Last spring, I was fortunate to be chosen to join in an exchange study program. The moment I arrived in Paris, I was greeted by a nice French couple who would become my host parents. The bit of French I had taken in high school began coming out of my mouth; speaking the language would only become more natural over the course of the term. At the airport, we all got into the couple's car and began the journey to their townhouse. We talked the whole way, getting to know one another.

    Every day afterwards, I would eat breakfast with the two of them, and then we'd all go our separate ways for the day. In the evening, my host mother would make delicious dinners for the three of us. My experience was exciting until I received some shocking news from my program coordinator（协调人）: There had been a death in my host parents' family and they would have to go away for several weeks to deal with all the business that arises from the death. That afternoon, I had to move out of one family's house and into another.

    The coordinator told me I'd have a roommate and asked whether I would mind sharing a bedroom with an English speaker. To avoid speaking my native language, I asked not to be placed with an English-speaking roommate. When I got to my new room, I introduced myself to my new roommate Paolo, a Brazilian（巴西人）, the same age as I, whom I was surprised to find playing one of my favorite CDs on his computer! In just a few hours, we knew we'd be good friends for the rest of the term.

    I left France with many stories, so when people ask me what my favorite part of the trip was, they always hear about my Brazilian friend Paolo and the weekdays in class, weeknights on the town, and weekends exploring France we enjoyed together. I would recommend an exchange program to anyone who wants to experience foreign cultures and gain meaningful friendships.

    On a stormy day last August, Tim heard some shouting. Looking out to the sea carefully, he saw a couple of kids in a rowboat were being pulled out to sea.

Two 12-year-old boys, Christian and Jack, rowed out a boat to search a football. Once they'd rowed beyond the calm waters, a beach umbrella tied to the boat caught the wind and pulled the boat into open water. The pair panicked and tried to row back to shore. But they were no match foritand the boat was out of control.

    Tim knew it would soon be swallowed by the waves.

“Everything went quiet in my head,” Tim recalls（回忆）. “I'm trying to figure out how to swim to the boys in a straight line.”

    Tim took off his clothes and jumped into the water. Every 500 yards or so, he raised his head to judge his progress. “At one point, I considered turning back,” he says. “I wondered if I was putting my life at risk.” After 30 minutes of struggling, he was close enough to yell to the boys, “Take down the umbrella!”

    Christian made much effort to take down the umbrella. Then Tim was able to catch up and climb aboard the boat. He took over rowing, but the waves were almost too strong for him.

“Let's aim for the pier（码头）,” Jack said. Tim turned the boat toward it. Soon afterward, waves crashed over the boat, and it began to sink. “Can you guys swim?” he cried. “A little bit,” the boys said.

Once they were in the water, Tim decided it would be safer and faster for him to pull the boys toward the pier. Christian and Jack were wearing life jackets and floated on their backs. Tim swam toward land as water washed over the boys' faces.

    “Are we almost there?” they asked again and again. “Yes,” Tim told them each time.

    After 30 minutes, they reached the pier.

    There's a curious thing about people.All of us are driven in some way or another to achieve—we want to run faster,be more creative,win more awards,and earn more money.But here's the thing: if you want to offer warm words of wisdom,constructive criticism or "360-degree feedback",then think again.Most of us would rather not hear it.

    Our easily-broken egos（自尊心）are partly to blame.We all want to meet our own expectations of ourselves,and so being critised can present a huge threat to our egos.Yet as decades of psychological theory and research have indicated,people have endless tricky strategies of remaining positive in the face of criticism.For this reason,rather than us welcoming feedback with open arms,our first response is often an automatic defense.These reactions serve to make us feel better about ourselves.

    Psychological research exposes this unhealthy appetite for ignorance.In one study,students watched a false educational film about a serious disease called "TAA Deficiency".In fact,TAA Deficiency is completely fictional,but the students were not told this information;instead,they were asked whether they wished to provide a cheek test for assessing（评估）their risk of developing the disease.Half of the students were told that if they ever developed TAA Deficiency,then the treatment would involve them taking a two-week course of pills.Of this group,52% agreed to provide the cheek test.The other half of students learned the treatment would involve taking the pills for the rest of their lives.Of this group,only 21% agreed to the test.

    These findings show a common pattern seen in other studies within and beyond the context of healthcare.That is,people are especially resistant to hearing feedback when they believe it could force them to do something difficult or unpleasant.

    Actor Warwick Davis realized he was shorter than other people when he was eight years old.  He suddenly noticed all his schoolmates were twice his size. It was then that the effect of having dwarfism hit him for the first time.

    Now aged 48, Davis says, "I have very fond memories of school but I realized I had to become a little bit louder and funnier so I wouldn't get left out of conversations. I became quite the performer, so being short was my training in acting."

    It worked. Director George Lucas cast young Warwick as the Ewok Wicket in Return of the Jedi. The actor has gone on to star in many TV shows and films, including playing Professor Flitwick in the Harry Potter films.

    Warwick's dwarfism means he is 1.07 meters tall, while the average UK adult male height is 1.78 meters. Most types of dwarfism are caused by a genetic disorder that stops some of the body's building blocks working properly.

    Davis has a positive attitude to being "different". He says, "If I had my life all over again, I would choose the same job and be the same height. I have enjoyed every minute. At school I played rugby and football and tried long jump and high jump. I wasn't very good at them but I always had a go. I defeated everyone at chin-ups (引体向上) because I had a low body weight combined with a strong upper body from climbing up to the top cupboards to reach the biscuit boxes at home."

    Warwick is supporting Jeans for Genes Day, a charity raising public concern for millions of children born with genetic disorders in the U.K. He says, "Even if you can only give a tiny amount of money, it will make such a difference to the children."

    The fiddler crab (蟹) is a living clock. It indicates the time of day by the colour of its skin, which is dark by day and pale by night. The crabs changing colour follows a regular twenty-four hour plan that exactly matches the daily rhythm (节奏) of the sun.

    Does the crab actually keep time, or does its skin simply answer to the sun's rays, changing colour according to the amount of light strikes it? To find out, biologists kept crabs in a dark room for two months. Even without daylight, the crab's skin colour continued to change exactly on time.

    This characteristic(特性) probably developed gradually in answer to the daily rising and setting of the sun, to help protect the crab from sunlight and enemies. After millions of years it has become completely regulated (受控制) inside the living body of the crab.

    The biologists noticed that once each day the colour of the fiddler crab is especially dark, and that each day this happens fifty minutes later than on the day before. From this they discovered that each crab follows not only the rhythm of the sun but also that of the tides (潮水). The crabs period of greatest darkening is exactly the time of low tide on the beach where it was cought!

A video of dolphins playing in the wake of the waves near a man-made island, east of the Hong Kong-Zhuhai-Macao Bridge, has caught the attention from netizens across China.

The 55-km Hong Kong-Zhuhai-Macao Bridge is the world's longest cross-sea bridge, connecting the mainland province of Guangdong with the country's two special administrative regions, Hong Kong and Macao.

During the nine-year bridge construction period, researchers have identified and registered a total of 2,367 dolphins, with no injuries of any dolphins reported.

According to local authorities, the Pearl River Estuary Chinese White Dolphin Reserve has supported more than 100 researchers in studying and protecting the mammal and trained thousands of dolphin watchers. Luo Guocai, a certificated dolphin watcher, said his duty was to conduct a 10-minute observation of the sea each time before construction started. The dolphins have to breathe every few minutes above the water, and in order to prevent potential harm, the watchers would knock on their boat a few times to scare them away.

The preservation efforts never stopped even after the construction was completed. "Managerial personnel will continue to monitor the nearby environment and the dolphins via intelligent equipment including the bridge video surveillance(监控) system, the underwater tunnel's environmental monitoring as well as specially established research and observation stations on the man-made islands," said Yu Lie, deputy director of the bridge management bureau.

"Currently, Hong Kong, Macao, the country's two special administrative regions, and Guangdong plan to establish a conservation alliance for the dolphins, involving non-governmental organisations in the routine rescue, information sharing, and scientific research," said Chen Hailiang, head of the administration of the reserve. "We are constructing a bigger rescue and conservation base as well as increasing tissue samples and gene banks in a bid to better preserve the dolphins for generations to come," Chen said.