Parents often think that time spent with their kids will gradually decrease in adolescence. But a new study suggests that while teens try to avoid spending a lot of time together with their parents, private parent-child meetings may actually increase in their early adolescent years. And that may raise a teenager's self-esteem (自尊) and social confidence, especially if it is the time that spent with Dad, the researchers added. The researchers created a long-term study in which they invited families in 16 school districts in central Pennsylvania to participate. In each family, a teenager, a younger sibling (兄弟姐妹), their mother and their father were interviewed at home and then asked about their activities and self-worth five times over a period of seven years.

    The study authors were surprised to discover that when fathers spent more time alone with their teenagers, the kids reported they felt better about themselves. Something about the father's role in the family seemed to improve self-esteem among the teenagers in the study, said study co-author Susan McHale, a professor of human development at Pennsylvania State University.

    “Time with Dad often involves joking, teasing, and other playful interactions. Fathers, compared to mothers, were more involved in leisure activities and had more peer-like interactions with their children, which is crucial for youth social development,” the study showed. But Marta Flaum, a psychologist in Chappaqua, New York, said, “How these findings reflect the real world is a real question. The sample in the study is so small and so unrepresentative of most families in the country today that I'm not sure how much we can generalize from it. In my community in Westchester County, I don't see parents and teenagers spend much time together at all. Parents are often working so hard and have less time to be together with their kids.”

    However, Flaum encourages parents to make time for their kids no matter how much work they have to do. “Research like this reminds us of how important it is. The time we have with them is so short,” she said.

    It was an autumn morning shortly after my husband and I moved into our first house. Our children were upstairs unpacking，and I was looking out of the window at my father moving around mysteriously on the front lawn. “What are you doing out there?” I called to him.

    He looked up, smiling. “I'm making you a surprise.” I thought it could be just about anything. When we were kids, he always created something surprising for us. Today, however, Dad would say no more, and caught up in the busyness of our new life , I eventually forgot about his surprise.

    Until one gloomy day the next March when I glanced out of the window，I saw a dot of blue across the yard. I headed outside for a closer look. They were crocuses (番红花）throughout the front lawn — blue, yellow and my favorite pink，with little faces moving up and down in the cold wind. I remembered the things Dad secretly planted last autumn. He knew how the darkness and dullness of winter always got me down. What could have been more perfectly timely to my needs?

    My father's crocuses bloomed each spring for the next five seasons, always bringing the same assurance: Hard times are almost over. Hold on, keep going, and light is coming soon.

    Then a spring came with the usual blooms but the next spring there were none. I missed the crocuses, so I would ask Dad to come over and plant new bulbs (植物球茎). But I never did. He died suddenly one October day. My family were in deep sorrow, leaning on our faith.

    On a spring afternoon four years later, I was driving back when I felt depressed. It was Dad's birthday, and I found myself thinking about him. This was not unusual — my family often talked about him, remembering how he lived up to his faith. Suddenly I slowed as I turned into our driveway. I stopped and stared at the lawn. There on the muddy grass with small piles of melting snow, bravely waving in the wind, was one pink crocus.

    How could a flower bloom from a bulb more than 18 years ago, one that hadn't bloomed in over a decade? But there was the crocus. Tears filled my eyes as I realized its significance.

    Hold on, keep going, and light is coming soon. The pink crocus bloomed for only a day, but it built my faith for a lifetime.

    The Internet plays a big part in human life. We use it for work and entertainment. We can find new recipes on the Interact or advice on staying healthy. We can even use it to learn a new language. We use the Internet to keep in contact with family and friends and stay in touch with issues we care about. The list goes on and on.

Well, there may be no going back to an Internet-free life. But can using the Internet too much be bad for our health? It might be, say researchers. A new study finds that heavy Internet use may be connected to high blood pressure in an unlikely group—teenagers. So, try to be a responsible guardian for your children.

    The study results show that teens who spend at least 14 hours a week online are more likely to have high blood pressure. High blood pressure makes your heart and blood vessels work too hard. Over time, this extra strain increases your risk of a heart attack or stroke. High blood pressure can also cause heart, kidney and brain diseases.

    The Henry Ford Hospital in Detroit, Michigan did the study. It involved 335 young people, from 14 to 17 years old. One hundred and thirty-four of the teens were described as “heavy Internet users”. Researchers found that out of these 134 teens, 26 had high blood pressure. The researchers say the study is the first one to connect heavy web use with high blood pressure. Another research has connected that heavy Internet use with health problems including anxiety, depression and obesity.

    The lead researcher of the study is Andrea Cassidy-Bushrow. For the purpose of the study, she explains, teens considered heavy Internet users were online on average “25 hours a week”. In a statement she said, “Using the Internet is part of our daily but it shouldn't consume us.”

    Ms. Gassidy-Bushrow adds that it is important for teens to take regular breaks from their computers or smart phones and to do some kinds of physical activities. She also suggests that parents limit their children's use of the Internet to two hours a day, five days a week.

    Have you ever lost your temper? Did you yell and scream or want to hit someone? If so, you are angry.

    Everyone gets angry. Maybe you “lose your cool” or “hit the roof.” Anger can even be a good thing. When kids are treated unfairly, anger can help them stand up for themselves. The hard part is learning what to do with these strong feelings.

    Don't lose control if you get angry. Taking it out on others never solves anything. Instead, admit to yourself that you are angry and try to figure out why. What can you do to keep the situation from happening again?

    It helps to talk about your anger with an adult, such as a parent, teacher, or relative. Once you talk about anger, those bad feelings usually start to go away.

Here are some other things you can do when you start to feel angry.

Talk to a friend you can trust

    Count to 10

    Get or give a hug

    Do jumping jacks or another exercise

    Draw a picture of your anger

    Play a video game

    Run around the outside of the house five times as fast as you can

Sing along with the stereo

    Pull weeds in the garden

    Think good thoughts (maybe about a fun vacation or your favorite sport)

    Take a bike ride, go skateboarding, play basketball —do something active!

    Never getting angry is impossible. Instead, remember that how you act when you are angry can make the situation better or worse. Don't let anger be the boss of you. Take charge of it!

    A tiny clue found in ancient deposits has unlocked big secrets about Greenland's past and future climate. Just beyond the northwest edge of the vast Greenland Ice Sheet, researchers have discovered lake mud that have survived the last ice age. The mud, and remains of common flies in it, record two interglacial periods(间冰期)in northwest Greenland.

    Although researchers have long known these two periods—the early Holocene and Last Interglacial—experienced warming in the Arctic, the mix of fly species shows that Greenland was even warmer than previously thought. "As far as we know, it has never been found in Greenland. We think this is the first time anyone has reported it in ancient deposits or modern lakes there," Axford said. "We were really surprised to see how far north it migrated (迁徙)."

    This new information could help researchers better measure Greenland's sensitivity to warming, by testing and improving models of climate and ice sheet behaviour. Those models could then improve predictions of how Greenland's ice sheet might respond to man-made global warming. After all, Greenland covers 80 per cent of the Arctic country and holds enough ice to equal 20 feet of global sea level. "Northwest Greenland might feel really remote, but what happens to that ice sheet is going to matter to everyone in every coastal city around the world," said Yarrow Axford, an associate professor in the team. "One of the big uncertainties in climate science is how fast the Earth changes when it gets warmer. Geology gives us an opportunity to see what happened when the Earth was warmer than today," said Axford.

    People might be surprised to see how today's Greenland looked during the last two interglacial periods. During the Last Interglacial, global sea levels increased by 15 to 30 feet, largely due to thinning of Greenland and Antarctica's ice sheets. However, now researchers believe northern Greenland's ice sheet experienced stronger warming than previously thought, which could mean that Greenland is more responsible for that sea-level rise.

    Finding lake deposits older than about 10,000 years, however, has been historically very difficult in Greenland. To measure these ancient temperatures, researchers look to ice cores (冰核) and lake deposits. Since ice and lake deposits form by a gradual buildup on annual layers of snow or mud, these cores contain history of the past. By looking through the layers, researchers can obtain climate clues from centuries ago.

The rolling out of 5G services has triggered a wave of competition across the world. More importantly, it has started a race to develop 6G as the telecommunications sector has always been a hotspot for competition.

Compared with 5G technology, 6G will have lower latency, higher speed and more bandwidth. And this advanced technology will help connect the real world with virtual digital world. It will also make product design R&D(Research and development) and experiments significantly more efficient and greatly reduce their costs while making it possible to produce digital products. In the physical world through high-tech, including 3D printing. The seamless and intelligent connection of the physical and digital worlds will lead to a thorough reconstruction of the division of labor and societal cooperation.

In terms of economic development, 3G fostered e-commerce while 4G boosted e-commerce and mobile payment. 5G infrastructure building and application marked the beginning of intelligent manufacturing. Similarly, wireless cognition technology associated with 6G technology, once it matures, will further boost the development of the digital economy. In digital economy, intelligence based on big data will become the real force for innovation and 6G networks not only will be highways for transmitting data, but will also much more seamlessly integrate edge and core computing as part of a combined communications. This will provide many potential advantages as 6G technology becomes operational, including access to AI capabilities. Digital economy based on 6G will become the determining factor of the country's competitiveness in the future, and 6G technology with wireless cognition as its major characteristic will become core technology and main driver of the digital economy.

Starting with 5G our telecom industry, thanks to its extensive R&D input, has taken the lead in standardizing and manufacturing 5G telecom equipment，the competition in 6G will start with the setting of standards, which will determine the level of R&D needed for the launch of the technology and thus decide the market share of the emerging industry . As far as R&D in 5G technology is concerned. We have already enjoyed two advantages. first, it is a global leader in the telecom sector and has a solid reserve of talents. And second, it has a relatively complete industrial chain that covers R&D and design, manufacturing and application. and is home to leading 5G equipment maker. Recent history shows whoever leads the telecom technology sector sets the standards for telecom products and services. and plays a bigger role in the industry's future development . An official research team on 6G including the government. enterprises and research organizations has been established to obtain the advantage of 6G development competition .