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    Suppose you're in a rush, felling tired, not paying attention to your screen, and you send an email that could get you in trouble.

    Realisation will probably set in seconds after you've clicked “send”. You freeze in horrors and burn with shame.

    What to do? Here are four common email accidents, and how to recover.

    Clicking “send” too soon

    Don't waste your time trying to find out if the receivers has read it yet. Write another email as swiftly as you can and send it with a brief explaining that this is the correct version and the previous version should be ignored.

    Writing the wrong name

    The sooner you notice, the better. Respond quickly and briefly, apologizing for your mistake. Keep the tone measured: don't handle it too lightly, as people can be offered, especially if your error suggests a misunderstanding of their culture(i.e. incorrect ordering of Chinese names).

    Clicking “reply all” unintentionally

    You accidentally reveal(透露)to entire company what menu choices you would prefer at the staff Christmas dinner, or what holiday you'd like to take. In this instance, the best solution is to send a quick, light-hearted apology to explain your awkwardness. But it can quickly rise to something worse, when everyone starts hitting “reply all” to join in a long and unpleasant conversation. In this instance, step away from your keyboard to allow everyone to calm down.

    Sending an offensive message to its subject

    The most awkward email mistake is usually committed in anger. You write an unkind message about someone, intending to send it to a friend, but accidentally send it to the person you're discussing. In that case, ask to speak in person as soon as possible and say sorry. Explain your frustrations calmly and sensibly—see it as an opportunity to clear up any difficulties you may have with this person.

    Have you ever found yourself in this situation: You hear a song you used to sing when you were a child — a bit of nostalgia (怀旧) or “blast from the past,” as we say. But it is not a distant childhood memory. The words come back to you as clearly as when you sang them all those years ago.

    Researchers at the University of Edinburgh studied the relationship between music and remembering a foreign language. They found that remembering words in a song was the best way to remember even one of the most difficult languages.

    Here is what they did. Researchers took 60 adults and randomly divided them into three groups of 20. Then they gave the groups three different types of “listen-and-repeat” learning conditions. Researchers had one group simply speak the words. They had the second group speak the words to a rhythm, or beat. And they asked the third group to sing the words.

    All three groups studied words from the Hungarian language for 15 minutes. Then they took part in a series of language tests to see what they remembered.

    Why Hungarian, you ask? Researchers said they chose Hungarian because not many people know the language. It does not share any roots with Germanic or Romance languages, such as Italian or Spanish. After the tests were over, the singers came out on top. The people who learned these new Hungarian words by singing them showed a higher overall performance. They did the best in four out of five of the tests. They also performed two times better than those who simply learned the words by speaking them.

    Dr. Katie Overy says singing could lead to new ways to learn a foreign language. The brain likes to remember things when they are contained in a catchy or memorable tune.

    Dr. Ludke said the findings could help those who struggle to learn foreign languages. On the University of Edinburgh's website Dr. Ludke writes, “This study provides the first experimental evidence that a listen-and-repeat singing method can support foreign language learning, and opens the door for future research in this area.”

    The brain is a remarkable part. It's responsible for thoughts and feelings. Now a new study finds that going through tough times as a kid also can have an impact. The adult brains of people who lived through lots of stress before the age of six—and then became depressed or anxious as teenagers—were different compared with adults who had an easier childhood. It seems that teens changed the shape of their brains by internalizing (使内在化) the stresses experienced years earlier.

    Researchers already knew that the shape and size of a child's brain can change in response to lots of stress. They also knew that adults were more likely to be depressed if, as kids, they'd lived in poverty. Some studies showed that these depressed adults had unusual changes in their brain shape. But no one had tested if the early stress and later brain changes were linked.

    Scientists in England studied almost 500 boys from birth until the ages of 18 to 21. Sarah Jensen is one of the new study's authors. Almost all of the boys her team studied experienced some hard times as kids. And, she concludes, "This is not necessarily harmful." To some extent, that's just life. What can be dangerous, she says, is when children experience too many forms of difficulties. Her team's new data suggest that the tougher the childhood, the stronger the impact on the brain might be.

    What's happening in the world around us relates to how we feel. Her team linked more childhood stress to more depression. Still, she notes, it's possible that if you find support for anxiety or depression, you might be able to prevent the changes seen here. "If you can change the environment, you can change the course of things," Sarah says. So, she recommends, if teens develop anxiety or depression, it's good to ask for psychological doctors to give advice.

    Along the river banks of the Amazon and the Orinoco there lives a bird that swims before it can fly, flies like a fat chicken, eats green leaves, has the stomach of a cow and has claw s ( 爪) on its wings when young. They build their homes about 4.6m above the river, an important feature for the safety of the young. It is called the hoatzin.

    In appearance, the birds of both sexes look very much alike with brown on the back and cream and red on the underside. The head is small, with a large set of feathers on the top, bright red eyes, and blue skin. Its nearest relatives are the common birds, cuckoos. Its most striking feature, though, is only found in the young.

    Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip. Using these four claws, together with the beak (喙), they can climb about in the bushes, looking very much like primitive (远古的) birds must have done. When the young hoatzins have learned to fly, they lose their claws.

    During the drier months between December and March hoatzins fly about the forest in groups of 20 to 30 birds, but in April, when the rainy season begins, they collect together in smaller living units of two to seven birds for producing purposes.

Start of Summer, the 7th term of the year, begins on May 6 and ends on May 20 this year. It signals the transition of seasons. Here are four things to learn about it.

Greeting Start ofSummer

The term Start of Summer originated at the end of the Warring States Period. Since it is a crucial time for the harvest of summer crops, ancient Chinese emperors in different dynasties attached great importance to the Start of Summer.

CheckingOne'sWeight

The custom of weighing people at the Start of Summer originated from the Three Kingdoms Period and prevails in South China today. It was believed this practice would bring health and good luck to the people weighed. It is said those who were weighed would stay healthy in the hot summer and those who weren't would suffer illness.

EatingEggs

In ancient China, people believed a round egg symbolized a happy life and eating eggs on the day of Start of Summer was a prayer for good health. They put leftover tea into boiled water together with eggs. Later people improved cooking methods and added spices to the eggs to make them taste delicious. Today tea egg has become a traditional snack in China.

Taking Care of theHeart

According to Chinese traditional medicine, Start of Summer is a key time to moisten the heart. When the weather grows hotter, dampness and heat can affect human health. Food rich in vitamins and cool in nature is highly recommended. Vegetables, such as cucumber, tomato, and watercress and fruits like watermelon, pear and strawberry are top recommendations.