Your next car might drive itself. After years of trials on city streets, driverless vehicles are now nearing the live phase. Last moth, a driverless bus began carrying passengers through Lyon, France, Most in the automobile industry think self-driving vehicles will be on the road by 2020 or before.

    Driverless cars will at first be huddled with human-driven cars. But the first places where they will become dominant（统治的）are dense urban areas — precisely the spots most damaged by the automobile age. Many advanced cities are already reducing the role of human-driven cargo. Driverless cars will quicken that process and will bring us enormous benefits.

    Driverless cars will reduce accidents by around 90 percent. That's big—the annual death toll on the world's roads is about 1.2 million a year. Pollution and carbon emissions will drop, because urban driverless cars will be electric. The old, otherwise they would stay at home most of the time and the disabled and teenagers will suddenly gain mobility.

    On the other hand, driverless cars will bring catastrophe. The best thing about the automobile age was that it employed tens of millions of people to make, market, insure and drive vehicles. Over the next 20 years, the mostly low-skilled men who now drive trucks, taxis and buses will see their jobs reduced. Carmakers are especially scared. The few cars of the future might be made by tech companies such as Apple, Baidu and Google. Imaging the impact on Germany, where the automotive sector is the largest industry.

    Dramatic change is coming, and driverless cars could arrive by 2020. But governments have barely begun thinking about it. Only 6 percent of the biggest US cities have factored them into their long-term planning.

    A decade ago anyone hardly saw the Smartphone coming. It has bought an epidemic of mass addiction. Let's hope we do a better job of handling the driverless car.

    Can exercise during childhood protect you against memory loss many decades later? Exercise early in life seems to have lifelong benefits for the brain, in rats at least.

    “This is an animal study, but it shows that physical activity at a young age is very important—not just for physical development, but for the whole lifelong track of cognitive (认知的) development during ageing,” says Martin Wojtowicz of the University of Toronto, Canada. “In humans, it may delay the appearance of Alzheimer's symptoms (阿兹海默氏症), possibly to the point of preventing them.”

    Wojtowicz's team divided 80 young male rats into two equal groups, and placed running wheels in the cages of one group for a period of six weeks. Around four months later-when the rats had reached middle age-the team taught all the rats to connect an electric shock with being in a specific box. When placed in the box, they froze with fear.

    Two weeks later, the team tested the rats in three situations: exactly the same box in the same room, the same box with the room arranged differently, and a completely different box in a different room.

    The rats without access to a running wheel when they were young now froze the same percentage of times in each of these situations, suggesting they couldn't remember which one was dangerous. But those that had been able to run in their youth froze 40 to 50 percent less in both changed box settings.

    “The results suggest the amount of physical activity when we're young, at least for rats, has influence on brain and cognitive health-in the form of better memories-when we're older,” says Arthur Kramer of Northeastern University in Boston, who has found that, in humans, exercise promotes the growth of new brain cells.

    In fifth grade, my backpack was stolen from my dad's car, which had my binder (活页夹) with a few valuable stories that I have been working on for quite a while. I was very devastated. Then I decided to go to school with absolutely nothing.

    My 5th grade teacher, Miss Taylor, was really sweet, understanding and kind to me. She gave me an extra binder that she had, and to help personalize it, she got out a piece of paper, and started writing my name in a cool letter style. I was deeply moved by what she had done for me that day.

    But here's something even better. Later that same day, Miss Taylor had gotten a call from the office and told me exactly this “Zoe, A wonder has happened! Someone found your binder!” And I ran down to the office, and got my binder. It was really packed full, because the person that had found it had collected all written works and put them inside of my binder. When I opened it, an envelope fell out. On the back of the envelope was “I'm sorry all your things got stolen, but I hope this helps.” I opened the envelope and it had $20 in it.

    If something bad happens or if life lets you down sometimes, there are always lots of people out there that are kind, and can bring back faith and hope to humanity.

    Stephen Hawking was a famous physicist. He was born in 1942. He died at his home on March 14h, 2018 in Cambridge, Britain.
    As one of the well-known physicists on space and time in the world, Hawking devoted his whole life to discovering the secrets of the universe, and he is called the King of the Universe. Since he was 21 years old, Hawking had been badly ill, but he didn't give up his hope of living. He went on to study at Cambridge University after graduating from Oxford University. In 1965, he got a doctor's degree. Then he worked as a professor at Cambridge University.

    Hawking was known for his work with black holes. He also wrote several popular science books. Although he didn't live as freely as others, he still felt he was happy and he was thankful to life. When Hawking was invited to China, he made speeches in some famous universities.

    From Stephen Hawking's whole life, we learn that no matter how bad life is, we should not lose hope. As he once said," Life is not fair, you just have to do the best you can in your own situation."

When I was a boy, there was but one permanent ambition among my comrades in our village on the west bank of Mississippi River. That was, to be a steamboat man. We had temporary ambitions of other sorts, but they were only temporary.

My father was a justice of the peace, and I supposed he possessed the power of life and death over all men and could hang anybody that offended him. This was distinction enough for me as a general thing; but the desire to be a steamboat man kept intruding(闯入), nevertheless. One of our boys in town, who went away and was not heard of for a long time, turned up as an apprentice engineer on a steamboat. This thing shook the bottom out of all my Sunday-school teachings. That boy was notoriously worldly, and I was just the opposite. There was nothing generous about this fellow in his greatness. He would always manage to have a rust y nail to scrub while his boat stopped at our town, and he would sit on the inside guard and scrub it, where we could all see him. And wherever his boat was laid up he would come home and show off in the town in his blackest and greasiest clothes, so that nobody could help remembering that he was a steamboat man; and he used all sorts of steamboat technical terms in his talk, as if he were so used to them that he forgot common people could not understand them.

This creature's career could produce but one result, and it was speedily followed. Boy after boy managed to get on the river. Despite many choices, pilot was the grandest position of all. The pilot, even in those days of trivial wages, had a princely salary—from 150-250 dollars a month, and no board payment. But our parents would not let us and our worry was that the next year would find us hunting for jobs with low pay again. So by and by I ran away. I said I never would come home again till I was a pilot and could come in glory.