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.

It is OK not to be OK

    This is the simple encouragement people often use for themselves or others. But for professional athletes, this can be the hardest sentence to say.

    On March 6, Cleveland Cavaliers forward Kevin Love posted an article titled “Everyone is Going Through Something” on the website The Players' Tribune. In the article, the 29-year-old showed how he suffered from his first panic attack on Nov 5 in a game against the Atlanta Hawks and why he was so worried about sharing his story with the public.

    Love identified that what keeps people from speaking up about their mental health challenges is the fear that many people see them as a weakness. “Growing up, you figure out really quickly how a boy is supposed to act. You learn what it takes to 'be a man'. It's like a play book: Be strong. Don't talk about your feelings. Get through it on your own,” he wrote.

    And being an NBA player made his situation even more difficult. Love was afraid to share his struggles because he didn't want his Cavaliers teammates to think that he was unreliable.

    However, as it turned out, Love's teammates understood and supported him. Cleveland superstar LeBron James even wrote on social media that Love is “even more powerful now than ever before”.

    For Love, it was a journey of empowerment to accept and address his mental illness and share his experience with millions of people who face the same problems. In fact, he was inspired to talk about his situation by Toronto Raptors shooting guard DeMar DeRozan, who had also opened up about his mental health issues.

    Last month, the 28-year-old told the Toronto Sun that despite being a top-performing and wealthy NBA player, he still deals with constant blues. “It's one of the things that no matter how indestructible (坚不可摧的) we look like we are, we're all human at the end of the day, ”he said. “Sometimes…it gets the best of you, when everything in the whole world's on top of you, ” But other times, by admitting who we are, we can get what we want. As Love told Advance Ohio Media, “You have to let some of that stuff bleed out in order to fully recover from it.”

    Have you ever been to London? Here is some hotel information for you.

    Kingsway Hall Hotel

    We offer quality service (优质服务) in Kingsway Hall Hotel. This location puts guests in easy reach of many places, such as the British Museum and Piccadilly Circus. Our hotel also has modern Western food, and offers a perfect dining environment. The lounge bar is a comfortable place to enjoy a drink while watching the tourists. There are hundreds of dining choices within walking distance. Non-smoking rooms are ready for guests.

    Hilton Docklands Riverside

    Located on the bank of the Thames, our hotel is about two miles east of Tower Bridge and 36 miles from London Heathrow Airport. Our hotel has a beauty salon, a flower shop and a swimming pool. The hotel also offers different kinds of service：laundry (洗衣店) services, babysitting, shining shoes, and local area transportation.

    Windermere Hotel

Located in the center of London, our hotel puts guests within easy reach of London's well-known buildings. Buckingham Palace and the Royal Parks are just a short walk away. Within 1.5 miles you can visit Westminster Abbey and the Houses of Parliament. The theatres, Harrods shopping centre, and the designer shops of Sloane Square and Knightsbridge are all only a short walk away or a taxi ride away.

    When Johnny, a homeless man, spent his last $20, he wasn't looking at it as an investment — but it's about to pay him huge profits. After he helped a woman who ran out of gas, she returned the favor by raising a lot more on the Internet.

    Kate McClure, 27, was driving to visit a friend when she ran out of gas halfway. “He saw me pull over and knew something was wrong,” she wrote. “He told me to get back in the car and lock the doors. A few minutes later, he came back with a red gas can, using his last 20 dollars to make sure I could get home safe.”

    She couldn't repay him at that time because she had no cash with her. “I have been stopping by his spot for the past few weeks. I repaid him for the gas and gave him some clothes.”

    Kate decided to do more for him, so she started a crowdfunding(众筹) campaign on GoFundMe.com, and it quickly gained far beyond its initial $10,000 goal. When it reached $100,000, the fundraising page was shut down for a time at Johnny's request. Because he didn't want to seem like he was taking advantage of the situation. Finally, Kate said that she restarted it because the public interest had not decreased. She also added that Johnny planned to donate the rest to a good cause.

    According to the New York Post  Johnny wants to get a job at an Amazon warehouse and a department manager from the tech company has already reached out, saying he wants to help Jonny.

    The world we live in gets more mechanized every year. Some countries which were mainly agricultural a hundred years ago have now become industrial. New factories and towns have been built on good agricultural land. There are now fewer farms to serve a much greater population, so these farms must be more efficient in order to produce as much food as possible. There is no place in the modern agricultural world for the inefficient farmer. Unfortunately, many of the picturesque aspects of farming are disappearing in the search for efficiency. The more tractors are used, the fewer horses are needed. Everyone agrees that horses are far more pleasant to look at than tractors. But they are less efficient. Cows are usually milked by machinery nowadays, and even pigs are fed automatically. There is not much art or poetry on the modern farm, and the old traditional idea of a farm as a slow, peaceful, romantic place is totally wrong nowadays.

    The modern farmer has to be a mechanic, a scientist, an accountant and a gambler. The more mechanized farming becomes, the more expert the farmer has to be. He must understand what machinery is necessary for his kind of farm, and he must know how to use it efficiently. He must also understand the new technical advances in agriculture, and how to use chemical and synthetic products to improve his crops. The more workers a farmer employs, the more he must know about the problems of wages and taxes. As in any other industry, most modern farmers find it necessary to employ office staff to deal with these. But although he has more modern equipments and far more scientific aids than his grandfather had, the farmer is still dependent upon the weather. As he can never be sure what the weather will do, he must be prepared to take risks, and face the possibility of losing everything.

    In March 2008, I told my friends: I was going to shut down my law practice and travel around the world in a year. What's more, I'd do it without taking any flights or making a single advance (预先的) reservation. Some friends offered support and encouragement, while others were doubtful. Once I'd said the words, there was no turning back. It took months to shut down my law practice and get things in order.

    There really wasn't any great reason why I wanted to circle the world. I simply wanted to do something fun and different. When I had this plan, I didn't plan for it to lead to a life on the road forever. I was planning to come back, open a new law practice and write a hugely successful book about my travels. Before I left, I started a travel blog, which served as a way to take notes for the book.

    Once I set off on my trip in December 2008, I found that travelling without using planes was not easy. It took seven days and nights on trains to get from Moscow to Beijing. Sometimes, I wouldn't see a village or a human being for 10 hours. I had a whole cabin to myself from the second day of that journey.

    It turned out that travelling with no reservations was far less difficult than I had imagined. Pulling into a city on a bus with a bag, looking in a guidebook for a few suggestions of accommodations (住宿), and then finding an empty room was never a problem.

    Soon after I started this adventure, I realised that my return to the US would be temporary (暂时的). About three months into my journey, I realised that I didn't want to go back to my old life. The world is so wonderful and I wanted to see as much of it as I could.