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    A buld-it-yourself solar still（蒸馏器） is one of the best ways to obtain drinking water in areas where the liquid is not readily available. Developed by two doctors in the U.S. Department of Agriculture, it's an excellent water collector. Unfortunately, you must carry the necessary equipment with you, since it's all but impossible to find natural substitutes. The only components required, though, are a 5'  5' sheet of clear or slightly milky plastic, six feet of plastic tube, and a container— perhaps just a drinking cup — to catch the water. These pieces can be folded into a neat little pack and fastened on your belt.

    To construct a working still, use a sharp stick or rock to dig a hole four feet across and three feet deep. Try to make the hole in a damp area to increase the water catcher's  productivity. Place your cup in the deepest part of the hole. Then lay the tube in place so that one end rests all the way in the cup and the rest of the line runs up — and out — the side of the hole.

    Next, cover the hole with the plastic sheet, securing the edges of the plastic with dirt and weighting the sheet's center down with a rock. The plastic should now form a cone(圆锥体) with 45-degree-angled sides. The low point of the sheet must be centered directly over, and no more than three inches above, the cup.

    The solar still works by creating a greenhouse under the plastic. Ground water evaporates (蒸发) and collects on the sheet until small drops of water form, run down the material and fall off into the cup. When the container is full, you can suck the refreshment out through the tube, and won't have to break down the still every time you need a drink.

    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.

    Reader: For six years, I've run an office that has two employees: me and my boss. He used to be so appreciative that I didn't mind doing a little extra, but about two months ago, he started being rude and demanding. Now he even yells when I don't have time to bring his favorite wine to his home after work.

    This change started when we met a wealthy new customer, who is a huge jerk (古怪的人) -- my boss's new behavior is just like his.

    My boss is a good man; he and his family have treated me like a little sister. Is there a good way to discuss this with him?

    Karla: Sounds like your new customer has set a bad example to your boss. You need to remind your boss that you're in his corner-- but you're not his slave. My suggestions are as follows.

    Start with a simple question in a calm moment: "Is everything okay?"

    State the truth: "Until recently, I've felt like a valued teammate. But our relationship has become tense. Your expectations of me seem to have changed. Although I used to do occasional personal businesses for you as a favor, now it seems expected."

    Draw your lines: "If you think my job description needs to change or my performance is not good enough, let's discuss that. Otherwise, I need you to stop yelling at me and to respect my personal time."

    Ideally, you'll get an apology and a promise to do better. After that, it's a matter of reinforcement (加强) . If he starts yelling, look at him with a calm expression. After he cools down, restate his request and add, "Is that correct?" For the unreasonablerequest, such as fetching his favorite wine after work: "I'm afraid I can't take care of that for you." If he keeps acting like a jerk, there are bosses out there who will better respect your time and talent.

    Karla L. Miller is ready to hear your work dramas. Send your questions to wpmagazine@washpost.com.

    Most high school students would rather spend their summer vacations far away from the classroom. But Vineet Kosaraju and Nikhil Cheerla are choosing to go back to school, and this time they are the teachers.

    "I think it's really nice that I can help the community by spending just a little bit of time every week helping just a few students here and there try and learn programming," Kosaraju said.

    Friends since they were young boys, Kosaraju and Cheerla always shared a love of computer science. They learned the skills from their parents and school, but recognized that not all children have that chance.

    "Programming isn't taught in that many schools, especially low income (收入) schools, because there isn't that much money to support it," Kosaraju said.

    So he and Cheerla developed "Math and Coding," an after-school program for kids of all ages to learn the basics of computer programming.

    Between applying for college and doing their own homework, the two boys now spend a few hours every week going to different libraries teaching classes that cover everything from building basic games to developing apps.

    The friends started the program a little over a year ago and already, it's spread to more than a dozen libraries across the Bay Area in California. They are even training volunteers to teach these very same classes in other US states and Canada.

    Maryann Mitchell brought her 8-year-old granddaughter, Gabriella, to a class on coding at the Alum Rock Library in San Jose, California.

    "It's a chance for her to learn," Mitchell said. "It's the way of the future, and it's a good way for her to get grounded and be ready for what the future holds."

    "I think the most rewarding thing is having people come up and thank you and say they really learned a lot from this class," Cheerla said. "It doesn't get any better than that."

    We all know what a brain is. A doctor will tell you that the brain is the organ of the body in the head. It controls our body's functions, movements, emotions and thoughts. But a brain can mean so much more.

    A brain can also simply be a smart person. If a person is called brainy, he is smart and intelligent. If a family has many children but one of them is super smart, you could say, “He's the brains in the family.” And if you are the brains behind something, you are responsible for developing or organizing something. For example, Bill Gates is the brains behind Microsoft.

    Brain trust is a group of experts who give advice. Word experts say the phrase “brain trust” became popular when Franklin D. Roosevelt first ran for president in 1932. Several professors gave him advice on social and political issues(问题)facing the U.S. These professors were called his “brain trust”.

    These ways we use the word “brain” all make sense. But other ways we use the word are not so easy to understand. For example, to understand the next brain expression, you first need to know the word “drain”. As a verb, to drain means to remove something by letting it flew away. So a brain drain may sound like a disease where the brain flows out the ears. But, brain drain is when a country's most educated people leave their countries to live in another. The brains are, sort of, draining out of the country.

    However, if people are responsible for a great idea, you could say they brainstormed it. Here, brainstorm is not an act of weather. It is a process of thinking creatively about a complex topic. For example, business leaders may use brainstorming to create new products, and government leaders may brainstorm to solve problems.

    If people are brainwashed, it does not mean their brains are nice and clean. To brainwash means to make some accept new beliefs by using repeated pressure in a forceful or tricky way. Keep in mind that brainwash is never used in a positive way.

    The Danish lifestyle concept of hygge means many indescribable feeling of comfortable things to many people. Now, join us in visiting some of the best hygge places.

    ⒈Manhausen (Manshausen, Norway)

    Adventure-seeking people needn't look further than Manhausen, a 55-acre island escape in Norway's Groteya strait. Not to be missed the saltwater hot tub overlooking the sea and family-style meals enjoyed fireside at the main house. The baby sitting service also available.

    Get more information here.

    ⒉Cedar Lakes Estate (Port Jervis, New York)

    Occupying 500 bucolic acres, this turnof-the-century summer camp now houses a host of luxury, lodge-style cabins. Bike the grounds, paddle the lakes, swim in the outdoor heated pool or head to a nearby mountain for a day of skiing. Then lie down with a great book beneath a fur blanket, turn on your fireplace and get your snuggle on.

    Get more information here.

    ⒊Soho Farmhouse (Oxfordshire, England)

    This Oxfordshire countryside members-only club offers up a British version of hygge. Among the splendid property's coziest offerings: the community farmyard and the Studie Cabin guest room, which boasts views of the lake.

    ⒋Salt House Inn (Provincetown, Massachusetts)

    This charming coastal town now boasts a 19th-century-shingled cottage turned hotel. Book your visit during the quiet, windswept off-season (January through March) for some salty fresh air on the beach.

    Get more information here.