, it is certain that neither this perpetual misery, nor his constant fear of losing his reason, nor his many grave attacks of illness, ever induced him to surrender the privileges that belonged to his physical strength. He justly thought no character so disagreeable as that of a chronic invalid, and was determined not m be one himself. He had known what it was to live on four pence a day and scorned the life of sofa cushions and tea into which well-attended old gentlemen so easily slip. |
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Motorways are, no doubt the safest roads inBritain. Mile{{U}} (41) {{/U}}mile, vehicle for vehicle, you axe much{{U}} (42) {{/U}}likely to be killed or seriously injured than on an ordinary roaD、On{{U}} (43) {{/U}}hand, if you do have a serious accident on a motorway, fatalities are much more likely to{{U}} (44) {{/U}}than in a comparable accident{{U}} (45) {{/U}}on the roads. Motorways have no{{U}} (46) {{/U}}bends, no roundabouts or traffic lights and{{U}} (47) {{/U}}speeds are much greater than on other roads. Though the 70 mph limit is{{U}} (48) {{/U}}in force, it is often treated with the contempt that most drivers have for the 30 mph limit applying in built up areas inBritain.Added to this is the fact that motorway drivers seem to like traveling in groups with perhaps{{U}} (49) {{/U}}ten meters between each vehicle. The resulting horrific pile-ups{{U}} (50) {{/U}}one vehicle stops for some reason—mechanical failure, driver error and so on—have become all{{U}} (51) {{/U}}familiar through pictures in newspapers or on television. How{{U}} (52) {{/U}}of these drivers realize that it takes a car about one hundred meters to brake to a stop {{U}} (53) {{/U}}70 mphDrivers also seem to think that motorway driving gives them complete protection from the changing weather.{{U}} (54) {{/U}}wet the road, whatever the visibility in mist or fog, they{{U}} (55) {{/U}}at ridiculous speeds oblivious of police warnings or speed restrictions{{U}} (56) {{/U}}their journey comes to a conclusion. Perhaps one remedy{{U}} (57) {{/U}}this motorway madness would be better driver education.At present, learner drivers are barred{{U}} (58) {{/U}}motorways and are thus as far as this kind of driving is{{U}} (59) {{/U}}, thrown in at the deep enD、However, much more efficient policing is required,{{U}} (60) {{/U}}it is the duty of the police not only to enforce the law but also to protect the general public from its own foolishness. |
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{{B}}Text3{{/B}}Thefirstbig-namehackersi
The first big-name hackers include Steve Wozniak,Bill Gates and Linus Torvalds, all now highly recognisable names behind many of the computer technologies used today. These early hackers had a love of technology and a compelling need to know how it all worked, and their goal was to push programs beyond what they were designed to do.Back then, the word "hacker" didn’t have the negative connotation it has today. The original backer ethic, rooted out of simple curiosity and a need to be challenged, appears to be deaD、 The objectives of early hackers are a far cry from the goals of today’s hacker. The motivation of the new breed of hackers appears not to be curiosity, or a hunger for knowledge, as it used to be. Instead, most of today’s hackers are driven by greed, power, revenge, or some other malicious intent, treating hacking as a game or sport, employing the tools that are readily available via the Internet. The rate of security attacks is actually outpacing the growth of the Internet. This means that something besides the growth of the Internet is driving the rise in security attacks. Here are some realities you should know about: Operating systems and applications will never be secure. New vulnerabilities will-be introduced into your environment every day.Even if you ever do get one operating system secure, there will be new operating systems with new vulnerabilities—phones, wireless devices, and network appliances.Employees will never keep up with security polices and awareness. It doesn’t matter how much you train and educate your employees. If your employees disregard warnings about the hazards of opening questionable email attachments, how are you going to educate them about properly configuring firewalls and intrusion detection systems for their PCs Managers have more responsibility than ever.And on top of the realities listed above, security managers are being asked to support increasing degrees of network availability and access. There are some good security measures you can take:Employ a layer 7, full-inspection firewall.Automatically update your anti-virus at the gateway, server and client. Keep all of your systems and applications updateD、Hackers commonly break into a Web site through known security holes, so make sure your servers and applications are patched and up to date. Turn off unnecessary network services.Eliminate all unneeded programs. Scan your network for common backdoor services, and use intrusion detection systems, vulnerability scans, and anti-virus protection. |
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During the past generation, theAmerican middle-class family that once could count on hard work and fair play to keep itself financially secure has been transformed by economic risk and new realities. Now a pink slip, a bad diagnosis or a disappearing spouse can reduce a family from solidly middle class to newly poor in a few months. In just one generation, millions of mothers have gone to work, transforming basic family economics. Scholars, policymakers, and critics of all stripes have debated the social implications of these changes, but few have looked at the side effect family risk has risen as well. Today’s families have budgeted to the limits of their new two-paycheck status.As a result they have lost the parachute they once had in times of financial setback--a back-up earner (usually Mom) who could go into the workforce if the primary earner got laid off or fell sick. This "added-worker effect" could support the safety net offered by unemployment insurance or disability insurance to help families weather bad times.But today, a disruption to family fortunes can not longer be made up with extra income from an otherwise--stay-at-home partner. During the same period, families have been asked to absorb much more risk in their retirement income. Steelworkers, airline employees, and now those in the auto industry are joining millions of families who must worry about interest rates, stock market fluctuation, and the harsh reality that they may outlive their retirement money. For much of the past year, PresidentBush campaigned to move Social Security to a savings-account model, with retirees trading much or all of their guaranteed payments for payments depending on investment returns. For younger families, the picture is not any better.Both the absolute cost of healthcare and the share of it borne by families have risen--and newly fashionable health-savings plans are spreading from legislative halls to Wal-Mart workers, with much higher deductibles and a large new does of investment risk for families’ future healthcare.Even demographics are working against the middle class family, as the odds of having a weak elderly parent--and all the attendant need for physical and financial assistance have jumped eightfold in just one generation. From the middle-class family perspective, much of this, understandably, looks far less like an opportunity to exercise more financial responsibility, and a good deal more like a frightening acceleration of the wholesale shift of financial risk onto their already overburdened shoulders. The financial fallout has begun, and the political fallout may not be far behinD、 |
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