1 . Technology use seems to be the new wave of addiction hitting people of all ages. Its extreme use can be compared to the use of drugs, which is called Plugin Heroin.

The next time you’re in a crowded public place, look at the people around you. It’s hard to find someone who isn’t glued to the tiny screen, fingers moving at lightning speeds, texting their friends, emailing co-workers or listening to music. It may seem ridiculous that someone is that addicted to such a small object. I’ve seen people who seem to be at their wits’ end (不知所措) if their phone or iPad has been taken away, lost or left at home.

Some people may ask, “What’s wrong with technology use? It’s a way for people to communicate.” While this is true, the overuse of technology isn’t always appropriate in certain settings. Schools are becoming stricter about the use of cell phones, iPads and other electronics in classrooms. Various workplaces have signs hanging on their walls warning employees that “Cell phone use is not permitted” or “Cell phones are forbidden.”

Electronics may be a way for people to communicate and stay in touch with each other, but the disadvantages may outweigh the benefits. People are losing the ability to hold face-to-face conversations with others. However, it’s hard to avoid electronics in this day and age because almost everything is turning into an electronic format. Books, originally meant for paper design, are now being transferred (转存) to electronic forms. Photo albums, and even yearbooks, can now be viewed via the internet. With this growing trend, future generations are bound to become even more addicted to technology.

Is there a cure for electronic addiction? Simply turning electronics off for an hour or two a day may help to an extent, but it will not completely rid electronic addiction. There only seems to be one cure left, and it may be the hardest: self-control.

Good morning, everyone. Do you know a total amount of food wasted each year in China? It is 50 billion kilograms, that can feed 350 million people a year. You might be astonishing to learn that millions of tons of food are thrown away. Wasting food means wasting resource like water, land and energy. Realize the severe consequences of wasting food, my parents had started to make efforts to save food last month. Now more people are taking action active. As students, we should also join us in this food-saving campaign. Saving food is great benefit to every one of us.

4 . Japan's prime minister encouraged the decision to ban viewers，even family members, by issuing a state of emergency order in Tokyo earlier this month in response to rising COVID-19 case numbers.

From the viewpoint of sports psychologists，an Olympics without fans is a real-life science experiment that is helping researchers and doctors to comb through the true impact of a crowd of fans on its players—and on viewers at home. The strange circumstances under which the games are held may place unexpected pressure on some athletes. On Tuesday, superstar gymnast Simone Biles dropped out of the women's team event，telling teammates and reporters she wasn't in the right "headspace" to compete. "It's been really stressful this Olympic Games. There are a lot of different factors going into it，" Biles told the Washington Post.

The 2020 Summer Olympics bears similarities and differences to other major sporting events without viewers. The English Premier League added game broadcasts with crowd noise from the soccer video game FIFA 20，mixed with game audio in real time. A Taiwanese baseball team and German soccer team began populating stands with cardboard cutouts of fans, and the trend became popular internationally.

Jamey Houle, the lead sports psychologist for Ohio State University Athletics and a former Al-American gymnast, says competitive athletes are trained in visualization(可视化)— imagining performing a certain action or motion, such as doing a roundoff back handspring(翻筋斗) in gymnastics. Without moving a muscle, players using visualization can make their motor cortex (皮层)start working . To visualize most effectively, Houle says, athletes working with sports psychologists will try to simulate as closely as possible the conditions of actual gameplay. Empty stadiums may thus have a clear and important impact on players' performance. This phenomenon is grounded in a psychological concept called "social facilitation", referring to a change in a person's performance that occurs when others are around compared to when a person is alone.

5 . Getting less sleep has become a bad habit for most American kids. According to a new survey(调查) by the National Sleep Foundation, 51% of kids aged 10 to 18 go to bed at 10 pm or later on school nights, even though they have to get up early. Last year the Foundation reported that nearly 60% of 7- to 12-year-olds said they felt tired during the day, and 15% said they had fallen asleep at school.

How much sleep you need depends a lot on your age. Babies need a lot of rest: most of them sleep about 18 hours a day! Adults need about eight hours. For most school-age children, ten hours is ideal(理想的). But the new National Sleep Foundation survey found that 35% of 10- to 12-year-olds get only seven or eight hours. And guess what almost half of the surveyed kids said they do before bedtime? Watch TV.

“More children are going to bed with TVs on, and there are more opportunities(机会) to stay awake, with more homework, the Internet and the phone,” says Dr. Mary Carskadon, a sleep researcher at Brown University Medical School. She says these activities at bedtime can get kids all excited and make it hard for them to calm down and sleep. Other experts say part of the problem is chemical. Changing levels of body chemicals called hormones not only make teenagers’ bodies develop adult characteristics, but also make it hard for teenagers to fall asleep before 11 pm.

Because sleepiness is such a problem for teenagers, some school districts have decided to start high school classes later than they used to. Three years ago, schools in Edina, Minnesota, changed the start time from 7:25 am to 8:30 am. Students, parents and teachers are pleased with the results.

7 . Did you know that the color of uniforms can influence the performance of an athlete? It may sound strange, but a study suggests this might be true.

Two British scientists studied the results of four sports in the 2004 Athens Olympic Games where the athletes had been given either a red or a blue uniform. They discovered that when there was a big difference in the score, color had no influence on the result. But if it was a close match, the athlete in a red uniform was more likely to win. Then they looked at the uniforms of the soccer teams at the Euro 2004 tournament (锦标赛). Again, teams wearing red won more games.

The two scientists got their idea from earlier studies of wild animals. It had been discovered that when a male shows red on its body, it sends a signal of its power and strength. For example, in many kinds of monkey, the more the male shows off its red scars (伤疤) , the more females it can attract.

Based on this fact, the British scientists thought that the idea might work for humans, too. According to them, when an athlete sees a competitor in a red uniform, he gets a feeling that he couldn’t be stronger than his competitor. And that kind of feeling may have a bad influence on the player’s performance in the actual game.

Although the idea is interesting, most people don’t accept that color signals in the animal world can really be useful to humans in sports. They think that it is unreasonable to develop an idea based on such a small number of examples. Much more research has to be done to prove the influence of uniform colors on the performance of athletes.

8 . The bed should be reserved as a place for sleep，but people tend to read an iPad a lot in bed before they go to sleep．

Charles Czeisler，a professor at Harvard Medical School，and his colleagues got a small group of people for an experiment．For five days in a row，the people read either a paper book or an iPad for four hours before sleep．Their sleep patterns were monitored all night．Before and after each trial period，the people took hourly blood tests to paint a day-long picture of just how much melatonin（褪黑激素）was in their blood at any given time．

When subjects read on the iPad as compared to the paper books，they reported feeling less sleepy at night and less active the following morning．People also took longer to fall asleep on the iPad nights，and the blood tests showed that their melatonin secretion（分泌）was delayed by an hour and a half．

The researchers conclude in today's journal article that gives the rise of e-readers and the increasingly widespread use of e-things among children and adolescents，more research into the"long-term consequences of these devices on health and safety is urgently needed．"Czeisler and colleagues go on，in the research paper，to note"Reading an iPad in bed may increase cancer risk．"

However，software has been developed that can reduce some of the blue light from the screens of phones and computers according to time of day，and there are also glasses that are made to filter（过滤）short wavelengths．While they seem like a logical solution for the nighttime tech users，it needs more research．