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.

    Nearly all of us have a bad habit, whether we know it or not. Some people say they want to get rid of (去除) it but don't know the proper ways. Here's some advice on how to get rid of bad habits.

    Make a list. Write down all the reasons why you want to stop a certain behavior, how it's hurting you and why to get rid of it, this will help a lot. Look at that list regularly.

    Join in other activities. It's wise of you to do something else when you want to stop your bad habit. If you get angry easily, for example, you can practice having a deep breath or going for a walk.

    Give yourself a present. Before you take action against a bad habit, decide what you'll do to celebrate it if you reach your goal.

    Keep off bad habits. If you are fat and want to lose weight, keep junk food out of your house. If you are a heavy smoker with coffee, turn to tea and keep away from friends who like smoking.

    Be patient. Bad habits develop over years, so you probably won't be able to get rid of them quickly. In fact, people often give up several times before being successful, so you should be patient.

    Find support. Don't be afraid to ask for support from friends, family or other people who have the same bad habits as you. When you talk to others, they might be able to provide advice or encouragement that you usually wouldn't get from yourself.

    On Sunday, May 25th, 2014, India's Malavath Poorna, became the youngest female to climb to the summit of the world's highest peak—Mount Everest. The 13-year-old girl surpassed (超越) the previous record holder, Nepal's Nima Chemji Sherpa, who accomplished the same achievement in 2012, at the age of 16.

    Unlike many young climbers who come from wealthy families, Malavath comes from a poor farming family living in a small village named Pakala in southern India.

    Most Pakala girls have never seen the inside of a school all their lives. Malavath is one of the fortunate ones that managed to realize their dreams thanks to Swaeroes, a welfare organization whose mission is to help India's poor children reach their full potential. They helped enroll (使入学) the young girl in a nearby boarding school. Then about nine months ago, Swaeroes provided her with the opportunity to achieve this dream by offering mountaineering training. Not one to pass up (错过) an exciting adventure, the athletic girl signed up.

    At the end of the two-week period, only two youngsters were selected for the dangerous climb—Malavath was one of them!

    Then came the big day. On April 15th, 2014, Malavath and 16-year-old Anand Kumar along with their guide Shekhar Babu and a team of Sherpas (夏尔巴人) began the dangerous 8,848-meter trek (艰苦跋涉). While most climbers attempt the peak from the slightly easier Nepalese side, this team had to go via the harder Tibetan side. That's because the government of Nepal does not allow anyone younger than 16 to climb up the route.

    It was not easy. In fact, Malavath was sent back to the base camp after she experienced altitude sickness when she got to the advanced base camp set up at an altitude of 6,400 meters. However, the youngster returned three days later, and insisted on continuing. It took 52 days, but on May 25th, 2014, Malavath, who made it to the summit a few minutes ahead of 16-year-old Anand, proudly raised her country's flag at the top of the world. The young girl hopes that her achievements will inspire poor girls all over the world to try to achieve their dreams.

    Whether you are young or young at heart, it is never too late to change, or take in some new and better practices into your daily life. Here are some wise lessons that I wish I knew when I was younger.

    I used to be worried about what others thought of me. Finally, I changed. Remember that if you're wasting too much time looking for respect(尊重) from others, then you will not have time to finish all you desire(期望).Everyone has an opinion, but in fact others' opinions about you are based more on their history and perceptions(观念) than anything you're actually doing. So depend on your own assessment(评估) of you rather than others'.

    Enjoy every moment of today. Don't wait to do or enjoy anything. Don't tell yourself you will do it tomorrow. If it is important to you, then do it today. Pay attention to what is happening now, the task at hand and all the choices you make today, big and small. Our future is set by what we decide and do today.

    What happened yesterday is over. You can not change it. So let it go. Don't waste your energy considering anger or unhappiness. It only stops you from moving forward in life.

    Look for the good in people. Celebrate the happy moments, big and small. Search for the chances for growth. Give helpful encouragement rather than unwanted criticism (批评). Be helpful whenever possible.

    In a word, life is serious but you can still be delighted and hopeful. Otherwise, what's the point?

    “Has anyone seen Charge?” I asked, only half expecting a reply. The kids were running around the house, each doing their own thing, and my husband was watching the football game. Since she had only been out of sight for a few hours, I wasn't overly concerned. I thought she must be under one of the kids' beds, hiding from all the mess that was normal for a Sunday afternoon in our home.

    ①

    Charge was not good-looking, to put it kindly. It wasn't her fault; she was simply gifted with the worst appearance traits（特征）in her background.

    My husband had found Charge wandering along the freeway one day on his way home from work. She looked as though she hadn't eaten in weeks, so he stopped and fed her with bits of his leftover lunch. Not knowing what to do, he brought her home with the hope of finding her owners or at least a loving family that would take her. However, once she was in the house, the kids were determined not to let her go. After a day or two of begging, we unwillingly gave in and told them we could keep her.

    After observing her actions for days, I found she was extremely distrustful and afraid of everyone. In time, though, she came to love the kids and slept on their beds every night. I wondered if what she had experienced had conditioned her to be protective of those who were hurting. Every time the kids cried, Charge would run to them and gently offer her comforting paw（爪子）. Unlike our cat, who had recently given birth to five kittens, Charge would have been a great mother.

    ②

    When I was finally able to get everyone's attention at the dinner table, I asked again if anyone had seen Charge. After a unanimous（异口同声的）“No”, I decided to take a look around the neighborhood.

    ③

    “Charge!” I cried, because there she was in the closet! She looked up at me from inside the little cats' box as if to say,“ Shhh, I just got them to sleep!”

    We usually kept the closet door open a bit so our mamma cat could go in and feed her kittens, but she always left as soon as she finished nursing. Obviously, Charge knew they needed more mamma time and was more than willing to help out.

    ④

    The kids smiled upon seeing the dog with the kittens. My husband shook his head and said, “Only you, Charge. Only you!”

    Charge continued to mother the kittens until they were placed in their new homes. Charge may not have been an attractive dog, but she truly had her inner beauty.

    Although it's great to spend vacations seeing the world with family, friends, or a lover, traveling alone can also be completely incredible. A solo adventure has the potential to be life-changing. Here are some reasons you should travel alone at least once.

    If you enjoy meeting new friends, here's your chance; you will likely find some when traveling alone, Since you won't be focused on talking to anyone you know, you'll be more likely to strike up conversations with strangers. Meeting people from different backgrounds opens our minds, expands our world, and can inspire us a lot. You may meet some amazing locals or other adventurers like yourself; either way you're bound to make some new friends during your journey.

    A trip alone can ignite your creativity. Spending time alone with an open mind can be exactly what you need for your imagination to soar. Your enthusiasm and passion for life may sky-rocket from your awesome adventure.

    When traveling with a partner or a group, every idea can be bounced off someone else. When you travel alone, you will learn to be decisive; you will be making every decision alone. From where to eat, to what time to wake up, to what sights to see, and which airline to use, traveling solo forces you to rely on yours truly. As you realize you can make good choices without help from others, you will likely trust your instincts more, and this new found self-assurance and confidence will be helpful in many areas of your life.