Elephants in Uganda are starting to come close to villages near national parks. The big animals are a real danger to people.

    So, the Uganda Wildlife Authority has been giving people new tools to keep the elephants away: vuvuzelas. They are plastic instruments some fans use at sports events.

    The instruments make a loud sound elephants do not like. The animals leave, and no one is harmed. A spokesperson for the Uganda Wildlife Authority says vuvuzelas work because they do not threaten the elephants. That is important because an elephant that feels threatened is more likely to attack. So far, no one has reported an elephant attacking in answer to a vuvuzela.

    Officials and villagers have tried other ways to stop elephants from coming near farms and houses. They have built beehives – houses for flying insects that sting. They have hung ropes covered in spicy oil. They have dug long, deep holes. And they have used guns, called A-K47s.

    An official from the Uganda Wildlife Authority explains that people shoot the gun in the air to scare the elephant. But over time, the elephants have stopped being afraid of the sound of the gun. They only look at the shooter and wave their ears.

    Another official for the Uganda Wildlife Authority, Gessa Simblicious, says one elephant-prevention solution will not work everywhere in Uganda. And one day, elephants may accept the vuvuzela noise, just as they do the sound of the A-K47.

    But right now, vuvuzelas are an effective, non-violent and fun way to deal with a serious problem.

    We know that hugs make us feel easy inside. And this feeling could actually ward off stress and protect the immune (免疫) system,  according to a new research from Carnegie Mellon University.

    It's a well-known fact that stress can weaken the immune system. In this study, the researchers sought to determine whether hugs could protect individuals from the increased sensitivity to illness brought on by the particular stress that comes with interpersonal conflict.

    "We know that people experiencing ongoing conflicts with others are less able to fight off cold viruses. We also know that people who report having social support are partly protected from the effects of stress on psychological states, such as depression and anxiety," the study's lead author, psychologist Dr. Sheldon Cohen , said in a statement. "We have tested whether awareness of social support is equally effective in protecting us from sensitivity to infection caused by stress and also whether receiving hugs might partially account for those feelings of support and thus protect a person against infection."

    In the experiment, over 400 healthy adults filled out a questionnaire about their perceived (感知到的) social support and also participated in a nightly phone interview for two weeks. They were asked about the frequency that they engaged in interpersonal conflict and received hugs that day.

    Then, the researchers exposed the participants to a common cold virus, and monitored them to assess signs of infection. They found that both perceived social support and more frequent hugs reduced the risk of infection associated with experiencing interpersonal conflict. Regardless of whether or not they experienced social conflicts, infected participants with greater perceived social support and more frequent hugs had less severe illness symptoms.

    "This suggests that being hugged by a trusted person may act as an effective means of conveying support and that increasing the frequency of hugs might be an effective means of reducing the effects of stress," Cohen said. "The apparent protective effect of hugs may result from the physical contact itself or hugging being a behavioral indicator of support and closeness. Either way, those who receive more hugs are somewhat more protected from infection."

    If you need any more reason to wrap your arms around someone special, consider this: hugs also lower blood pressure, reduce fears, improve heart health and decrease feelings of loneliness.

    On May 29, 1973, Thomas Bradley, a black man, was elected mayor of Los Angeles. Los Angeles is the third largest city in the United States, with a population of three million. About sixteen percent of the city's population are black.

    News of this election appeared on the front pages of newspapers everywhere in the United States. Here is how one major newspaper reported the event.

    LOS ANGELES ELECTS BRADLEY MAYOR UNSEATING YORTY

    BLACK WINS 56% OF VOTES

    Bradley called his victory over Yorty "the fulfillment of a dream". During his childhood and youth, people had kept telling him, "You can't do this, you can't go there, because you are a Negro." Nevertheless he had won a decisive victory over a man who had been won 43.7 percent.

    Los Angeles voters have had many opportunities to judge. Thomas Bradley had to form an opinion of him. The son of a poor farmer Texas, he joined the Los Angeles police force in 1940. During his twenty-one years on the police force he earned a law degree by attending school at night. He was elected to the city council years ago.

    At the time of the Los Angeles election, three other American cities already had black mayors, but none of these cities had as large a population as Los Angeles. Besides, the percentage of blacks in those other cities was much larger. Cleveland, Ohio, had thirty-six percent black when Carl Stokes was elected mayor of Cleveland in 1967. In the same year Richard Hatcher was elected mayor of Cary. In Newark, New Jersey, sixty percent of the population were black when Kenneth Gibson was elected in 1970. Thus election of a black mayor in those cities was not very surprising.

    In Los Angeles, thousands of white citizens voted for Thomas Bradley because they believed he would be a better mayor than the white candidate. Bradley had spent forty-eight of his fifty-five years in Los Angeles. Four years ago, Bradley lost mayoral election to Yorty. This time Bradley won.

    The market watchdog(市场监督部门) in northwest China's Xi'an has started a survey into a complaint that a woman's newly bought Mercedes-Benz car has engine oil leaks(漏). The incident has attracted wide attention after a video of a woman sitting on top of a Mercedes-Benz while weeping and arguing with salesmen went viral online. In the video posted on Weibo by a net friend on April 11, the woman said she found an oil leak when she was driving the car home from the 4S store. After she drove the car back, the trader claimed the car had passed all tests before it was sold. She was told she couldn't get her money back nor change a new car for her. All that the trader could offer was to change the engine. The CLS300 car cost around 660,000 yuan($98,445).

    The customer met with officials from the market watchdog of Gaoxin District on Saturday, requesting a full maintenance(维修) history of the car and an independent test by a third-party, Shaanxi TV Station reported.

    Mercedes-Benz issued an announcement on its Weibo account on Saturday, saying it was sorry for the customer's "unpleasant experience". The company has sent a team to Van to help solve the issue.

    Li Yong, an official with the market watchdog of Gaoxin District in Xi'an, told cnwest.com that they learned about the incident online. They are still surveying the incident. They will punish those who are responsible if anything illegal is discovered.

    Are you familiar with the greeting, "Can I add you on WeChat?" It seems like every time we meet new friends or colleagues nowadays, the first thing that springs to mind is adding each other on the app. Nevertheless, more than 80 percent of WeChat users report feeling stressed or anxious when they receive a large number of messages, according to a study done recently by the app's developer Tencent(腾讯). In other words, WeChat can overwhelm(使应接不暇) us, while also breaking down the boundaries between our work and private lives.

    Just think how easy it is now for bosses to hand out assignments during the holiday, so long as they have your WeChat contact. When you're at the cinema enjoying a romantic movie or having a barbecue in the backyard, you can never cut yourself off from the outside world unless you switch off your phone. Not to post something in WeChat Moments before replying to your boss first!

    Apart from interrupting your leisure time, WeChat can also reduce your productivity at work. For many office workers, logging in to WeChat on their computers at the start of the day has become routine. But what if browsing the Moments distracts us from doing the work? The app steals our time without us even noticing it, making us have the false belief that we are busy all the time.

    And as if that weren't bad enough, there're the "one-off" friends who take up space on our WeChat friend list. A handy way to check how many one-off friends you have is to take a look at your chat history with them. Sometimes, you only sent the initial friend requests so you could invite them to a WeChat group or inform them of something for your boss. Yet still, as your friend count(好友数量) ever goes up, it can make you feel the need to post selfies(自拍) and share details of your life in your Moments, just so you can stay up to date.

    With WeChat, all our spare time is swallowed up by the constant torrent of messages and our attention keeps getting diverted by Moments and pop-up ads. So it's time that we should do something to nip this problem in the bud.

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