You get anxious if there's no wi-fi in the hotel or mobile phone signal up the mountain. You feel upset if your phone is getting low on power and you secretly worry things will go wrong at work if you're not there. All these can be called “always on” stress caused by smart phone addiction.

    For some people, smart phones have set them free from the nine-to-five work. Flexible working has given them more control over their working lives and enabled them to spend more time with their friends and families. For many others though, smart phones have become cruel masters in their pockets, never allowing them to turn them off and relax.

    Pittsburgh-based developer Kevin Holesh was worried about how much he was ignoring his family and friends in favor of his iPhone. So he developed an app — Moment — to monitor his usage. The app enables users to see how much time they're spending on the device and set up warnings if the usage limits are broken. “Moment's goal is to promote balance in your life,” his website explains. “Some time on your phone, some time off it enjoying your loving family and friends around you.”

    Dr. Christine Grant, an occupational psychologist at Coventry University, said, “The effects of this ‘always on' culture are that your mind is never resting, and you're not giving your body time to recover, so you're always stressed. And the more tired and stressed we get, the more mistakes we make. Physical and mental health can suffer.”

    And as the number of connected smart phones is increasing, so is the amount of data. This is leading to a sort of decision paralysis (瘫痪) and is creating more stress in the workplace because people have to receive a broader range of data and communications which are often difficult to manage. “It actually makes it more difficult to make decisions and many do less because they're controlled by it all and feel they can never escape the office,” said Dr. Christine Grant.

    I stand outside waving at the car pulling slowly out of our driveway. I force a smile, hoping it will cover up my tearing eyes, but I know it's not working. I run into the house, slam the door behind me, and begin crying. It's just occurred to me that I can't see my elder sister, Monsura, in the next four months.

    I ask myself why it is that I'm crying when I know she's doing something good for herself. I feel selfish for thinking about it but I'd be lying if I said I was happy for her choosing to study in a university in Boston. When my brother, Shafat, left for college, it was different. I still had one sibling at home to call me the stupidest person on a daily basis.

    I am reminded of the things we did together as kids. In our old two-bed-room apartment, our parents gave in to our constant begging and traded rooms with us for one night. It was like being part of the amusement park, using our parents' big bed as a trampoline (蹦床).It was during the first night that I witnessed a full moon. My sister and I believed my brother. He said that the moon was yellow because it was made from cheese. We made plans to visit the moon so we could melt a part of it and make cheese dip. But now I laugh at myself for being so innocent.

    Sitting in front of my computer, I listen to songs that remind me of my two best friends. I come to terms with the fact that there's no longer anyone here to laugh uncontrollably with me or to turn to at night when I have a nightmare.

    I'm shaken into reality by the sound of my cell phone ringing. Shafat is calling. I pick up and he immediately says “Thank you for such a great childhood.'' Those few words mean the world to me. We three-way call Monsura and spend the next hour reliving memory after memory, and by the end, I forget that I'm alone at home.

    Since 2008, hunters have illegally killed more than 3000 rhinos in South Africa. The International Union for Conservation of Nature warns that rhinos may die out by 2026. People who hunt and kill illegally are called poachers. The most effective way to watch for and prevent illegal hunting is from the air. However, piloted flights are too costly. Fortunately, some Spanish college students have invented a drone (无人机) that can observe more places than a plane.

    Arnau Garcia is an aeronautical (航空学的) engineering student at the Polytechnic Institute of Catalonia, in Spain. He says observers from the air have trouble finding poachers when they hide under the trees. Mr. Garcia and other students have worked with the drone manufacturer HEMAV to help find the hidden poachers. They make it by using the thermal camera, which is especially sensitive to body heat. Even when the poachers keep still, it can also keep track of them.

    The drone can fly in the wind up to 55 kilometers per hour. It has an autopilot system, so it memorizes the flight path. The drone also has a microphone, a video camera and a GPS system. These permit it to report accurately where a picture is taken. After each flight, the drone can bring back detailed information about where rhinos are found, the conditions of water and plants in the area, and the positions of suspected poachers.

    Experts say the drone can fly as far as 70 kilometers from the base. It means that it could quickly observe large areas for poachers. However, the same search operation would take days for human observers. Thanks to the drone, many poachers have been caught and the number of rhinos is on the increase. In addition, HEMAV has received an increasing number of orders for the drone. Even South African national park officials attempt to fill the air with drones.

    Today is a perfect day that can leave you with good memories you may someday share with your friends. Here's how:

    {#blank#}1{#/blank#} You can see or do something a million times, but you can only see or do it for the first time once. As a result, first time experiences usually leave a deep mark in our minds for the rest of our lives. So try to experience something different and you'll have more memories!

    Work on something that's great to you. {#blank#}2{#/blank#} Life is short. Today is the day to take action.

    Smile and notice what's right. Everything that happens in life is neither good nor bad.

    {#blank#}3{#/blank#} And no matter how it turns out, it always ends up just the way it should. Either you succeed or you learn something.

    Be true to yourself. The only shoes you can wear are your own. If you aren't being yourself, you aren't truly living. {#blank#}4{#/blank#}

    Make a new friend. People are interesting creatures (生物), and no two people are exactly alike. {#blank#}5{#/blank#} Find out what makes them different. They'll likely open your eyes to wonderful ideas. And you never know, they just might change your life.

    Be present.  Be here now. Remember, right now is the only dear moment to you.  Right now is life.  Don't miss it.

A. Learn a new skill.

B. Try something new.

C. It just depends on your opinion.

D. So meet someone new today.

E. And in fact, you're only existing.

F. Pay close attention to what you're doing.

G. Make yourself busy with something meaningful.

    When John was growing up, other kids felt sorry for him. His parents always had him weeding the garden, carrying out the garbage and delivering newspapers. But when John reached adulthood, he was better off than his childhood playmates. He had more job satisfaction, a better marriage and was healthier. Most of all, he was happier. Far happier.

    These are the findings of a 40-year study that followed the lives of 456 teenage boys from Boston. The study showed that those who had worked as boys enjoyed happier and more productive lives than those who had not. "Boys who worked in the home or community gained competence（能力）and came to feel they were worthwhile members of society, " said George Vaillant, the psychologist（心理学家）who made the discovery. "And because they felt good about themselves, others felt good about them."

    Vaillant's study followed these males in great detail. Interviews were repeated at ages 25, 31and 47. Under Vaillant, the researchers compared the men's mental-health scores with their boyhood-activity scores. Points were awarded for part-time jobs, housework, effort in school, and ability to deal with problems.

    The link between what the men had done as boys and how they turned out as adults was surprisingly sharp. Those who had done the most boyhood activities were twice as likely to have warm relations with a wide variety of people, five times as likely to be well paid and 16 times less likely to have been unemployed. The researchers also found that IQ and family social and economic class made no real difference in how the boys turned out.

    Working—at any age—is important. Childhood activities help a child develop responsibility, independence, confidence and competence—the underpinnings（基础）of emotional health. They also help him understand that people must cooperate and work toward common goals. The most competent adults are those who know how to do this. Yet work isn't everything. As Tolstoy once said, "One can live magnificently in this world if one knows how to work and how to love, to work for the person one loves and to love one's work."

    Finding fruits and vegetables at your typical grocery store that have been grown without the extensive use of pesticides can be difficult. Fortunately, The Environmental Working Group(EWG) has done all of the work for you in finding healthy and pesticide－free produce.

    EWG has created the 2018 Shopper's Guide to Pesticides in Produce, which helps shoppers to find uncontaminated produce. Many consumers do not realize that pesticide residues(残留) are very common on conventionally grown produce products, even after they have been washed or peeled. Because of this, EWG has created their series of guides to lead consumers to safer food choices.

    In order to create these guides, EWG analyzed the USDA pesticides tests, which found a total of 230 different pesticides and pesticides breakdown products on thousands of produce samples. Analyzing this information, EWG observed the big differences of the amount of pesticides found from product to product.

    The guide's two main components are two compiled lists highlighting the cleanest and dirtiest produce concerning pesticides. These two lists, Dirty Dozen and Clean Fifteen, show consumers how certain foods continue to carry trace amounts of pesticides with them all the way to the grocery store shelves, while others make it to your kitchen virtually pesticide－free.

    Some of the highlights from their analyses included the following findings：

    More than one－third of strawberry samples analyzed in 2016 contained 10 or more pesticide residues and breakdown products.

    Spinach(菠菜) samples had, on average, almost twice as much pesticide residue by weight compared to any other crop.

    No single fruit sample from the Clean Fifteen tested positive for more than four pesticides.

    “With EWG's guide, consumers can fill their fridges and fruit bowls with plenty of healthy conventional and organic produce that isn't contaminated with multiple pesticide residue," said Sonya Lunder, a senior analyst in EWG.

    Only 25 years ago, the National Academy of Sciences raised concerns about exposure to poisonous pesticides in our food, yet consumers still consume a mixture of pesticides every day in America.