Their cheery song brightens many a winter's day. But robins are in danger of wearing themselves out by singing too much. Robins are singing all night一as well as during the day, British-based researchers say.

    David Dominoni, of Glasgow University, said that light from street lamps, takeaway signs and homes is affecting the birds' biological clocks, leading to them being wide awake when they should be asleep.

    Dr Dominoni, who is putting cameras inside nesting boxes to track sleeping patterns, said lack of sleep could put the birds' health at risk. His study shows that when robins are exposed to light at night in the lab, it leads to some genes being active at the wrong time of day. And the more birds are exposed to light, the more active they are at night.

    He told people at a conference, "There have been a couple of studies suggesting they are increasing their song output at night and during the day they are still singing. Singing is a costly behaviour and it takes energy. So by increasing their song output, there might be some costs of energy."

    And it is not just robins that are being kept awake by artificial light. Blackbirds and seagulls are also being more nocturnal. Dr Dominoni said, "In Glasgow where I live, gulls are a serious problem. I have people coming to me saying `You are the bird expert. Can you help us kill these gulls?'.During the breeding(繁殖)season, between April and June, they are very active at night and very noisy and people can't sleep."

    Although Dr Dominoni has only studied light pollution, other research concluded that robins living in noisy cities have started to sing at night to make themselves heard over loud noise.

    However, some birds thrive(兴旺)in noisy environments. A study from California Polytechnic University found more hummingbirds in areas with heavy industrial machinery. It is thought that they are capitalising on their predators(天敌)fleeing to quieter areas.

    Are you the type of person who always says “yes”? I've come to learn that it is very important to learn to say NO! It's okay. People are still going to like you. They may even respect you more because they know you are honest.

    I'm not saying to say “no" to someone who really needs your help. I'm talking about refusing that meeting that you really do not want to attend or that birthday party that you don't want to be a guest at.

    Think for a moment how you feel when you say YES to something that you really don't want to do. If you're like I once was，you can't sleep at night and you think about it too much. It weighs on your mind. You try to find ways out. Whatever you're saying to yourself, if you really wanted to go, you wouldn't have all of these thoughts.

    So, why not just say NO from the beginning? Maybe you feel like if you don't show up at the meeting (by the way, it is not one you must attend) your boss isn't going to like you or your co-workers won't respect you. Maybe you feel as if your mom, dad or sisters won't love you as much if you don't do everything for them that they ask every occasion.

    If these people are your true friends, family members, or a good boss, they will like or love you the same no matter what. People treat you the way you usually use, and if you're someone who always says “yes” then that's what they're expecting.

You need to do what is right for you. Of course we do have real responsibilities in life to do, but we do not have to do everything others want us to do.

    Katie was in big trouble. She was such a sweet kid; a third­grade teacher always dreamed of having a classroom filled with Katies; she has never had a discipline(纪律) problem. I just couldn't imagine why she had made her parents so angry.

    It seemed that Katie had been running up sizable charges in the lunch room. Her parents explained that Katie brought a great homemade lunch each day, and there was no reason for her to buy school lunch. They assumed a sit­down with Katie would solve the problem, but failed. So they asked me to help them get to the bottom of this situation.

So the next day, I asked Katie to my office."Why are you charging lunches, Katie? What happened to your homemade lunch？" I asked. "I lose it，" she responded. I leaned back in my chair and said, "I don't believe you, Katie." She didn't care." Is someone stealing your lunch, Katie？" I took a new track. "No. I just lose it." she said. Well, there was nothing else I could do.

The problem was still unsolved the next week when I noticed a boy who was new to the school sitting alone at a lunch table. He always looked sad. I thought I would go and sit with him for a while. As I walked towards him, I noticed the lunch bag on the table. The name on the bag said " Katie " .

    Now I understood and I talked to Katie. It seemed that the new boy never brought a lunch, and he wouldn't go to the lunch line for a free lunch. He had told Katie his secret and asked her not to tell anyone that his parents wanted him to get a free lunch at school. Katie asked me not to tell her parents, but I drove to her house that evening after I was sure that she was in bed. I had never seen parents so proud of their child. Katie didn't care that her parents and teacher were disappointed in her. But she cared about a little boy who was hungry and scared.

    Katie still buys lunch every day at school. And every day, as she heads out of the door, her mom hands her a delicious homemade lunch.

    BEIJING (News Agency) — Children in China today spend five times more money than their parents did when they were young.

    So what are all these children buying? The list is long: iPads, cell phones and jeans are typical items that children “have to” buy. And they will do anything to get them. They ask their parents over and over until they buy them.

    But parents also need to take the blame(责备) for spending so much money. They want their children to have the best things. They end up competing with other parents over whether their children have the latest products.

    So it's no wonder children find it hard to learn the importance of saving money rather than spending it all the time.

    And it's hard to save when companies use advertising (打广告)and clever slogans (口号) to encourage young people to buy their products. They even encourage children to keep asking their parents for something until they get it.

    Today, you don't even need to have money in order to buy something. Banks give out credit cards and loans (贷款) all the time, so people are saving less and less. We are used to carrying lots of money around. And if you don't have much, you can always borrow some.

    But this hasn't always been the case. When our grandparents were young, there was very little money and everyone had to save hard for things they bought. They only bought things they needed, not things they just wanted.

    The older generation made the wise expression, “Money doesn't grow on trees.” This is as true now as it was 50 years ago. They give money a great deal of value. And we all have a lot to learn from them.

    In China we can see more African students in universities, which is a signal of a deeper China-Africa relationship, and the same trend is happening in Africa as well. Most Chinese students choose to study in universities in South Sudan, Egypt, Kenya, Ghana, Ethiopia and South Africa.

    There are three types of Chinese students in Africa. One type is language students who major in local African languages such as Swahili in China and go to African countries to study the language. Another type is non-language students who major in law, economy, culture, education or agriculture and go to African universities for six months to a year to learn more about the culture or for research. The above two types of students are all funded by Chinese government.

    A third type has been growing in recent years. More Chinese choose to develop their career and build a life in African countries, and some of their children tend to receive higher education in African countries. Some Chinese who work in Africa also further their study in their free time. Many Chinese choose to join the MBA program, since they work in a Chinese state-owned enterprise, and an MBA degree could help advance their career.

    In addition, as China and Africa's relations and cooperation are heating up and more Chinese companies and investors come to Africa under The Belt and Road Initiative(一带一路), more talents that understand Africa are needed. Besides, the new generations have more internationalized, curious attitudes, and are more willing to see and experience Africa themselves without any stereotypes(刻板印象), rather than just reading about it in a textbook.

    Tourism is often about seeking deeper emotional and personal connections with the world around us. Not all travel experiences, however, need to take place in the real world. With the evolution of virtual reality (VR) technology, tourism will increasingly become a combination of physical and virtual worlds. VR may even remove the need to travel entirely.

    But can a VR experience really equal a real world one? Many experts believe it can. Studies have shown that our brains have an inbuilt VR-like mechanism that enables us to live imagined experiences. Much of our waking life is spent thinking about either the past or the future. This is known as" mind wandering". During these events we're not paying attention to the current world around us. Instead, we're recalling memories, or creating and processing imagined futures.

    When engaged in mind wandering, our brains process these mental images using the same pathways used to receive inputs from the real world. So, the imagined past or future can create emotions and feelings similar to how we react to everyday life. VR can create these same feelings.

    While critics might argue that a virtual experience will never match reality, there are several ways VR tourism could make a positive contribution. Firstly it could help protect sensitive locations from over-tourism. In recent years famous sites such as Maya Bay in Thailand, and Cambodia's Angkor Wat Temples have had to limit the number of visitors because of their negative impact. These places are now producing their own VR experiences that will allow tourists to pass through virtual models of the sites.

    Virtual reality may also allow people back in time, to experience historical events, visit ancient cities, and even to walk among dinosaurs.

    Finally, in a world where many people suffer from stress and depression due to overwork, virtual tourism may provide a cheap and convenient way for people to take brief holidays to otherwise unreachable destinations and recharge their batteries, without ever leaving their homes.

    It sounds like science fiction but it's already happening. As virtual technology improves and as people continue to demand new and interesting experiences, expect more virtual tourism, both in combination with the real world and instead of it.