Recordings of angry bees are enough to send big, tough African elephants running away, a new study says. Beehives (蜂窝)—either recorded or real—may even prevent elephants from damaging farmer's crops.

    In 2002, scientist Lucy King and her team found that elephants avoid certain trees with bees living in them. Today, Lucy wants to see if African honeybees might discourage elephants from eating crops. But before she asked farmer to go to the trouble of setting up beehives on their farms, she needed to find out if the bees would scare elephants away.

    Lucy found a wild beehive inside a tree in northern Kenya and set up a recorder. Then she threw a stone into the beehive, which burst into life. Lucy and her assistant hid in their car until the angry bees had calmed down. Next，Lucy searched out elephant families in Samburu National Reserve in northern Kenya and put a speaker in a tree close to each family.

    From a distance, Lucy switched on the pre-recorded sound of angry bees while at the same time recording the elephants with a video camera. Half the elephant groups left the area within ten seconds. Out of a total of 17 groups, only one group ignored the sound of the angry bees. Lucy reported that all the young elephants immediately ran to their mothers to hide under them. When Lucy played the sound of a waterfall (瀑布) instead of the angry bees to many of the same elephant families, the animals were undisturbed. Even after four minutes, most of the groups stayed in one place.

Lucy is now studying whether the elephants will continue to avoid the sound of angry bees after hearing it several times. She hasn't tested enough groups yet to know, but her initial (最初的) results were promising enough to begin trials with farmers. She has now begun placing speakers in the fields to see if elephants are frightened away.

    The popular smartphone application Instagram (照片分享) has changed the way we look at photography, even our world. The photo-worthy moments we share serve as an important function in cultivating the photographic artistic eye.

    Instagram has got people to start noticing the art in their everyday life. It has also allowed us to share the artful moments in our lives with others. Clearly, making people focus on beautiful moments in their lives and how to share them is a positive takeaway from Instagram.

    Not only has Instagram changed the way we look at things around us, but it has also changed the way people view professional photography. Instagram has turned everyone with a smartphone into an artist. Opening up art to the general community is a groundbreaking (创新的) aspect of this application. Making artistic attempts accessible for everyone to discover their artistic talents and explore creatively is something that has made people find the beauty in the everyday. However, this accessibility has also created questioning around art and respect deserved by professional photography.

    The art in a professional photograph versus an Instagram can sometimes be hard to notice at a quick glance. But photographs taken by true professional photographers hold something that Instagram's can't match in terms of photographic quality, or advanced compositional knowledge.

    This is not to say Instagram is a lesser art. Aesthetic qualities of art are a personal matter and how good an artwork is depends on personal preferences. Good is a very arbitrary term in the art world. For example, I may find one photo more pleasing than another, but not everyone has to agree with me.

    The point I am trying to make is that professional photography should not be lost, but instead approached with a new, enhanced level of respect and admiration—despite how accessible, common and fun Instagram now makes the taking and sharing of photos.

    Today, many people use plants from other places to design their yards. Well, do they have any influence on animals living nearby? As we know, plants supply food for things like insects and plant-eating animals. In turn, birds and meat-eating animals feed on these insects and plant-eating animals. It is easy to see how important plants are.

    Although foreign plants may look beautiful, they can cause problems when there are too many of them. I live in Virginia, USA, and sometimes see a plant—commonly known as Kudzu—that seems to cover everything in the area, even climbing over whole trees and houses.

    Kudzu is an unbelievable plant since it grows very fast. It was first brought to the United States from south-east Asia around the 1870's as a crop that farmers could grow. However, Kudzu quickly came to be considered harmful throughout the southern United States.

    Since Kudzu grows fast in many different environments, it can completely cover areas of land quickly. The plant is also not eaten by any insects or birds in the United States so it can grow unchecked. Kudzu can cover trees, bushes, and even houses. It costs the United States 500 million dollars a year to just keep Kudzu from growing too fast. The plant is a perfect example of what scientists call an invasive (侵略性的) species, which grows more quickly than other native plants.

    All foreign plants have the possibility to spread quickly. Not only are they costly, but planting them in gardens actually takes away food from insects. If everyone filled their garden with plants native to where they live, many lovely butterflies and other native creatures would be attracted to their backyards! So, take a look out of your window — how does your garden grow?

    We all know cameras. But have you heard of Google's new camera? It is a small, smart device, called Clips. It comes with a case that has a clip (夹子), but it's not designed to be worn on your clothing. Most interestingly, it uses artificial intelligence to take photography out of your hands so it can capture moments on its own.

    This roughly 2-inch by 2-inch camera, with a three-hour battery life and Gorilla Glass for toughness, is intended for candid moments, like when a child does something cute that may happen too quickly for you to pull out your smart phone.

    Onboard the Clips device, it uses machine learning algorithms (计算程序) to help capture scenes. Those algorithms include face recognition. “Once it learns that there's a face you see frequently, it'll try to get nice photos of those faces,” said Juston Payne, the device's product manager. And they also want it to recognize facial expressions, which involved “training it to know what happiness looks like”. The Google team also trained it to recognize what not to shoot—like when a child's hand is over the lens, or if it is tossed in a dark purse.

    The only way to see the images is by connecting the camera with your phone, as it has no screen for viewing or editing.

    Did people think it was strange? Yes, Payne admitted. But they said they addressed that by making it obvious what it is. A green light on the front signals that the device is on. Besides, unlike a camera meant to monitor your home, it is not connected to the Internet.

    “This product is only possible because of the way that technology has advanced,” Payne said. It was only in the past year or so that they could squeeze the technology down into a device this size. Going forward, we're likely to get more assistance from the artificial intelligence packed into our apps and gadgets.

    In this Pennsylvania city, Pittsburgh is shrinking but getting wealthier. Since 2000, its population has declined by 95,000 while its income per capita (人均) has shot up 24 percent. The trend is taking hold in many other cities, like Buffalo in New York, Providence in Rhode Island and New Orleans.

    Some of these areas have created more high-paying jobs in energy, health care or education. Others have managed to reshape their producing industry for a new economy. Higher-paying jobs have a greater effect because they create demand for additional services. "The story in Pittsburgh is very positive, and other areas are looking at it as an example of the transformation that might be possible,” said Guhan Venkatu, who wrote an economic history of the area called “Rust and Renewal” for the Federal Reserve Bank of Cleveland.

    Carnegie Mellon University and the University of Pittsburgh have helped bring tech jobs and innovation(革新) to the area by sponsoring tech centers that help graduates start companies without moving to Silicon Valley or San Francisco. This has helped keep Pittsburgh's educated young population growing even as the entire population in the city has dropped.

    Pittsburgh has more STEM (science, technology, engineering and math) jobs than other shrinking cities, about 80, 000 or 7% of all jobs. STEM jobs add productivity and income growth to the area. Manufacturers of high-tech medical equipment in the Pittsburgh area also have doubled employment in the last 10 years.

    However, some experts question whether growing income per capita can really make up for a declining population. According to Patrick Adler, a researcher at the University of Toronto, population loss does matter if it means lower-skilled workers have fled because of a lack of opportunity. What's more, high-paying jobs in education and health care can disappear if the population declines too greatly. So it'd be wise to find ways to increase the population.

    The blooming of social media and interactive smartphone-based apps has proved that e-marketing is an unchangeable trend. In the case of China, the latest battlefield is beauty camera apps, which have become an overnight hit in the West.

    ⒈MeituPic

    Developed by the Xiamen-based Meitu Inc MeituPic is the company's flagship beauty camera app and was the first to become a big hit among Western users. The app has drawn some 456 million users, who use it to post more than 6 billion photos every month.

    In addition to MeituPic, Meitu Inc has developed a series of beauty camera apps such as Beauty Plus, Poster Labs and Meipai, each specializing in facial feature improvement, video editing and many other features.

    ⒉Pitu

    Tian Tian Pi Tu, is a beauty app developed by China's Internet giant Tencent. Similar to other photo-editing apps, Pitu offers a number of beautifying filters, blemish(瑕疵) removing tools and virtual makeup choices for users to choose from.

    Launched in 2014, Pitu has accumulated 106 million monthly active users (MAUs). While the number is not as impressive as that of Meitu's apps, some argue that the user base of Tencent's gaming products and chat applications, such as QQ and WeChat, gives Pitu great potential for further growth. According to Chinese app watchers, Pitu's target audience is younger and more individualized than that of MeituPic. 80 percent of Pitu's users are younger than 25, giving the app more room to try out more new features.

    ⒊FaceU

    In contrast with most other beauty apps, FaceU, focuses more on the social feature, encouraging users to video chat with friends and even strangers while playing with its fun stickers (贴纸) — and the strategy is undoubtedly working. Launched in 2016, the app, which mainly targets female users between 15 and 35, has twice made it onto the Apple store's Chart for top apps.