Having friends may well keep you healthier and help you deal with stress better. Some studies show that people with close friends have a greater ability to fight disease than people who are alone.

    Place friendship in the first place. Find the time to be with friends even if it means letting the lawn go unmoved or the dishes unwashed for a while. When you can't get together, use the phone to keep in touch.

    Open up to close friends. Keeping a deep friendship requires a level of “heartfelt” intimacy (亲密). Don't be afraid to express your inner fears and disappointments. Listen to your friends when they have problems, but offer advice only when it's wanted. Help raise friends' self-esteem when they are sad about a job loss, or other such events.

    Have different friends for different activities, such as going to the movies, singing in a choir, and joining in a bowling league.

    Don't wait for a friend to ask for helps. When a friend has the flu, offer to go to the store or drive his or her children to their after-school activities.

    Never take a friendship for granted. Like a good marriage, friendship needs care and patience. Become a joiner. Find a group that matches your interests.

    Talk to strangers. Conversations started in museums, laundry rooms, or bookstores can lead to firm friendship.

    Enroll in an adult-education course. A classroom is an ideal place to meet others with similar interests.

    David Lindenmayer of the Australian National University College of Science in Canberra says that older trees play important roles in maintaining landscapes and ecosystems.

    David studies conservation, landscape, ecology and biodiversity at the Australian National University College of Science in Canberra. “Lots of people recognize that as humans get older they tend to have less and less children while trees do it the other way around. What really happens is that the older some of these really big old trees get, the more seeds they produce and the more germinant（萌芽的）they're likely to be. So it's actually the polar opposite of what we see with humans and most other animals, so really quite extraordinary. “On January 26th he spoke to Scientific American Editor in Chief Mariette DiChristina when they were both at the World Economic Forum in Davos.

    In actually it's quite a worrying situation, because in plenty of forests and woodland and other ecosystems around the world, populations of large old trees are declining very quickly. And this matters because a lot of biodiversity, a lot of carbon, a lot of key ecosystem processes are associated with those really big, old trees.

    We can make sure we grow more forests, that we protect the big trees we have now, and that we don't do things that really put a lot of pressure on those trees. We should not be cutting down really big old trees anymore.

Londoners are great readers. They buy vast numbers of newspapers and magazines and of books — especially paperbacks, which are still comparatively cheap in spite of ever-increasing rises in the costs of printing. They still continue to buy "proper" books, too, printed on good paper and bound（装订）between hard covers.

    There are many streets in London containing shops which specialize in book-selling. Perhaps the best known of these is Charring Cross Road in the very heart of London. Here bookshops of all sorts and sizes are to be found, from the celebrated one which boasts of being "the biggest bookshop in the world" to the tiny, dusty little places which seem to have been left over from Dickens' time. Some of these shops stock, or will obtain, any kind of book, but many of them specialize in second-hand books, in art books, in foreign books, in books on philosophy, politics or any other of the countless subjects about which books may be written. One shop in this area specializes only in books about ballet!

    Although it may be the most convenient place for Londoners to buy books, Charring Cross Road is not the cheapest. For the really cheap second-hand books, the collector must venture off the beaten track, to Farringdon Road, for example, in the East Central district of London. Here there is nothing so impressive as bookshops. The booksellers come along each morning and pour out their sacks of books onto small hand carts. And the collectors, some professionals and some amateurs, have been waiting for them. In places like this they can still, occasionally, pick up for a few pence an old one that may be worth many pounds.

    How many times do you check your Facebook page in a day to see whether your latest post has got another “like” or “thumbs(拇指) up”?

    Although you might be embarrassed to admit how many times you do this, don't worry—psychological findings have shown it's completely normal. In fact, the pleasure we derive from receiving a “like” is equal to that of eating chocolate or winning money, and we can't help wanting more. According to the findings, which observed 32 teens aged between 13 and 18, the feedback circuit (反馈回路) in the teens' brains is particularly sensitive, and the “social” and “visual” parts of their brains were active when they received “likes” on the social network. The research also showed that though the thumbs up might come from complete strangers, the good they derive from them worked all the same.

    So, does it mean we should try our best to win as many thumbs up as possible? Not necessarily so if we know the reasons behind our desire for attention. In “why do people long for attention” by M. Farouk Radwan, he explained several cases in which people naturally longed for attention. Radwan said people who were an only child, who were used to being the center of attention in their house, may try to copy these conditions. Feeling “overlooked and unappreciated” might also lead you to long for attention. Other times, the state of being jealous, or wanting to cover your mistakes may also contribute to such longings.

    In fact, too much desire for attention can create anxiety, and in turn ruin your happiness even when you get it. So what can we do about it? The answer is quite simple. “If people could adopt goals not focused on their own self-esteem（自尊）but on something larger than their self, such as what they can create or contribute to others, they would be less sensitive to some of the negative effects of pursuing self-esteem,” wrote psychology professor Jennifer Crocker.

    So perhaps the answer to our addiction to “likes” is simply to focus on something larger than ourselves—a hard, but a worthy one.

    You'll need to take a deep breath before hearing this news. An astonishing 93% of kids around the world live in environments with air pollution levels that are damaging their health, according to a new report by WHO.

    Air pollution is to blame for the deaths of 543, 000 kids under 5 in 2016, with more than one in four deaths of children under five years old being related to environmental issues. Exposure (暴露) to air pollution can damage the health of kids in a variety of ways, either causing or being associated with everything from low birth weight to childhood obesity and so on.

    "The large toll of disease and death revealed (揭示) by these new data should result in an urgent call to action for the global community especially for those in the health department WHO stated. "Strong action to reduce exposure to air pollution offers an opportunity to protect the health of children." The report stressed that health experts should communicate with families, communities and policy-makers about the serious risks of air pollution exposure. "Although more researches into how air pollution affects children's health will continue to be valuable, there is already evidence to justify strong, swift action to prevent the damage it clearly produces," WHO added.

    Disease caused by dirty air is more common in low-and-middle in some countries, especially those in Africa, South-East Asia, and Western Pacific regions. Poor countries in these areas have the highest levels of exposure to household air pollution due to the use of polluting fuels and technologies for basic needs like cooking, heating and lighting.

    Advised solutions include cleaner transport, cleaner cooking and heating fuels and technologies energy-efficient housing and urban planning, safer industrial technologies and better waste management.

    To find out how the name Canada came about we must go back to the 16th century. At that time, the French dreamed of discovering and controlling more land, of expanding(扩大) trade beyond their borders and of spreading their beliefs across the world. In 1535, Francois I, king of France, ordered a navigator(航海家) named Jacques Cartier to explore the New World and search for a way to India.

    Carrier first arrived at the gulf of the St. Lawrence, which he intended (打算) to explore. He did not know what to expect but he hoped that this gulf was just an arm of the ocean between two islands. If it was, he would soon be on his way to the Far East. So he sailed upstream along the St. Lawrence River. However, instead of reaching Asia he arrived at Quebec or Standalone, as the Indians called it. It was at this point that the term "Canada" entered the country's history. Apparently the word "Canada" came from an India word" kanata", which means community or village. Cartier first used it when he referred to Standalone or Quebec. What a huge "village" Canada is!