The English language has a lot of words which can be used in many different ways and in many different expressions.

    One such example is the word matter. In fact, matter can mean just about anything. It could be one of the most useful words in the English language.

    Let's get to the heart of the matter —a matter of principle(原则).

    If someone says that you owe(欠) him $50, but you don't, a friend might say, “Well, you could pay him the $50. It's not that much money. Then you won't have to hear him say it anymore. But if you do not owe him the money, do not pay him the money. It's a matter of principle.

    There is another way to use the word matter. But be careful with your choice of words.

    If you ask someone, “What's the matter?”, it shows you are worried about the other person. But saying, “What's the matter with you?” has a completely different meaning. And it usually sounds rude (粗鲁的). In fact, when you say, “What's the matter with you?” you are suggesting that the person did something wrong or stupid.

    Another expression that could sound rude is to say, “It doesn't matter to me.” Here, it depends on the context, and how you say it.

    Let's say you tell someone that a friend just got a big raise at work. That person answers with, “It doesn't matter to me.” Here, it means he or she does not care. And it sounds rude.

    But saying, “Oh, you pick where we eat dinner. It doesn't matter to me.” does not sound rude. In this situation, “it doesn't matter” shows you are easy-going(随和的).

    No matter how you look at it and what you say, matter is a very useful word. And it's only a matter of time before you will become an expert on the use of matter.

    A professor from the University of Georgia is allowing students to choose their own grades to reduce their stress and to walk out of any class if they don't like “the group dynamics.” If the professor were to write a book outlining this educational philosophy（教育理念）, what could it be titled? Would you like to write down your possible title and then send an email to us?

    How to enter:

    Submissions should be emailed to contest@theweek.com.

    Please include your name, address, and daytime telephone number; this week, please type “No stress” in the subject line.

    Entries are due by noon, Eastern Time, Tuesday, Aug. 29.

    In the case of similar entries, the first one received gets credit. All entries become property of The Week.

    Winners will appear on the Puzzle Page on the Sept. 8 issue and at the week.com/ puzzles on Friday, Sept. 1.

    What to win:

    Winners will get a chance to discuss some topics they care about face to face with the professor. They will also be given a book from the professor.

    Winners will get a one-year subscription（订阅）to The Week. They will receive 4 free issues first. They'll also get 46 more for a total of 50 in all for just $ 1. 39 per issue! They'll receive instant access to the digital edition. If you're not completely satisfied, just cancel it and any trial issues you receive are yours to keep.

    I'm a reporter. Last month I was in Stockholm, Sweden. Now I'm in Frankfurt, Germany. Next month, who knows?

    You certainly won't believe that I can call you from my laptop, which is what I'm often doing these days using something called Skype.

    Skype lets me call any phone number anywhere in the world for about 2 cents a minute, a little more to some places, such as the Middle East and Asia. My computer does the dialing, and the processing of incoming and outgoing voices. All you need is a broadband connection (宽带接头). With the basic version of Skype, all anyone needs to make or receive a call is to install the program on his or her computer (and that includes personal digital assistants). All calls from PC to PC are free.

    You don't even need a pair of headphones, though headphones can be a good idea if you wish to be discreet. I use my laptop's built-in microphone.

    The paid service for calling regular telephones is called SkypeOut. The quality is completely clear, provided that there's not too much traffic on the Internet. If there's an echo, hang up and try again, and it usually gets better. There is one warning: on some computers, especially those running older versions of Windows, it doesn't always work, or can sound like a confusing conversation. You can't hear a thing.

    Skype was invented chiefly by a Swede named Niklas Zennstrom along with a group of programmers in Estonia.

    Experts say there are about 6, 500 languages spoken throughout the world. But the United Nations estimates that about half of these languages are in danger of disappearing.

    One non-profit organization seeking to save world languages is a New York-based group called Wikitongues. Officials from Wikitongues say the organization has a simple goal: to provide the tools and support that people need to save their languages.

    Udell is the co-founder of Wikitongues. He said when a language disappears, many other things can go away as well. For example, parts of a community's culture, knowledge and identity can also be lost. Because of this. Udell believes the process of bringing languages back must be done by community members themselves, “from the ground up,” he said.

    “There is no way an outside organization can save someone's language for them.”

    Wikitongues was launched in 2016 as an open internet collection of world languages. The self-described “community” is operated by volunteers from around the world. The collection is in the form of language videos that people add to the Wikitongues website.

    There are currently more than 400 languages and dialects represented on Wikitongues' YouTube channel. Udell says more than 1,500 people from 70 different countries have added videos to the system.

    “We have people from India who record dozens of languages, which is beyond their own.” he said.

    One of Wikitongues'volunteers is Kolokwe, who lives in Namibia. His native language is Subiya, however, he does not get the chance to speak his native language every day. Like many other educated people from his area, he speaks a lot of English and Afrikaans.

    Kolokwe is hoping his involvement with Wikitongues call help keep Subiya and other African languages from going extinct. He wants the world to know about his language. But his goal goes beyond just sharing his language with others through video. He is also working to create a dictionary and language teaching materials that can be used in schools.

    A scientist working at her lab bench and a six-old baby playing with his food might seem to have little in common. After all, the scientist is engaged in serious research to uncover the very nature of the physical world, and the baby is, well, just playing…right? Perhaps, but some developmental psychologists have argued that this "play" is more like a scientific investigation than one might think.

Take a closer look at the baby playing at the table. Each time the bowl of rice is pushed over the table edge, it falls in the ground—and, in the process, it belongs out important evidence about how physical objects interact; bowls of rice do not flood in mid-sit, but require support to remain stable. It is likely that babies are not born knowing the basic fact of the universe; nor are they ever clearly taught it. Instead, babies may form an understanding of object support through repeated experiments and then build on this knowledge to learn even more about how objects interact. Though their ranges and tools differ, the baby's investigation and the scientist's experiment appear to share the same aim(to learn about the natural world ), overall approach (gathering direct evidence from the world), and logic (are my observations what I expected?).

Some psychologists suggest that young children learn about more than just the physical world in this way—that they investigate human psychology and the rules of language using similar means. For example, it may only be through repeated experiments, evidence gathering, and finally overturning a theory, that a baby will come to accept the idea that other people can have different views and desires from what he or she has, for example, unlike the child, Mommy actually doesn't like Dove chocolate.

Viewing childhood development as a scientific investigation throws on how children learn, but it also offers an inspiring look at science and scientists. Why do young children and scientists seem to be so much alike? Psychologists have suggested that science as an effort —the desire to explore, explain, and understand our world—is simply something that comes from our babyhood. Perhaps evolution provided human babies with curiosity and a natural drive to explain their worlds, and adult scientists simply make use of the same drive that served them as children. The same cognitive systems that make young children feel good about feel good about figuring something out may have been adopted by adult scientists. As some psychologists put it, "It is not that children are little scientists but that scientists are big children."

A mix of anxiety rising in my chest and a voice at the back of my mind shouting ‘what's wrong with me?'-it's how I've felt about rejection my whole life.

 The earliest rejection I can remember was on my first day of school. I started the term late due to illness and the teacher asked the class who would play with me at break. The silence was deafening. Now, a bit of online dating sees us rejected by half the town before we've even started our day. There's not a break at work. Is there a worse feeling than hitting the final slide on your presentation, boldly asking 'any questions?' and looking around the room to see everyone on their phones?

We need to build resilience. For me, this has come in two stages. First, I spent time listening to the voice of fear that saw each rejection as proof that there was something wrong with me. When I analysed it, I could see it was rarely about me. Perhaps the guy I was talking to was too busy to reply. It was likely that the magazine I'd sent a passage to already had an article on that topic. Now, I assume it's about me 20 per cent of the time-and I can live with that.

 The other thing I do is practice rejecting. Because I hate rejection, I shy away from being the rejector, which means I either please people or avoid tricky situations. Instead, I've come up with a few lines for when I want to say no: 'That sounds great but it's not for me; thank you for asking but I decline; it was lovely but I think we should leave it there.' It's never pleasant to reject a person but there is a kind way to do it. With resilience and clarity, we can see the plus sides of rejection: it frees us up to do something else, be with someone else and be happier. We can't complain about that.