Have you ever noticed what happens to an idea once you express it? Just talking about it or writing it down causes you to make it clear in your own mind. How can you use this to increase your brain power? Start writing.

    By putting thoughts into words, you are telling yourself the logic (逻辑) behind what you think, feel, or only partly understand. Often, explaining a thought is the process of understanding. In other words, you increase your brain power by exercising your “explain power.”

    Try this experiment. Explain how you'll increase your brain power, even if you have no idea right now. Just start with anything, and create an explanation. For example, start with “I'll learn chess,” or “I'll read an article on the mind every week.” Explain how that will help. You'll be surprised how often this becomes a workable plan, and if you actually do this, you'll have a better understanding of your brain from now.

    Another benefit of writing is that it helps you remember. Many, if not most, highly productive people are always taking notes. You can try keeping it all in your head, but if you keep a journal of your ideas the next time you're working on a big project, you'll probably have more success.

    Want to understand a topic? Write a book about it. That's an extreme example, but if you are learning something new, write a letter to a friend about it, and you will understand it better. Want to invent something? Write an explanation of the problem, why you want to solve it, and why it is worth solving, and you're half-way there.

    Writers don't always write because they clearly understand something beforehand. Often, they write about something because they want to understand it. You can do the same. Writing will help bring you to an understanding. Give it a try.

    What will man be like in the future—in 5000 or even 50,000 years from now? We can only make guesses, of course, but we can be sure that he will be different from what he is today, for man is slowly changing all the time.

    Let us take an obvious example, Man, even five hundred years ago, was shorter than he is today. Now, on averse, men are about three inches taller. Five hundred years is a relatively short period of time, so we may assume that man will continue to grow taller. Again, in the modem world we use our brains a great deal. Even so, we still make use of only about 20% of the brain's capacity. As time goes on, however, we shall have to use our brains more and more, and eventually we shall need larger ones! This is likely to bring about a physical change too: the head, in particular the forehead, will grow larger. Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over a very long period of time it is likely that man's eyes will grow stronger.

    On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they an; a great deal in modem life.

    But what about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald (光秃的).

    Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. But in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and emotions similar to our own.

    Most of us have friends as close as family, who, when necessary, we'd call at 3 a.m. for comfort or congratulations because we know they won't get angry about us. They're almost part of us, and we share with them with our troubles and successes. But although I love these Pour Your Heart Out friends, I also need the energy of my Let's Party friends. These friends care on a different level—less stressful, less deep—but they still care.

    And such friendships are important. 'With some friends, you want to be playful rather than deeply opening your heart,' says psychotherapist (心理治疗师) Susie Orbach. 'They feel relaxed and easy that you won't keep talking about your problems or stories, and you also feel the same way. It's healthy to have lots of different friends at different levels of closeness because not only is it impossible to be close to everyone, it's also unnecessary. You need to look at yourself from different angles (角度). This is the only way you can experiment with different parts of yourself.'

    Of course, it's upsetting to be with friends who can't-or-won't -allow you to open up your heart when you really need to find someone to listen to. But if we accept our Let's Party friends for what they want to offer us—fun, laughter, full stop—then we enrich our lives greatly.

    In cooperation with German experts, several scientists from the University of Bradford believe that they finally solved a mystery that has been confusing millions of people: why our hair turns gray with age.

    The researchers came up with their results by examining native hair and cells from human hair follicles（毛囊）. They say the secret turns out to be hidden in catalase（过氧化氢酶）, which is causing hair to turn gray.

    Catalase production goes down with age and stress, allowing hydrogen peroxide（过氧化氢） in the hair to do its favorite job—making hair gray, and then white, by blocking the normal production of melanin（黑色素）. Melanin is our hair's natural pigment that is responsible for the color of hair. It also determines the color of our eyes and skin.

    Dr. Gerald Weizmann, an editor of a journal, says," All of our hair cells make a tiny bit of hydrogen peroxide, but as we get older, this little bit becomes quite a lot, and our hair turns gray and then white."

    The new study brings hope for millions of people who have to color their hair: to finally obtain some shampoo that will decrease levels of hydrogen peroxide and therefore restore gray or white hair to its natural color or even prevent it from turning gray.

    The researchers are already conducting an experiment with such a drug on a few volunteers with gray hair and expect to get the results in the next two to three months. If everything works out, millions of people will choose between this drug and other previously used expensive dyes. However, even if the drug works, it will take at least several years before it can be brought to the market.

    China will soon issue licenses for the commercialization(商业化) of 5G, as the country has already established(建立)a competitive advantage in the superfast wireless technology.

    The Ministry of Industry and Information Technology said 5G is entering a critical period of commercial deployment(部署)globally and China's 5G industry has established a competitive advantage through a combination of innovation(创新) and open cooperation.

    Many foreign companies, including Nokia and Intel, have participated in China's technical 5G tests. These foreign companies have already participated in three phases of tests organized by China to get their 5G products and solutions ready for commercial use in the country.

    "With joint efforts of all parties, China has built a foundation for commercialization of 5G," the ministry said, adding it will issue commercial 5G licenses in the near future, a clear sign China will soon officially enter the first year of 5G.

    China's big three telecom carriers are forecast to spend 900 billion to 1.5 trillion yuan ($134 billion to $223 billion) in total on 5G network construction from 2020 to 2025, according to a report from the China Academy of Information and Communications Technology. In comparison, Chinese telecom operators spent 720 billion yuan on 4G network construction from 2014 to 2018.

    In 2019, China Mobile plans to build 30,000 to 50,000 5G base stations this year, while China Telecom is looking to have 20,000.

What's In a Name?（课文P40-41）

The United Kingdom, Great Britain, Britain, England--many people are {#blank#}1{#/blank#} (confuse) by what these different names mean. So what is the {#blank#}2{#/blank#} (different) between them, if any? {#blank#}3{#/blank#} (get) to know a little bit about British history will help you solve this puzzle.

In the 16th century, the nearby country of Wales was joined {#blank#}4{#/blank#} the Kingdom of England. Later, in the 18th century, the country Scotland was joined {#blank#}5{#/blank#}(create) the Kingdom of Great Britain. In the 19th century, the Kingdom of Ireland was added to create the United Kingdom of Great Britain and Ireland. {#blank#}6{#/blank#}(final), in the 20th century , the southern part of Ireland {#blank#}7{#/blank#} (break) away from the UK, which resulted {#blank#}8{#/blank#} the full name we have today: the United Kingdom of Great Britain and Northern Ireland. Most people just use the shortened name: "the United Kingdom" or "the UK". People from the UK are called "British", {#blank#}9{#/blank#} means the UK is also often {#blank#}10{#/blank#} (refer) to as Britain or Great Britain.

The four countries {#blank#}11{#/blank#} belong to the United Kingdom work together in some areas. They use {#blank#}12{#/blank#} same flag, known {#blank#}13{#/blank#} the Union Jack, as well as share the same currency and military {#blank#}14{#/blank#} (defend). However, they also have some differences. {#blank#}15{#/blank#} example, England, Wales, Scotland, and Northern Ireland all have different {#blank#}16{#/blank#} (educate) systems and legal systems. They also have their own {#blank#}17{#/blank#} (tradition), like their own national days and national dishes. And they even have their own football teams {#blank#}18{#/blank#} competitions like the World Cup!

The United Kingdom has {#blank#}19{#/blank#} long and interesting history to explore, {#blank#}20{#/blank#} can help you understand much more about the country and its traditions. Almost everywhere you go in the UK, you will be {#blank#}21{#/blank#} (surround) by evidence of four different groups of people {#blank#}22{#/blank#} took over at different times throughout history. The first group, the Romans, {#blank#}23{#/blank#} (come) in the first century. Some of their great achievements included {#blank#}24{#/blank#} (build) towns and roads. Next, the Anglo-Saxons arrived in the fifth century. They introduced the{#blank#}25{#/blank#} (begin) of the English language, and changed the way {#blank#}26{#/blank#} people built houses. The Vikings came in the eighth century, left behind lots of new vocabulary, and also the names of many {#blank#}27{#/blank#} (location) across the UK. The last group were the Normans. They {#blank#}28{#/blank#} (conquer) England after the well-known Battle of Hastings in the 11th century. They had castles {#blank#}29{#/blank#} (build) all around England, and made changes {#blank#}30{#/blank#} the legal system. The Normans were French, {#blank#}31{#/blank#} many French words slowly entered into the English language.

There is so much more {#blank#}32{#/blank#} (learn) about the interesting history and culture of the United Kingdom. Studying {#blank#}33{#/blank#} history of the country will make your visit much more {#blank#}34{#/blank#} (enjoy). The capital city London is a great place to start, as it is {#blank#}35{#/blank#} ancient port city that has a history {#blank#}36{#/blank#} (date) all the way back to Roman times. There are countless historic sites to explore, and lots of museums {#blank#}37{#/blank#} ancient relics from all over the UK. The UK is a {#blank#}38{#/blank#} (fascinate) mix of history and modern culture, with both new {#blank#}39{#/blank#} old traditions. If you keep your eyes open, you will be surprised {#blank#}40{#/blank#} (find) that you can see both its past and its present.