Tina and Mark noticed similar changes in their 14-year-old daughter. “She used to cuddle up (蜷伏)with me on the sofa and talk,” said Mark. “Now we joke that she does this only when she wants something. Sometimes she wants to be treated like a little girl and sometimes like a young lady. The problem is figuring out which time is which. ”

    Before age 11, children like to tell their parents what's on their minds. “In fact, parents are first on the list.” said Michael Riera, author of Uncommon Sense for Parents with Teenagers. “This completely changes during the teen years.” Riera explained. “They talk to their friends first, then maybe their teachers, and their parents last.”

    Parents who know what's going on in their teenagers' lives are in the best position to help them. To break down the wall of silence, parents should create chances to understand what their children want to say, and try to find ways to talk and write to them. And they must give their children a mental break, for children also need freedom, though young. Another thing parents should remember is that to be a friend, not a manager, with their children is a better way to know them.

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    Here are four wonderful hotels and campsites in Europe.

    Ekies All Senses Resort, Chalkidiki, Greece

    This could be the perfect retreat for stressed parents who need spoiling. For a start, it's in lovely Greece, but there's no need to take a ferry, as it's on the mainland. With a juice bar beside the(heated)pool, open-air spa, calm beach, restaurants or meals on demand, and secret bays to explore by boat, it makes for a super-relaxed break.

    Doubles from € 88, junior suite(sleeps 4)from €138 a night, family suite(sleeps6) from €272 B&B, open late

    April-October, i-escape.com

    Casa Vicentina, Algarve, Portugal

    For a back-to-nature feel, family-run Casa Vicentina in the Algarve is perfect. Built with ecological materials, it's in a protected park area on a natural lake. Breakfast is a plentiful buffet-and bikes are supplied free of charge so you can go to the beach or cafes and restaurants. Accommodation is in brightly decorated rooms or larger suites complete with small kitchens.

    Rooms from €75 B&B, wonderfulland. Com

    Fairy Chimney Inn, Cappadocia, Turkey

    Older kids will love the fairytale landscape of Cappadocia and the excitement of staying in a cave hotel. The Fairy Chimney Inn used to be part of a cave monastery(修道院). Its rooms are beautiful and homely, with traditional decorations and the occasional reminder of the modern world. All rooms have courtyards overlooking the  extraordinary landscape.

    Rooms from €55 B&B, plus 11 per child, fairychimney. Com

    Casa San Gabriel, Umbria, Italy

    Casa San Gabriel is a small hilltop farm where three self-catering cottages share a swimming pool, playground and barbecue. There's added excitement for young guests in the family of alpacas(羊驼)kept on site. There are several water, wildlife and activity parks nearby, and slightly further afield a Pinocchio theme park.

    A week at II Fienile cottage (sleeps 4-6)costs from €650, B&B (low season only) from €95, casasangabriel. com

    Humans and many other mammals have unusually efficient internal temperature regulating systems that automatically maintain stable core body temperatures in cold winters and warm summers. In addition, people have developed cultural patterns and technologies that help them adjust to extremes of temperature and humidity (湿度).

In very cold climates, there is a constant danger of developing hypothermia, which is a life-threatening drop in core body temperature to below normal levels. The normal temperature for humans is about 37.0℃. However, differences in persons and even the time of day can cause it to be as much as 6℃ higher or lower in healthy individuals. It is also normal for core body temperature to be lower in elderly people. Hypothermia begins to occur when the core body temperature drops to 34.4℃. Below 29.4℃, the body cools more rapidly because its natural temperature regulating system usually fails. The rapid decline in core body temperature is likely to result in death. However, there have been rare cases in which people have been saved after their temperatures had dropped to 13.9-15.6℃. This happened in 1999 to a Swedish woman who was trapped under an ice sheet in freezing water for 80 minutes. She was found unconscious, not breathing, and her heart had stopped beating, yet she was eventually saved despite the fact that her temperature had dropped to 13.7℃.

In extremely hot climates or as a result of uncontrollable infections, core body temperatures can rise to equally dangerous levels. This is hyperthermia. Life-threatening hyperthermia typically starts in humans when their temperatures rise to 40.6-41.7℃. Only a few days at this extraordinarily high temperature level is likely to result in the worsening of internal organs and death.

    For all the pressures and rewards of regionalization (地区化) and globalization, local identities remain the most deeply impressed. Even if the end result of globalization is to make the world smaller, its scope seems to foster the need for more private local connections among many individuals. As Bernard Poignant, mayor of the town of Quimper in Brittany, told the Washington Post, "Man is a fragile animal and he needs his close attachments. The more open the world becomes, the more ties there will be to one's roots and one's land."

    In most communities, local languages such as Poignant's Breton serve a strong symbolic function as a clear mark of "authenticity (原真性)". The sum total of a community's shared historical experience, authenticity reflects a noticeable line from a culturally idealized past to the present, carried by the language and traditions associated with the community's origins. A concern for authenticity leads most secular (世俗的) Israelis to defend Hebrew among themselves while also acquiring English and even Arabic. The same obsession with authenticity drives Hasidic Jews in Israel or the Diaspora to champion Yiddish while also learning Hebrew and English. In each case, authenticity amounts to a central core of cultural beliefs and interpretations that are not only resistant to globalization but also are actually reinforced by the "threat" that globalization seems to present to these historical values. Scholars may argue that cultural identities change over time in response to specific reward systems. But locals often resist such explanation and defend authenticity and local mother tongues against the perceived threat of globalization with near religious eagerness.

    As a result, never before in history have there been as many standardized languages as there are today: roughly 1,200. Many smaller languages, even those with far fewer than one million speakers, have benefited from state-sponsored or voluntary preservation movements. On the most informal level, communities in Alaska and the American northwest have formed Internet discussion groups in an attempt to pass on Native American languages to younger generations. In the Basque, Catalan, and Galician regions of Spain, such movements are fiercely political and frequently involved loyal resistance to the Spanish government over political and linguistic rights. Projects have ranged from a campaign to print Spanish money in the four official languages of the state to the creation of language immersion nursery and primary schools. Zapatistas in Mexico are championing the revival of Mayan languages in an equally political campaign for local autonomy.

    In addition to causing the feeling of the subjective importance of local roots, supporters of local languages defend their continued use on practical grounds. Local tongues foster higher levels of school success, higher degrees of participation in local government, more informed citizenship, and better knowledge of one's own culture, history, and faith. Government and relief agencies can also use local languages to spread information about industrial and agricultural techniques as well as modern health care to diverse audiences. Development workers in West Africa, for example, have found that the best way to teach the vast number of farmers with little or no formal education how to sow and rotate crops for higher yields is in these local tongues. Nevertheless, both regionalization and globalization require that more and more speakers of local languages be multi-literate.

    Almost every second of every day an older adult falls in the United States. That's approximately 29 million falls per year and nearly 27, 000 deaths, according to the Centers for Disease Control and Prevention.

    Still in the stating stage, the Active Pelvis Orthosis (APO) system in Switzerland wants to make a lightweight, wearable exoskeleton (外骨骼) that could detect signs of balance loss and assist with balance recovery to keep the elderly wearer from falling, only when needed.

    Other exoskeletons, either in development or on the market today, assist with movement and make heavy objects feel lighter. Mobility-impaired people can walk again. But none of these devices predict what the wearer is going to do next and take measures to correct an unsteady move.

    The 3 kilogram (6.7 pound) exoskeleton was built entirely from scratch by the research team and is designed to be worn on the lower half of the body. A waistband connects to two movable carbon fiber braces (支架), each one positioned on the outer side of a leg. Tiny motors and so-called "adaptive oscillators" (适配振荡器) in the computer circuits use a special process to detect the, wearer's unique paces. That part takes just a few minutes.

    While wearing the exoskeleton, a person may feel the braces and the motors pushing slightly on their legs. If their paces go against normal, the motors create a force in the braces that cause them to stiffen up and push a little more strongly against the legs, which provides stability.

    In the next three years, the APO hopes to develop something that is commercially available.

    Last summer, after finishing my work in China, I took the trip of a lifetime on the Trans-Siberian Railway (西伯利亚铁路). Leaving Beijing early on a Wednesday morning in July, my wife and I travelled through some awesome (令人惊叹的) countryside before we arrived in Moscow the following Monday.

    The first part of the journey took us past the Great Wall and through the grasslands of Inner Mongolia. At the Mongolian Republic border, we had a delay(耽搁)while the wheels were changed because the railway is different.

    On our way to the capital, Ulan Bator, we saw herdsmen (牧人) on horseback looking after their cattle. There was a great thunderstorm as we crossed a vast open plain. Later we had a quick tour of Ulan Bator.

    Next, the train took us into Siberia. After a stop at Irkutsk, a popular holiday resort(度假胜地), where a tour group left the train, we passed the great Lake Baikal. Later, we saw some lovely wooden houses in pretty, sunny countryside. This surprised us, as we had imagined Siberia as being covered with thick snow.

    Over the next few days, we passed through Novosibirsk, Omsk and other cities in the heartlands of the Russian Federation. By now, our body clocks were losing their sense of time. We wanted to sleep and eat at the wrong time!

    At last we reached Moscow. We were so tired that we slept for 16 hours that night. The next day we went sightseeing. We saw the Dremlin and some other magnificent (宏伟的) buildings in the Russian capital. Then, all too soon, it was time for us to return to our home in London.