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Why do we along with 75 other countries—alternate between standard time and daylight time Although many people believe it has an agricultural provenance, daylight time has always been a policy meant to save energy. As Benjamin Franklin argued, if people moved up their summer schedules by an hour, they could live by "sunshine rather than candles" in the evenings. Energy conservation was the motivation for daylight time during World Wars I and II and the oil embargo of the 1970s, and it remains so today—even though there has been little scientific evidence to suggest daylight time actually helps us cut back on electricity use. Recently, however, we were able to conduct a study in Indiana, where daylight time was instituted statewide only in 2006. Before that year, daylight time was in effect in just a handful of counties. This change of policy offered a unique, natural experiment to measure the overall effect on residential electricity consumption. We could compare the amount of energy used by households in the late-adopting counties during the two years before they switched to daylight time with the amounts they used during the year afterward—while using counties that always practiced daylight time as a control group. We found that daylight time caused a 1 percent overall increase in residential electricity use, though the effect varied from month to month. The greatest increase occurred in late summer and early fall, when electricity use rose by 2 percent to 4 percent. Daylight time costs Indiana households an average of $3. 29 a year in higher electricity bills, or about $ 9 million for the whole state. We also calculated the health and other social costs of increased pollution emissions at $1.7 million to $5.5 million per year. What explains this unexpected result While daylight time reduces demand for household lighting, it increases demand for heating in the early spring and late fall(in the mornings)and, even more important, for cooling on summer evenings. Benjamin Franklin was right about candles, in other words, but he did not consider air-conditioners. In regions of the United States where demand for air-conditioning is greater than in Indiana, this spike in cooling costs is likely to be even greater. Arizona, one of the hottest states, may have it right; it does not practice daylight time. Eliminating daylight time would thus accord with President-elect Barack Obama"s stated goals of conserving resources, saving money, promoting energy security and reducing climate change. At the very least, we should abandon the notion that we are saving energy while enjoying the extra hour of sunlight on hot summer evenings. It is implied in the text that President Barack Obama would______.
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DNA testing has become something our society relies on very heavily for identification purposes. Everyone has different DNA so it is a unique way to identify an individual. It is the equivalent of a signature only in a genetic form that can"t be altered or hidden. One of the most common uses of DNA testing is to track down criminals who have left hair, skin, or semen at the scene of a crime. A use for DNA testing that is less familiar to most individuals is for tracking down a person"s heritage. It can be hard to determine a person"s heritage without the help of DNA testing. Each person is classified into one of four main groups when it comes to ancestry. Those groups arc East Asian, Native American, African, or European. Many people have some identifying features or skin colors that help to identify their particular line of ancestry. The trouble is that many people have parents from two different ancestry lines. This makes the diversification very hard to track as you start looking back on generations of mixed ancestry. With ancestry DNA it is possible to determine the dominant one for that individual. The testing involved in the ancestry DNA process is done with the technology available today. Ancestry DNA testing involves the process of Single Nucleotide Polymorphism so that the dominant ethnic group can be identified. The Single Nucleotide Polymorphism also tells the percentage of the different ancestry groups that make up the individual"s DNA. While you may wonder why ancestry is so important to some people, the reality is that it does matter. It is interesting to know where your heritage lies and for some people not knowing gives them a void they really want to have filled. This is more important to them than simply fitting into society because of their race or color. There is plenty of debate surrounding the concept of ancestry DNA. Many experts claim it is not a reliable way to determine one"s heritage. They also believe it causes issues with cultural beliefs rather than instilling a sense of their role in society. Others find these claims to be completely ridiculous and place plenty of merit in ancestry DNA test results. There are many good ancestry DNA test locations in the world that do offer individuals the opportunity to find out where their true heritage lies. Meanwhile an independent validation method still has to be adopted before the scientific field is going to accept it. A person"s heritage______.
阅读《郑伯克段于鄢》中的一段文字，然后回答问题。 颍考叔为颍谷封人，闻之，有献于公，公赐之食，食舍肉。公问之，对曰：“小人有母，皆尝小人之食矣，未尝君之羹，请以遗之。”公曰：“尔有母遗，紧我独无!”颍考叔曰：“敢问何谓也”公语之故，且告之悔。对曰：“君何患焉若阙地及泉，隧而相见，其谁曰不然”公从之。公入而赋：“大隧之中，其乐也融融!”姜出而赋：“大隧之外，其乐也泄泄。”遂为母子如初。 本段采用怎样的描写方法和表现手法揭示了郑庄公怎样的性格
DNA testing has become something our society relies on very heavily for identification purposes. Everyone has different DNA so it is a unique way to identify an individual. It is the equivalent of a signature only in a genetic form that can"t be altered or hidden. One of the most common uses of DNA testing is to track down criminals who have left hair, skin, or semen at the scene of a crime. A use for DNA testing that is less familiar to most individuals is for tracking down a person"s heritage. It can be hard to determine a person"s heritage without the help of DNA testing. Each person is classified into one of four main groups when it comes to ancestry. Those groups arc East Asian, Native American, African, or European. Many people have some identifying features or skin colors that help to identify their particular line of ancestry. The trouble is that many people have parents from two different ancestry lines. This makes the diversification very hard to track as you start looking back on generations of mixed ancestry. With ancestry DNA it is possible to determine the dominant one for that individual. The testing involved in the ancestry DNA process is done with the technology available today. Ancestry DNA testing involves the process of Single Nucleotide Polymorphism so that the dominant ethnic group can be identified. The Single Nucleotide Polymorphism also tells the percentage of the different ancestry groups that make up the individual"s DNA. While you may wonder why ancestry is so important to some people, the reality is that it does matter. It is interesting to know where your heritage lies and for some people not knowing gives them a void they really want to have filled. This is more important to them than simply fitting into society because of their race or color. There is plenty of debate surrounding the concept of ancestry DNA. Many experts claim it is not a reliable way to determine one"s heritage. They also believe it causes issues with cultural beliefs rather than instilling a sense of their role in society. Others find these claims to be completely ridiculous and place plenty of merit in ancestry DNA test results. There are many good ancestry DNA test locations in the world that do offer individuals the opportunity to find out where their true heritage lies. Meanwhile an independent validation method still has to be adopted before the scientific field is going to accept it. The author argues that ancestry DNA
We maintain that in general a focus on positive information benefits well-being. However, there are probably conditions when a chronic tendency to focus on positive material is maladaptive. One such context, we presumed, is decision-making, especially when options include both positive and negative features. When making decisions, negative features of options often have higher diagnostic value. If a person who is deciding whether to renew a health care plan remembers that she likes her physician but forgets that the plan does not pay for the hip surgery she needs, a suboptimal decision could be made. Corinna and I designed another study with two primary aims: to see whether in a decision context older people would review positive features of options more than negative features; and if this was the case, to see if we could eliminate the effect by modifying goals with instructions. Using computer-based decision scenarios, 60 older and 60 younger adults were presented with positive, negative, and neutral information about ostensible health care options. Some scenarios presented characteristics of physicians. Others presented features of health care plans. The information was hidden behind colored squares, and participants had to click on the square to see the information. They were told that positive information was behind white squares and negative information was behind black squares. We then observed how often participants examined the positive information versus the negative information. Later we tested their memory for the information. As we predicted, older adults reviewed and recalled a greater proportion of positive information than did younger adults. Most important, participants in one group were repeatedly reminded to "focus on the facts" and in this group the preference for positive information disappeared. Human need is the basis for virtually all of science. If we rise to the challenge of an aging population by systematically applying science and technology to questions that improve quality of life in adulthood and old age, longer-lived populations will inspire breakthroughs in the social, physical, and biological sciences that will improve the quality of life at all ages. Longevity science will reveal ways to improve learning from birth to advanced ages and to deter age-related slowing in cognitive processing. Longevity science will draw enormously on insights about individuals " genomic predispositions and the environmental conditions that trigger the onset of disease. Longevity science will help us understand how stress slowly but surely affects health. Most of the challenges of longer-lived populations will require interdisciplinary collaborations. Psychological science must be a part of this process. The study made by the author and Corrinna shows that ______.
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