In summer, millions of people will head for the beach．And while the ocean can be a great place to swim and play, it may also be useful in another way. Some scientists think that waves could help make electricity．

    “Have you ever been on a surfboard or boat and felt yourself being lifted up by a wave? Or have you jumped in the water and felt the energy as waves crashed over you?” asked Jamie Taylor of the Wave Energy Group at the University of Edinburgh in Scotland．“There is certainly a lot of energy in waves．”

    Scientists are working on using that energy to make electricity．Most waves are created when winds blow across the ocean．“The winds start out by making little ripples (波纹) in the water, but if they keep on blowing , those ripples get bigger and bigger and turn into waves, ” Taylor said．“Waves are one of nature's ways of picking up energy and then sending it off on a journey．”

    When waves come towards the shore, people can set up dams or other barricades to block the water and send it through a large wheel called a turbine (涡轮) ．The turbine can then power an electrical generator (发电机) ．

    The United States and a few other countries have started doing research on wave energy , and it is already being used in Scotland．

    The resource is huge．We will never run out of wave power, besides, wave energy does not create the same pollution as other energy sources, such as oil and coal．

    Oceans cover three quarters of the earth's surface．That would make wave power seem perfect for creating energy around the world．There are some drawbacks, however．

    Jamie Taylor said that wave power still cost too much money．He said that its effects on animals in the sea were still unknown．Plus, wave power would get in the way of fishing and boat traffic．

    With more research, however, “many of these problems might be overcome,” Taylor said．“Demand for energy to power our TVs and computers, drive our cars, and heat and cool our homes is growing quickly throughout the world．Finding more energy sources is very important, for traditional sources of energy like oil and gas may run out some day．”

    In the future, when you turn on a light switch, an ocean wave could be providing the electricity!

    Although most games have winners and losers, the goal of sports is not to win every game. The real goals include getting exercise, having fun, and learning important social skills, like good sportsmanship.

    Good sportsmanship is all about respect. Good sports (具有运动家品格的人) respect their teammates and also their opponents. They respect their coaches, and they also respect the referees or other officials involved in their games. {#blank#}1{#/blank#} They yell at their teammates and they talk back to coaches or referees.

    Kids usually learn sportsmanship — good and bad — from the adults in their lives. {#blank#}2{#/blank#} If parents and coaches show disrespect to other fans, referees, or each other, kids will likely act the same way on the field.

    {#blank#}3{#/blank#} Some of them are very basic and easy to do, like shaking hands with other players before a game. Other examples may take a little more courage, such as acknowledging a great play made by the opposing team.

    Learning good sportsmanship is important because it helps you develop an attitude of graciousness (礼貌) and respect that will carry over into all the other areas of your life. {#blank#}4{#/blank#} Being a good sport in the classroom will eventually lead to being a good sport in the workplace.

    So be a good sport in whatever you do！ {#blank#}5{#/blank#} When others see you acting in a way that makes it clear that winning isn't the most important thing, you can move on to focusing on the important things, like having fun, getting exercise, and improving your skills!

A．Good sportsmanship can be shown in many ways.

B．On the contrary, bad sportsmanship is all about disrespect.

C．The example you set can be a powerful teaching tool for others.

D．Players' parents and coaches set examples that kids tend to follow.

E．We can be good sports by encouraging others but not laughing at them.

F．Starting as a good sport earlier will help you be a good sport as you get old.

G．If you're a good sport on the field, you'll also likely be a good sport in the classroom.

    The world seems gloomy(阴沉的)and gray when you're feeling blue. In fact, being down might even affect how you perceive(感知)the color blue. A recent study about color was published in the journal Psychological Science. It shows a direct connection between a person's ability to perceive color and their emotions.

    Psychologists have long known that emotions can affect the way people perceive things. That's in part because chemicals from your brain might affect how you process what you see. “Color is such an important part of our experience,” says lead author Christopher Thorstenson, a psychologist at the university of Rochester, in New York. There's reason, he says, that sad people commonly describe the world as “colorless” and “gray”, and happy people use words like “bright” and “colorful”.

    In the experiment, the researchers randomly assigned people to one of two groups. People in the “sadness” group watched a sad scene from The Lion King. Those in the “amusement' group watched a comedy.

    Everyone was then asked to look at red, yellow, green, and blue patches(斑点)that had been changed to a grayish color. “Some of the patches are pretty difficulty to make out,” Thorstenson admits he says it takes some time to figure out their shade. People were scored on how accurate their color perception was. Then they completed an emotional evaluation.

    The result? Sad people had a hard time seeing the difference between shades along the blue-yellow color axis(色轴). But they did no have problems seeing colors in the red-green spectrum(光谱). Thorstenson says this could be the result of an evolutionary need to see red as a response to anger.

    Thorstenson says these results highlight the possible important of dopamine in sight. Dopamine is a chemical that sends signals to the brain. Researchers are hoping to focus more on dopamine in the future. “We know dopamine affects how we see colors, too,” Thorstenson says “How we feel can really influence how we see the world around us” he says.

    Around this time a few years ago, it was common to see videos of friends on social media having a bucket of icy water thrown on them. Known as the “ice bucket challenge”, it was created as a way to raise money for the medical condition ALS. But now, there's a new challenge and this time, no water is involved.

    What is it? Well, think of a fruit that you'd never normally sink your teeth into. Perhaps you've got it: a lemon. While we enjoy using lemons to add flavor to dishes, very few of us would actually eat one as we'd eat an apple or an orange.

    But the horrible taste is the precise reason why the “lemon face challenge” is taking off. Participants bite into a lemon, taking a selfie as they do it before posting the photo online. The fun is all about expression people make as all that citric acid (柠檬酸) hits their taste buds (味蕾). Every expression seems to say, “This is worse than freezing water.”

    The serious side to this trend is the good cause it's all in aid of. The challenge aims to raise awareness of a rare brain cancer that affects young children. It was started by Aubregh Nicholas, an 11-year-old US kid. She was diagnosed with this rare brain cancer herself in September 2017, but has since raised almost $50000 to cover her medical expenses thanks to the challenge.

    If a challenge is going to raise publicity and contributions from people, it has to be something interesting and original. That way the ice bucket challenge took off in 2014 and it explains why so many people are now sharing their lemon faces. There are a lot of stories about the downside of social media these days. The charity challenges, however, show how online culture can unite the world and bring help to the people who most need it.

    Google's new camera, called Clips, is a small, smart device. It comes with a case that has a clip (夹子)，but it's not designed to be worn on your clothing. Most interestingly, it uses artificial intelligence to take photography out of your hands so it can capture moments on its own.

    This roughly 2-inch by 2-inch camera, with a three-hour battery life and Gorilla Glass for toughness, is intended for candid moments, like when a child does something cute that may happen too quickly for you to pull out your smartphone.

On board the Clips device, it uses machine learning algorithms (计算程序) to help capture scenes. Those algorithms include face recognition. “Once it learns that there's a face you see frequently, it'll try to get nice photos of those faces,” said Juston Payne, the device's product manager. And they also want it to recognize facial expressions, which involved “training it to know what happiness looks like”. The Google team also trained it to recognize what not to shoot — like when a child's hand is over the lens, or if it is tossed in a dark purse.

    The only way to see the images is by connecting the camera with your phone, as it has no screen for viewing or editing.

    Were people concerned it could seem strange? Yes, Payne admitted. But they said they addressed that by making it obvious what it is. A green light on the front signals that it is on. Besides, unlike a camera meant to monitor your home, it is not connected to the Internet.

    “This product is only possible because of the way that silicon has advanced” Payne said, noting that it was only in the past year or so that they could squeeze the technology down into a device this size. Going forward, we're likely to get more assistance from the artificial intelligence packed into our apps and gadgets.

    Music is not just a set of sounds and rhythms. Its influence on the brain is much deeper than any other human experience. Keep on reading to know all those amazing powers of music.

    A recent study suggests that preterm (早产的) babies appear to experience less pain and feed more when listening to music. Experts led by Dr. Manoj Kumar of the University of Alberta, Canada, found that music had a beneficial effect on reducing pain for preterm babies experiencing painful medical tests. It also appeared to benefit full-term babies during operations.

    Many people experiencing brain damage have speech and movement-related problems. Music can help recover from brain injuries. As a different and effective treatment, doctors often advise such patients to listen to good music to improve the parts of the brain responsible for these two functions. When people with neurological (神经的) disorders hear a musical beat, it helps them to regain a balanced walk.

    Though music cannot make deafness disappear, it really can stave off the loss of hearing. There was an experiment involving 163 people where 74 were musicians. Participants were asked to pass some listening tests. Musicians heard the sounds better than non-musicians, and this difference gets clearer with age. This means that a 70-year-old musician hears better than a 50-year-old non-musician, even in a noisy environment.

    Besides, music mends a broken heart. It is not about a thrown-away love, but about a heart attack. The matter is that music can help people recover from a heart attack or heart operation by reducing blood pressure, slowing down the heartbeat rate, and reducing anxiety. Listening to the quality music produces positive emotions, improves the movement of blood, and expands blood vessels, thus, promoting quick recovery of the whole cardiovascular (心血管的) system.