A study published Monday found that people who sleep less tend to be fat，and experts said it's time to find out if more sleep will fight fatness.

    “We've put so much emphasis on diet and exercise that we've failed to recognize the value of good sleep，”said Fred Turek，a physician at Northwestern University.

    Monday's study from Eastern Virgnia Medical School in Norfolk covered 1,000 people and found that total sleep time decreased as body mass index－a measure of weight based on height increased.

    “Men slept an average of 27 minutes less than women and overweight and fat patients slept less than patients with normal weights，”it said.In general the fatter subjects slept about 1.8 hours a week less than those with normal weights.

    “Americans experience insufficient sleep and fat bodies.Clinicians are aware of the burden of fatness on patients，”the study said.

    “Our findings suggest that major extensions of sleep time may not be necessary，as an extra 20 minutes of sleep per night seems to be associated with a lower body mass index，”it added.

    “We caution that this study does not set up a cause­and­effect relationship between restricted sleep and fatness，but investigations indicating success in weight loss via extensions of sleep would help greatly to set up such a relationship.”

    The study was published in the Archives of Internal Medicine along with an editorial by Turek and Northwestern colleague Joseph Bass commenting on it and related research.

    In an interview，Turek said some studies have shown the lack of sleep causes declines in an appetiteholding back protein hormone，and increases in another hormone that cause a longing for food.“In addition neuropathies(神经疗法)in the brain governing sleep and fatness appear to overlap(部分重叠)，”he said.

    “Fatness has been rising dramatically in developed countries and reached epidemic(流行病)levels in the United States，”it added，“leading to a variety of health problems.”

     “The gaokao,China's national college entrance exam,is winning more recognition as a way for universities overseas to evaluate Chinese students,”recruiting officers said.

    Stanley Nel,vice-president of international relations at the University of San Francisco in the United States,who is responsible for the university's admissions from China,said he had had several inquiries from US universities about how to recruit Chinese students on the basis of their gaokao scores.

    The Test of English as a Foreign Language (TOEFL) and the Scholastic Aptitude Test (SAT) have long been two musts for students from other counties,including China,to apply to study in the US.

    USF,a private university in California,started a pilot program to accept Chinese students based on their gaokao scores in 2015.The idea came from USF President Paul Fitzgerald's belief that standardized tests like the SAT are not very good predictors of how well students will do at the university."We are aware of the many criticisms that have been made of the gaokao,but it has the advantage of being what educational experts call a 'criterion-referenced' exam: It tests whether students are able to master a given body of knowledge,"he said.

    Currently,at least four higher education institutions in the US are recruiting Chinese students based on their gaokao performances.The Illinois Institute of Technology,a private institution in Chicago,started the practice first,in 2009.Outside the US,countries including Spain,Italy,Singapore,France and Australia also recognize gaokao scores.

    More than 200 students from China requested an interview with USF last year.74 of them were selected for a follow-up interview,44 received offers and 20 accepted the invitation and joined USF for the 2015 fall semester. Students admitted in this way have done "exceptionally well" in the past academic year,Nel added."The average GPA for all gaokao students is about 3.5 out of 4.For all other students—American and non-gaokao international students—American and non-gaokao international students—the average GPA is 3.2,"he said.

    Zhu Zihao gained admission in computer sciences at USF in 2015 through the program and performed well in his first academic year.He said that students who had experienced China's gaokao usually had comprehensive basic knowledge,which helps them excel in studies.

    Nel said,"students admitted through China's gaokao are not only smart but extremely conscientious（认真的）and hardworking."

    "This year we hope to recruit about 50 students in this way,and even more in years to come,"he said.

    Scientists say eating less can slow the aging process of cells in the body. The researchers studied mice, not people.

    {#blank#}1{#/blank#}One group was able to eat as much as it wanted. The other animals in the other group are limited to eat. Their diet had 35 percent fewer calories than the first group of mice.

    The mice with the diet restrictions(限制) were more energetic and suffered fewer diseases. They were not just living longer, they seemed to stay younger for a longer period of time. When you restrict calories (in mice), there is a direct increase in lifespan - the average age of the animal{#blank#}2{#/blank#}

    But how? The researchers found that fewer calories slow down a natural mechanism in cells called ribosomes (核糖体). Ribosomes are responsible for making important proteins in the cells. But with fewer calories, they slow down.{#blank#}3{#/blank#}This, in turn, keeps cells and the entire body functioning well.

    Earlier studies have suggested a link between calorie restrictions and slowed aging{#blank#}4{#/blank#}Calorie restriction as a way to slow aging has not been tested in humans. But the main finding for people is the importance of taking care of our bodies{#blank#}5{#/blank#} And this may help us make better decisions about what we eat.

A. The less we eat, the healthier we are.

B. Researchers studied two groups of mice.

C. This finding is good news if you are a mouse.

D. This gives the cells more time to repair themselves.

E. The findings help to explain how exactly our bodies age.

F. However, this is first to show how the ribosomes can influence aging.

G. Calorie restriction caused real biochemical changes that slowed down the rate of aging.

    “Urgent action required”, “Do you still want to hear from us?”, “We've updated our privacy policy”, “Should we stop sending you updates? If not, act now!”

    Many of us will have received emails like this during the past few weeks. Triggering this flood of emails is something called GDPR that comes into effect in just under two weeks' time. Often the emails warn that if you don't respond, you will be removed from the company's database, which raises a lot of questions. What action, if any, do you need to take? Could it affect you financially?

    GDPR, which stands for General Data Protection Regulation, has been described as the biggest overhaul（彻底检查）of online privacy since the birth of the internet. It is designed to give all EU citizens the right to know what data is stored on them and to have it deleted, plus protect them from privacy breaches（破坏）. It comes into effect on 25 May.

    The new rules encourage the requirement for explicit and informed consent before data is processed. As a result, companies and organizations around the world are contacting users to check they are happy to carry on receiving their emails.

    However, many of us seem to be going down with “GDPR fatigue（厌倦）”: one article last week claimed that the “reconfirmation rate” - the proportion of people saying they want to continue receiving a company's emails - at UK micro-businesses was averaging just 10%, which meant “they could lose 90% of their subscribers - the life-blood for their business”. So it's no wonder some firms have adopted policies such as offering to enter people into a prize draw in return for them going in and updating their communication preferences.

    The average adult is said to have about 100 “data relationships” — companies and organizations that hold our personal data. Meanwhile, the reason why the company that occasionally emails you newsletters is now asking for your consent is perhaps because you never explicitly gave it permission to send you stuff. Maybe you only get its emails because you went to an event it organized ages ago or you once downloaded something from its website. Under the new regime, that almost certainly wouldn't count as explicit and informed consent, hence it's getting in touch now.

    The bottom line is that if it is a company or organization that you want to continue hearing from, you should probably click the button or log in to ensure you keep getting its emails. If it doesn't hear from you, it may decide to take you off its database.

    Find a quiet location. Keep a routine. Focus on one subject at a time. It all seems like sound advice for students who need to hit the books, {#blank#}1{#/blank#} . Here's a list of tips from Carey, a scientist, for getting the most out of your study time.

    {#blank#}2{#/blank#}.

    Doing practice quizzes can help you retrieve（检索）information on test day. “Tests have a very bad reputation as a measurement tool,” Carey says. But psychologists have found self-tests slow down the forgetting of material you've studied. “If you study something once, and then you test yourself on it,” Carey says, “you do better than if you study it twice over.”

    Move around

    {#blank#}3{#/blank#} . “If you move around and study the same material in several places,” he says, “you may be forming multiple associations for the same material. So it's better anchored in your brain, and you can pull it out easier.”

    Mix it up

    Think about a football who does strength training, speed training and drills. Carey says alternating between different facets facts of a subject in a single sitting can “leave a deeper impression on the brain”. For example, when studying French, do some verbs, some speaking and some reading. {#blank#}4{#/blank#} .

    Space it out

    Information learned in a hurry is lost just as fast. So if you really want to learn, space out shorter, hour-long study sessions. “There's no doubt that you can cram for（突击备考）an exam.” Carey says, “{#blank#}5{#/blank#} . And once it's gone, “it's gone. You're not getting it back.”

A. Test yourself

B. Study it and practice more

C. and it turns out that some of them are in great help

D. but recent studies indicate the conventional wisdom is wrong

E. The problem is that it's so easy to forget what you just crammed

F. Changing up where you study can help you keep more information

G. Spending your time in deep concentration on just verbs isn't effective

    How do you prove you really are who you say you are? Maybe you have many ways to prove your identity: a birth certificate, a driver's license, a Social Security card, or a passport.

    But imagine that you are one of the one billion people in the world­most of them among the poorest­who have no official identification. No birth certificates. No official ID documents. Nothing. Without a way to prove who you are, you would face huge problems: going to school, seeing a doctor, getting a bank account...

    For the last decade, NandanNilekani has been working to make the world's invisible people visible by giving them access to official identification. One of India's leading technology experts, Nandan joined the government to lead the launch of India's national biometric ID system, which uses fingerprints and other biological characteristics to check the identities of the country's more than 1.3 billion residents. This ID system, known as Aadhaar (Hindi for "foundation"), is the world's largest biometric identification system and has become a valuable government platform for delivering social welfare programs and other government services.

    Now, Aadhaar has enrolled nearly all residents of India. With a trustworthy system to check identities of beneficiaries for everything from pensions to food moneies, the government has been able to save billions of dollars because of reduced cheating and dishonesty.

    Of course, India's ID system has not been without controversy. There were many privacy concerns, including criticism that the Aadhaar system was a mass monitoring tool and that personal data would be misused. Last year, a landmark decision by the Supreme Court of India found that the program did not violate the privacy rights of the country's residents. But in order to prevent misuse of personal data, the court placed tight limits on how the ID system could be used and shared.

    According to the latest data by the World Bank, there are one billion people in the world without an official proof of identity, including 45 percent of the population in sub­Saharan Africa and 17 percent of South Asia's population.

    Thanks to the work Nandan is doing, the world is moving closer to the day when everyone will have access to an official ID. The sooner we can achieve this goal, the sooner the world's poorest residents will not only be able to prove who they are, but also realize their dreams for better lives.