A machine that takes sweat-laden (浸满汗水的) clothes and turns the sweat into drinking water is in use in Sweden. The machine makes the clothes turn round quickly, heats them to remove the sweat, and then passes the steam through a kind of special material to make purified water.

    Since it has been brought into use, its creators say more than 1000 people have drunk others' “sweat” in Gothenburg. They add the liquid is cleaner than local tap water.

    The device was built for the United Nations' child-focused charity UNICEF to promote a campaign highlighting the fact that 780 million people in the world lack access to clean water.

    The machine was designed and built by the engineer Andreas Hammar, known locally for his appearances on TV tech show “Mekatronik”. He said the key part of the sweat machine was a new water purification part developed by a company named HVR.

    “It uses a technique called membrane distillation (膜蒸馏),” he told the BBC. “We use a special kind of material that only lets steam through but keeps bacteria, salts, clothing fibers and other things out. They have something similar to the International Space Station, but our machine is cheaper to build. The amount of water it produces depends on how sweaty the person is, but one person's T-shirt typically produces 10ml, about a mouthful.”

    The device has been put on show at the Gothia Cup-the world's largest international youth football tournament. Mattias Ronge, chief executive of Stockholm-based advertising agency Deportivo, said the machine had helped raise awareness for UNICEF, but in reality had its limitations.

    “People haven't produced as much sweat as we hoped – right now the weather in Gothenburg is lousy,” Mattias Ronge said. “So we've equipped the machine with exercise bikes and volunteers are cycling like crazy. Even so, the demand for sweat is greater than the supply. And the machine will never be produced in large numbers, since there are better solutions out there such as water purifying pills.”

    In America, parents tend to encourage their children to develop their potential(潜能)to the fullest extent. Fathers and mothers frequently teach their children both ambition and the confidence necessary to work toward their goals. American parents are always active in concentrating on what their kids can do, not what they can't. As a result, millions of American boys and girls grow up hoping to become actors and athletes, diplomats and doctors. Many of them even want to become president.

    American parents often encourage their children to become involved in extra activities of all types at school, such as student government, sports and music. They believe that only through taking part in these activities can their children become mature young adults.

    As we all know, schoolwork is important. But parents should realize that the social skills their children learn form natural conversations with each other are as important as schoolwork and the skills they will need in the future work. What's more important in their work is that their children should have a sound knowledge of physics or the ability to communicate effectively.

    As a rule, Chinese parents don't educate their children about the same kind of ambition and confidence as Americans do, nor do they encourage the same level of participation in extra activities. Children are typically advised to study hard and pass exams. They have to spend a lot of time in doing much schoolwork every day. It is a great waste of time to do so.

    Now more and more Chinese parents have recognized that they should pay attention to developing the potential of their children. I hope that leaders in Chinese educational circles should take some measures to develop the potential of their children. I am very confident about it.

    One half of the brain remains on high alert during the first night of sleep in a new space.

    Over the course of three experiments on 35 young, healthy volunteers, researchers measured brain activity during two nights of sleep. They found that part of the left side of the brain remained more active than the right side only on the first night, specifically during a deep sleep stage.

    “When you sleep in a new place for the first time, a part of one side of the brain seems to stay awake, so you could wake up faster if necessary,” said senior study author Yuka Sasaki of Brown University.

    While this may be bad news for business travelers who regularly make brief overnight trips, it may not be as troublesome for people who go away for longer periods of time, Sasaki added by email.

    To see how being in a strange place affects sleep, Sasaki and colleagues performed a series of lab tests on their subjects.

    When they stimulated（刺激） the left side of the brain with sounds in the right ear during deep sleep on the first night, that led to greater possibility of waking and faster action upon waking, than if sounds were played in the left ear to affect the right side of the brain. On the second night, there wasn't any difference in reactions to tests between the left and right sides of the brain, even during deep sleep. This suggests that there is a first-night-only effect specifically in one side of the brain during deep sleep, the authors conclude.

    One limitation of the new study is its focus on healthy volunteers, which means the results may not apply to people with sleep disorders, the authors note.

    While it's possible that the findings may explain poor sleep among frequent travelers, the study wasn't designed to test whether these “first night effects” continue to happen to people every time they hit the road, said Patrick Finan, a researcher at Johns Hopkins University School of Medicine in Baltimore.

    The Harvard Pre-College Program is a nice experience for high school students. Alongside peers(同辈)from around the world, you'll be introduced to college life as you attend classes, live on campus, and enjoy fun outings and activities.

    Learning without limits

    Biology, physics, law, writing and philosophy — these are just a few of the 30-plus courses you can choose from in each session. In our noncredit classes, we set aside grades so that you can fully commit to your growth as a well-rounded student. Class sizes typically range from 14 to 18 students to encourage interactive learning.

    Living at Harvard

    When you attend the Pre-College Program, you'll live in a historic undergraduate house, near Harvard Square. You will be with your fellow Pre-College students, resident directors, and proctors who provide support. You'll also enjoy meals in one of Harvard's dining halls, which are a short walk from Harvard Yard and provide many options for a variety of dietary needs.

    Thriving outside the classroom

    The summer Pre-College Program offers many mentally challenging co-curricular(补充课程的)activities beyond the classroom. With faculty and Harvard-affiliated experts, you will have the opportunity to participate in workshops on topics like the psychology of color-blindness, classic literature from around the world and science of happiness. From our Cambridge scavenger hunt to a trip to the Sand Sculpting Festival at America's first public beach, there's no shortage of fun activities in the Pre-College Program.

    "What kind of rubbish are you?" This question might normally cause anger, but in Shanghai it was brought about weary complaints over the past few months. On July 1st, the city introduced strict rubbish-sorting regulations that are expected to be used as a model for our country. Citizens must divide their waste into four separate categories and put it into specific public bins. They must do so at scheduled times, when monitors are present to ensure that rules are obeyed and to examine the nature of one's rubbish.

    Violators could be hit with fines of up to 200 yuan ($29). For repeat violators, the city can add black marks to their credit records, making it harder for them to obtain hank loans or even buy train tickets.

    Shanghai authorities are responding to obvious environmental problem. It produces 9 million tons of garbage a year. But like other cities in china, it lacks a recycling system. Instead, it has relied on rubbish pickers to pick out whatever can be reused. This has limits. As people get wealthier, fewer of them want to do such dirty work. The waste, meanwhile, just keeps piling up. China produces 80 billion pairs of one-off chopsticks a year.

    Many citizens appear to support the idea of recycling in general but are frustrated by the details. Rubbish must be divided according to whether it is food, recyclable, dry or hazardous(有害的), the distinctions among which can be confusing, though there are apps to help work it out. Some have complained about the rules surrounding food waste. They must put it straight in the required public bin, forcing them to tear open plastic bags and toss(投掷）it by hand, Most annoying are the short periods for throwing trash, typically a couple of hours, morning and evening. Along with the monitors at the bins, this means that people go at around the same time and can keep an eye on what is being thrown out; no one wants to look bad.

Not long ago, my daughter's shoes {#blank#}1{#/blank#}(damage) with a knife. She burst into tears. I took them to the shoemaker's. The man said he would add more scratches on both shoes as if the openings were made on purpose for a special style. I didn't fully understand him, but I decided to leave the shoes. Two days later I dropped by from work {#blank#}2{#/blank#}(collect) the shoes. I found more scratches on each shoe, but all the openings were patched by red leather and the stitches were twisted. The appearance looked {#blank#}3{#/blank#}( interesting) than ever.

The African penguin is expected to go extinct in the wild in just over a decade, given its current population decline. The main reason is a lack of food caused by disturbance to ocean conditions from global heating and {#blank#}4{#/blank#}(compete) from the commercial fishing industry. According to a study, recently scientists {#blank#}5{#/blank#}(identify) a possible additional cause, one that is an entirely new threat and that further {#blank#}6{#/blank#}(prevent) the penguins from finding food: noise pollution from marine ships in a bay.

Crying is a natural response to emotions. Regardless of{#blank#}7{#/blank#} causes the tears to flow, the physical reaction is usually the same with puffy cheeks and tight eyes {#blank#}8{#/blank#}(lead) to streaming tears down one's face. Despite its stigma(污名), crying can be an act {#blank#}9{#/blank#} relieves tension and clears feelings of negativity and sadness. Crying can communicate our emotions to others and foster greater understanding and compassion. Ultimately, crying is a powerful tool we ought to use to free ourselves {#blank#}10{#/blank#} negativity.