Sometimes you'll hear people say that you can't love others until you love yourself. Sometimes you'll hear people say that you can't expect someone else to love you until you love yourself. Either way, you've got to love yourself first and this can be tricky. Surely we all know that we're the apple of our parents' eyes, and that our Grandmas think we're great talents and our Uncle Roberts think that we will go to the Olympics，but sometimes it's a lot harder to think such nice thoughts about ourselves. If you find that believing in yourself is a challenge, it is time you build a positive self-image and learn to love yourself.

    Self-image is your own mind's picture of yourself. This image includes the way you look, the way you act, the way you talk and the way you think. Interestingly, our self-images are often quite different from the images others hold about us. Unfortunately, most of these images are more negative than they should be. Thus changing the way you think about yourself is the key to changing your self-image and your whole world.

    The best way to defeat a passive self-image is to step back and decide to stress your successes. That is, make a list if you need to, but write down all of the great things you do every day. Don't allow doubts to occur in it.

    It very well might be that you are experiencing a negative self-image because you can't move past one flaw or weakness that you see about yourself. Well, roll up your sleeves and make a change of it as your primary task. If you think you're silly because you aren't good at math, find a tutor. If you think you're weak because you can't run a mile, get to the track and practice. If you think you're dull because you don't wear the latest trends, buy a few new clothes. But remember, just because you think it doesn't mean it's true.

    The best way to get rid of a negative self-image is to realize that your image is far from objective, and to actively convince yourself of your positive qualities. Changing the way you think and working on those you need to improve will go a long way towards promoting a positive self-image. When you can pat yourself on the back，you'll know you're well on your way. Good luck!

    Tenzing left his home when he was ten to work and help his mother, who was looking after their 2-acre ancestral farm after his father's death. He did temporary jobs for the first few years and then joined a Malaysian construction firm, where he learnt to drive, repair machines, work on the Internet and even speak English fluently.

    “In those 13 years, I learnt everything—driving, mechanic work, and how to set up a small factory. This made me gain much confidence to do almost all jobs,” says Tenzing.

    However, as his mother was getting older, on December 12, 2006, Tenzing returned to his hometown in Assam. Having visited several farms, he came to know that tea could be easily exported and many tea companies were buying tea; so he also decided to grow tea on his farm. But as his family had never grown tea, he had no idea how to do it.

    Being a green hand in this field, Tenzing went to meet with many tea experts and followed their instructions. But whenever he sprayed pesticide (农药)on his farm, he'd get a headache and feel indisposed. So he started looking for alternatives. Tenzing did his research online and finally in 2007, he connected with people from a Canadian non-governmental organization and invited them to his farm, where they trained him. Thus, Tenzing started growing tea organically.

    Today Tenzing has 25 acres of land, of which 7.5 acres is used for tea planting, and he grows almost all types of fruits and vegetables. His success inspired many, and farmers from other parts of the country also started coming to his farm to learn organic farming. He has trained about 30,000 farmers so far. Every year almost 100 tourists visit his farm from various parts of the world like the UK, Australia, Germany, etc.

    San Francisco has long been a favorite place for travelers who are ready to learn languages. The mild (温和的) year-round climate, shops and restaurants, bars and night life, and some of the most beautiful scenery attract many visitors to this relaxing and welcoming city. Students are sure to find the San Francisco Bay Area a fun, safe and friendly place to live and study. This is the most important.

    English School in San Francisco lies in the heart of the city. It is one of the best San Francisco English language schools. You can see views of the city from your classroom! Many buses stop less than a five-minute walk from the school, which is also just a two-minute walk from the famous Union Square, San Francisco Shopping Centre, the Financial District, Yerba Buena Gardens and the Museum of Modern Art. The school is minutes away from the cable cars (缆车) to Chinatown and Fisherman's Wharf.

    San Francisco is a great place to study English and learn about American culture, offering excellent opportunities in sports, entertainment and arts. The city borders (毗邻) excellent beaches, and you can sail or surf all year round.

    San Francisco has more restaurants than any other city in the US, and is the home of many theaters, music and dance companies, as well as museums. Just walking through many areas of San Francisco, you are certain to find something wonderful.

    Long before iPhone, the cigarette was the companion of choice for restlessness. And long before Facebook and WeChat, it was tobacco that promised to better your social life. Now, quitting smartphones has become the new quitting smoking.

    Of course, technology does not yellow your teeth, cause disease or lead to cancer. But some individuals are so concerned that device addiction is damaging their mental health. In order to reduce their dependence, even in Silicon Valley, people are turning off the messages that constantly buzz for their attention, banning smartphones from the bedroom and, curiously, changing the colors on their screens to a less tempting scale of gray.

    The big tech companies will have to work out how to respond to this new generation of quitters. Facebook is the first to go public with its attempt, hoping its recent move can make the social network more homely.

Last year the tech industry got a bad name —Big Tech—with unfortunate echoes of other industries that have faced fierce opposition, including Big Tobacco. Like them, the tech industry has to reduce concern from a new generation of activist shareholders （股东） that are questioning its role in the world. These campaigns are never as fierce as those faced by Big Tobacco. In the 1990s, socially responsible investors refused to put money in tobacco stocks.

    It is far difficult for investors to challenge Big Tech and hard to separate the good these companies do in the world-connecting old friends and giving space for people to share their ideas-from the bad. In the meantime, stopping using technology remains problematic. In The World Without Mind: The Existential Threat of Big Tech, Franklin Foer argues that tech should be seen in a similar way to junk food: a convenience that some reject for more continuing nutrition.

    So we need to do more to turn the tide. In the same way that public service announcements made smoking around your children taboo （禁忌）, we can warn parents against losing themselves in their smartphones while taking care of kids. We can also create no-smartphone zones at dinner. Eventually smartphones could be banned from all public places and help us give our attention to the people around us instead.

    A food chain is a simple way of explaining how each living thing gets its food. For example, a simple African food chain might consist of three parts: first, trees and bushes; second, giraffes; and third, lions. Each link in a food chain is food for the next link. Food chains always start with plants and end with animals.

    Plants are at the bottom of the food chain. Scientists call them producers, because they use light energy from the sun to produce food from carbon dioxide and water through photosynthesis（光合作用）. Animals, unlike plants, can't produce their own food. Instead, they must eat plants or other animals. This is why scientists call them consumers.

    Consumer animals fall into three categories. Herbivores（食草动物）eat only plants. Carnivores（食肉动物） eat only other animals. Omnivores eat both plants and animals. In addition to producers and consumers, there are also decomposers(分解者).These organisms, such as bacteria and fungi, feed on decaying(腐烂) matter. They help the food chain by speeding up the decaying process that releases minerals back into the soil to be absorbed by plants as nutrients.

    Most food chains have only four or five links in them. As you go up a food chain, the amount of energy at each level diminishes, because some of the energy is lost in the form of waste or is used up by the organism at the level. That is why it takes many plants, for example, to feed a few giraffes who in turn feed one lion.

    Most animals are part of many different food chains, because they must eat more than one type of food to satisfy their energy needs. All of these interconnected food chains form a more complex structure called a food web. Humans, for example, are at the center of a very complex food web, because we tend to eat many different types of plants and animals.

    It is true that summer is hot. But here is something to make your day easier. Are you prepared? Meet the new AirFreez— an alternative to traditional Air Conditioners that cools you just the same!

    How does it work?

    It is surprisingly easy to set up! You just need to plug it into a socket(插座)OR any USB port (it uses so little energy that it can even run off of a phone or laptop battery).

    Once you have done that, simply fill it with 20oz/0. 6L of cold tap water.

    Now just press the power button and the instant cool air is here!

    What is so special about this little box?

    It is no larger than a lunchbox. It can be powered by a pocket solar panel（电池板）or battery pack and you probably have the world's first and most portable AC unit.

    Bad sleepers are putting the AirFreez next to their beds at night. The relaxing blow of cool, clean air, the comforting soft night light and the quiet create the perfect sleeping conditions!

    The price is just amazing. Most AC units cost at least $ 300+ AND you have to pay more to cover the expensive electricity bills each month. AirFreez costs less than $ 100 (actually $ 53 if you buy more than one here).

    Top Tips:

    To make your air even cooler—add a bottle of cold tap water from your refrigerator or even ice!

    For a beautiful relaxing atmosphere—add a few drops of fragrant oils to the water!