What would it be like to walk on Mars? If you could build the highest building in the world，what would it look like? Do you dream of being the next J. K. Rowling? This summer, you can experience all of these things, and more. All you need is an Internet connection and your imagination.

    A recent study by the Kaiser Family Foundation found that kids spend an average of 1 hour and 29 minutes online each day. Many kids like to use that time to chat with friends, play games or check e­mails. But the next time you get on the Web, try exploring the world instead. “With the Internet，you can go back 11,000 years in time，or go 11,000 kilometers across the planet.” said Russell, Web search expert of Google. “The whole scope of history and the world is open to you.”

    There is a wealth of information to be found online. For example, if your family is going on vacation somewhere, do a quick online search on the area before you even get in the car. “What's the background of the place; what's the history？” says Russell. “I like to tell my kids, ‘Whenever you have a question, whenever you have a doubt, search it out.'”

    Ready to launch a virtual journey of your own? Here are a few starting points to get you thinking and to help you on your way. You can invite your parents along for the ride, too. Always ask for permission before downloading programs and software onto your computer. And check with a parent or an adult before visiting any new Web site.

    Navigate the world in 3­D with Google Earth. Begin in outer space and zoom (快速移动) into the streets of any city, from Hong Kong to San Francisco. Or visit ancient monuments, watch the changing rainforests over time, and dive underwater to explore tropical reef.

    With the Moon in Google Earth tool, you can walk in Neil Armstrong's famous footsteps. Take a guided tour of the moon's surface with Armstrong's fellow shuttle mate astronaut Buzz Aldrin.

    When you're exploring that part of the solar system, hop on over to the Red Planet with Google Mars. There, you can move very quickly around the surface and see images from the Mars Rovers.

    Last night, on my way home I stopped because of being attracted by some hamburgers at a fast food restaurant. On my way in, a homeless man approached me and asked, “Do you have any bottles lying around?” I knew he would recycle them for a few cents, but I didn't have any, so I said no. And again he asked, “Can you spare some change (零钱)?” I smiled, and said no again. He was very respectful; he smiled back and said, “OK, thank you.” Even though he didn't have anything, he was still in good spirits. From the way he spoke I could tell he was smart.

    Then I bought one hamburger and enjoyed my meal, but in the back of my mind I wondered whether the homeless man was hungry. After I finished my meal I decided to order another one for him. At this point I didn't know if he was still around, but I tried anyway.

    At the counter I ordered a hamburger and also a hot chocolate, because it was cold outside, and I thought it would help warm him up. They delivered me the hot chocolate first and as I waited for my hamburger, I noticed the homeless man was standing right beside me. I looked at him and smiled, “This hot chocolate is for you.”He replied like a gentleman,“Thank you so much. That's very kind of you.”

    I always believe no matter how hard up (缺钱) I am, there are always those who are worse off than I. When you help someone, it's not always about money, it's about love. The love you give today, someone might forget tomorrow. It doesn't matter. Love anyway, because the greatest thing you can give is love.

    No one has a temper naturally so good, that it does not need attention and cultivation, and no one has a temper so bad, but that, by proper culture, it may become pleasant. One of the best disciplined tempers ever seen, was that of a gentleman who was naturally quick, irritable, rash, and violent; but, by taking care of the sick, and especially of mentally deranged(疯狂的) people, he so completely mastered himself that he was never known to be thrown off his guard.

    There is no misery so constant, so upsetting, and so intolerable to others, as that of having a character which is your master. There are corners at every turn in life, against which we may run, and at which we may break out in impatience, if we choose.

    Look at Roger Sherman, who rose from a humble occupation to a seat in the first Congress of the United States, and whose judgment was received with great respect by that body of distinguished men. He made himself master of his temper and cultivated it as a great business in life. There are one or two instances which show this part of his character in a light that is beautiful.

    One day, after having received his highest honors, he was sitting and reading in his sitting room. A student, in a room close by, held a looking­glass in such a position as to pour the reflected rays of the sun directly in Mr. Sherman's face. He moved his chair, and the thing was repeated. A third time the chair was moved, but the looking­glass still reflected the sun in his eyes. He laid aside his book, went to the window, and many witnesses of the rude behavior expected to see the ungentlemanly student severely punished. He raised the window gently, and then—shut the window blind!

    I can not help providing another instance of the power he had acquired over himself. He was naturally possessed of strong passions, but over these he at length obtained an extraordinary control. He became habitually calm and self­possessed. Mr Sherman was one of those men who are not ashamed to maintain the forms of religion in their families. One morning he called them all together as usual to lead them in prayer to God. The "old family Bible" was brought out and laid on the table.

    Mr Sherman took his seat and placed beside him one of his children, a child of his old age. The rest of the family were seated around the room, several of whom were now grown­ups. Besides these, some of the tutors of the college were boarders in the family and were present at the time. His aged mother occupied a corner of the room, opposite the place where the distinguished Judge sat.

    At length, he opened the Bible and began to read. The child who was seated beside him made some little disturbance, upon which Mr Sherman paused and told it to be still. Again he continued but again he had to pause to scold the little offender, whose playful character would scarcely permit it to be still. At this time he gently tapped its ear. The blow, if blow it might be called, caught the attention of his aged mother, who now with some effort rose from the seat and tottered across the room. At length, she reached the chair of Mr Sherman, and in a moment, most unexpectedly to him, she gave him a blow on the ear with all the force she could gather. "There," said she, "you strike your child, and I will strike mine."

    For a moment, the blood was seen mounting to the face of Mr Sherman. But it was only for a moment and all was calm and mild as usual. He paused; he raised his glasses; he cast his eye upon his mother; again it fell upon the book from which he had been reading. Not a word escaped him; but again he calmly pursued the service, and soon sought in prayer an ability to set an example before his household which should be worthy of their imitation. Such a victory was worth more than the proudest one ever achieved on the field of battle.

    A T-shirt that constantly monitors the heart's activity and detects abnormalities could help protect people against stroke. The T-shirt, which can be washed up to 35 times before it needs replacing, has been developed to improve the detection of dangerous heart conditions like atrial fibrillation( 心房颤动), which causes an irregular heart rhythm and raises the risk of stroke.

    At least one million people in Britain are known to have this condition; however, it's estimated that at least another 500,000 have it but haven't yet been diagnosed because they have no obvious symptoms. Some will have symptoms such as chest pain, dizziness and fatigue; but a large number of people have no idea they're ill until they suffer a stroke.

    Detecting atrial fibrillation involves carrying out an ECG(心电图). Conventional ECGs are done in a hospital and involve highly trained teams of staff attaching up to 24 separate electrodes(电极) to different parts of the body to measure electrical signals. But most patients experience abnormal rhythms only intermittently(间歇地). This means the chance of picking them up during a short hospital check is slim.

    Doctors sometimes issue patients with a device called a Holter monitor to wear under their clothes to try to pick up cardiac( 心脏的) problems. This is an electronic box which clips onto your waistband and is connected to a series of electrodes worn on the upper part of your body. But the box itself is quite bulky, hard to hide beneath clothing and involves a dozen or more wires being attached to the patient's chest.

    The Cardioskin T-shirt, which is made from cotton, could be a much more convenient alternative and can be worn 24 hours a day — meaning it is more likely to pick up any abnormal rhythms in the patient's heart. It has 15 tiny electrodes woven into the material which are strategically placed around the chest area to track the electrical signals from the heart as they travel across the main part of your body.

    The electrodes are powered by a battery which can be removed easily when you need to wash the T- shirt and feed results to a microchip which then sends them out wirelessly to an app. This converts( 转换) the data into an easy-to-read chart showing if the heart rate is abnormal. The results are shared with the patient's doctor so they can check the patient's heart without having to call them into the hospital.

    Martin Cowie, a professor of cardiology at Imperial College London, said, “Cardioskin could be an important development for cardiologists.”

The summer I turned 16, my father gave me his car — a gift wasted on me at that age. The important thing was that Hannah and I could drive around.

    Hannah was my best friend, a year younger but much taller, almost five foot ten. "Hannah's a knockout," my mother always said. And that summer she signed with a modeling agency. She was already doing runway work.

    A month after my birthday, Hannah and I went to the movies. On the way home, we stopped at the McDonald's drive-through, putting the fries on the seat between us to share. "Let's ride around a while," I said. It was a clear night, full moon slung low over the desert. Taking a turning too fast, I plowed (撞)through a neighbor's wall and drove into a full-grown tree.

    We were taken in separate ambulances. I'd cracked(使裂开)my cheek bone; Hannah's forehead had split wide open. End of her modeling career. What would I say to her?

    When her mother, Sharon, came into my hospital room, I started to cry. She sat beside me and took my hand. "I rear-ended(追尾) my best friend when I was your age, "she said, "I totaled her car and mine."

    "I'm so sorry." I said.

    "You're both alive," she said, "The rest is window dressing. I forgive you. Hannah will too."

Sharon's forgiveness allowed Hannah and me to stay friends throughout high school and college, to be at each other's weddings … The scars are so faded that no one else would notice, but in the sunlight I can still see it just below her hairline — for me, a mark of grace(优雅).

    In 2019, a big revolutionary technology shift will finally occur, which is called 5g. It is a once-in a-decade upgrade(升级)to our wireless systems that will start reaching mobile phone users in a matter of months. This new times will leap ahead of current wireless known as 4g by offering mobile internet speeds that will let people download an entire 120-minute movie within a second

    But this is not only about faster smart phones, but also will affect many other kinds of devices, including industrial robots, security cameras, drones(无人机), automatic cars, video games, sports, shopping and traffic data. With 5g technology, a clearer and truer 3D images will be formed and it can be off-loaded to other machines wirelessly, freeing users to move and making it easier to develop goggles(目镜)the size of eyeglasses. People can point a smart phone camera to a football game and see both live video on the display and player statistics or other data. Moreover 5g powerful effects extend to remote medical surgery and other fields that increasingly rely on high-speed connections.

    Officials in the United States and China regard 5g networks as a heated competitive edge. It can help spread the use of artificial intelligence and other cutting-edge technologies. Meanwhile, to get the benefits of 5g, users will have to buy new phones, while carriers will need to install new communication services, which will create a huge future market. In order to occupy it first, the famous world wireless service providers such as AT&T, Verizon, Samsung, Huawei have already declared that they will enter 5g business and showed their 5g new smart phones.

    However, in the United States, Verizon and AT&T will offer their 5g service with first use of high frequencies known as millimeter waves that can pump data at high speeds, but their signals don't travel as far. Instead Sprint and T-Mobile plan to start with lower frequencies, whose result may be somewhat slower initial speed, but wider range, although they all claim that they have mastered 5g technology. Thus they only first target the areas with large population. So 5g's full benefit to all are not expected until the main US key carriers upgrade their key switching equipment, which may happen in late 2019 or early 2020.