Last week, we talked about the conflict(冲突) between sleepy teenagers and early morning classes. Many people commented(评论) on our website.

For example, Damla Ece in Turkey wrote: I agree with the idea of starting lessons later so teenagers can feel better in the morning. But sleeping more than seven hours can be wasting time for students.

    Tran in Vietnam disagreed: I think teenagers, on average, need eight to ten hours of sleep every day. It's useless to try to force them to concentrate while they can't concentrate.

    Afshin Heydari from Iran wrote: schools should start early to avoid heavy traffic later in the morning.

    And Suze from Jordan wrote: When I was a teenager, I enjoyed taking my courses as early as possible. That way I could find a long time in the day to do my own activities.

    But Azra from Kyrgyzstan said: the reason why schools start early here is a lack of classrooms.

    And Joruji in Japan wrote: When I was a teenager, I used to get up before six to go to school, which was far from home, and I don't remember having problems. I think nowadays the Internet, TV games and cell phones make teens go to sleep later.

    Thirty-year-old Kika in Spain said: In my opinion, young people are very lazy.

    But Dennis Jin disagreed: For high school students in China, we must reach the classroom at 6:20 in the morning and be back home usually at 10:00 in the evening. Then we'll have some extra schoolwork to do. Can you imagine how long we could sleep every day?

    Teenagers are not the only ones who suffer. Kathy in Canada wrote: My daughter likes complaining about everything in the morning, and I know that this is from lack of sleep. I wish schools should change their start time to 8:30 or 9:00 in the morning.

    And Naima Star in Libya wrote: Getting up so early in the morning and leaving the warm bed is so difficult, especially in the cold weather. It reminds me of that old song: "It's nice to get up in the morning, but it's nicer to stay in bed."

    Discovering Tasmania

    The island of Tasmania a place of natural beauty and has more than 2,000 km of walking tracks and 18 national parks. If you go on a tour, you'll discover a wild and beautiful place where the people are friendly and the food is delicious. If you don't like walking, there are other tours you can choose from including a river cruise(巡游) and cycling. You can also enjoy fishing, sailing or sunbathing on the beach.

    The Tarkine coast is located in the northwest of Tasmania. It's such a wild and remote(偏僻) area that you can easily complete your walk without seeing anyone apart from the members of your group and your two guides. The area contains the largest rainforest in Australia which is home to more than 50 endangered species. It is also home to many Aboriginal Heritage Sites. During your tour, you'll come across rivers, mountain ranges, waterfalls, wildlife and long wild beaches.

    Tour Itinerary：

    Day 1：

    You're picked up from your hotel in Launceston and driven to the Tarkine. You then complete a three­hour walk through the forest before arriving at your camp at Mystery Creek. There you will enjoy a delicious meal cooked by your guides.

    Day 2：

    After breakfast, you continue deeper into the rainforest, passing some of the tallest trees in the world as you go, and stopping for lunch and then camp in the evening.

    Day 3：

    The exciting part of today's tour is the Tarkine Falls, a beautiful 15­metre waterfall.

    Day 4：

    You can stay at the camp and bathe in the Tarkine Falls, or you can go for a walk for more fantastic views of the forest.

    Day 5：

    After a last journey through the forest, you are picked up at about 4：00 p．m. and you arrive in Launceston at around 7：00 p．m.

    The tour includes two professional guides, transport to and from the rainforest, all food while on the tours and all safety equipment. You should buy or hire(租用) recommended camping equipment including: backpacks, sleeping bags, rain coats and trousers.

    Wellington: Huawei has started a rugby-themed media campaign in a bid to win over New Zealand's public after the country's security agency blocked the Chinese technology giant's equipment from being used in a nationwide Internet network.

    "5G without Huawei is like rugby without New Zealand," ads in New Zealand's two largest newspapers read alongside a photo of players competing in a ball. Large posters also appeal to the country's love of the sport. In November, New Zealand's Government Communications Security Department (GCSD) told Spark it couldn't use equipment from Huawei-the world's largest telecommunication equipment company—in the building of its 5G network because an unspecific "significant network security risk was identified". Spark is now in the process of seeing if it can make changes to prevent those risks, although GCSD has declined to publicly say how that would happen.

    Huawei's newspaper ad goes on to argue the decision would mean less advanced technology and higher prices for New Zealand customers. The ads come after the company last month publicly offered to only use New Zealand, rather than Chinese, staff to build the network—in a bid to ease fears—and called for an urgent meeting with the government, denying (否认) there had been any wrongdoing.

    Western spy agencies have increasingly raised security concerns about Huawei—China's largest telecommunications company-over what they say are possible links to the Chinese government, with the United States reportedly pressing Five Eyes intelligence network allies (同盟国) to avoid the company. Australia and Canada were the first countries to ban Huawei from a building of 5G networks.

The company has repeatedly denied accusations.

    New Zealand's top politicians have repeatedly denied the GCSD decision was influenced by other Western powers and say it's about the particular technology being suggested, not China. They have also denied suggestions New Zealand's diplomatic ties with China have been tense over the decision, with the official promotion of a major China—New Zealand tourism project now postponed.

    Are you afraid of going to the dentist(牙医)? If so, you're not alone.

    These fears could just be in our heads, however. According to a recent survey by Martin Tickle, a professor at the University of Manchester in the UK, the pain isn't felt most of the time in dental surgeries(牙科手术). In fact, among the 451 interviewed patients, 75％reported no pain at all during their visits, including situations when they had their teeth pulled out.

    Could it be the sound of the drill(钻头)then?

    "I found that the sound of drilling can evoke deep worry in dental patients. Actually they don't have any pain, "Hiroyuki Karibe, a scientist at Nippon Dental University in Tokyo, told The Guardian.

    To find the reason why a drill might bring on a racing heart, Karibe divided the volunteers into low-fear and high-fear groups based on how much they feared a trip to the dentist. Volunteers were played the sound of a drill while their brain activities were watched by a machine.

    What Karibe found in the low-fear group was increased activity in the areas of the brain relative to auditory processing(听觉处理), which means, for these people, the sound of dental drills is no different from other sounds.

    In the high-fear group, however, the brain area that was activated(激活)was different. It was the area that carries out a number of duties, including learning, feelings and, most importantly, memory. This means that these volunteers not only heard the sound, but they remembered it—they made connections between the sound of a drill and the worry it produced in the past, causing their worry to return.

    Understanding how brains reply to the sounds of dentists' drills could help scientists find ways to make patients more relaxed, according to Karibe, because patients who worry about going to the dentist might keep putting off their visits. But the best way is to keep your teeth healthy.

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