Here is an astonishing and significant fact: Mental work alone can't make us tired. It sounds absurd. But a few years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue(疲劳). To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day laborer, we could find it full of fatigue toxins(霉素) and fatigue products. But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.

    So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours of efforts as at the beginning. The brain is totally tireless. So what makes us tired?

    Some scientists declare that most of our fatigue comes from our mental and emotional(情感的) attitudes. One of England's most outstanding scientists, J. A. Hadfield, says, “The greater part of the fatigue from which we suffer is of mental origin. In fact, fatigue of purely physical origin is rare.” Dr. Brill, a famous American scientist, goes even further. He declares, “One hundred percent of the fatigue of a sitting worker in good health is due to emotional problems.”

    What kinds of emotions make sitting workers tired? Joy? Satisfaction? No! A feeling of being bored, anger, anxiety, tenseness, worry, a feeling of not being appreciated—those are the emotions that tire sitting workers. Hard work by itself seldom causes fatigue. We get tired because our emotions produce nervousness in the body.

    Big Messaging Apps Abroad

    While WeChat is China's biggest mobile messaging app, there are many similar apps in other countries that offer similar features.

    WhatsApp (US)

    Users: more than 300 million

    Platforms: Android, iOS, Windows Phone, BlackBerry

    Features: Text chat, push-to-talk, file sharing, location sharing

    With more than 300 million active users, WhatsApp is one of We Chat's biggest competitors.

    Developed by two ex-Yahoo employees in 2009, WhatsApp originally focused on text chat, but on Aug. 6 it also started push - to - talk service. It's noted for its accessibility, ease of use and the absence of advertisements. The service is free for the first year, after which $ 0.99 (6. 06 yuan) is charged for a one –year subscription.

    Kakao Talk (South Korea)

    Users: more than 100 million

    Platform: Android, iOS, windows Phone, BlackBerry and Bada (an operate system developed by Samsung)

    Features: Text chat, group chat, push–to–talk, group calls, file sharing

    With more than 100 million users in more than 230 countries, Kakao Talk is a multi - platform (多平台) texting application that allows users to send and receive messages for tree. With Kakao Talk, users can message each other one-on-one or in group chats with unlimited numbers of friends. You can also choose from more than 250 animated emoticons and share them with friends.

    Line (Japan)

    Users: more than 200 million

    Platforms: Android, iOS, Windows Phone, BlackBerry and PC

    Features: Text chat, group chat, push–to–talk, file sharing, location sharing, gaming, stickers

    Line tops the list of the most downloaded free apps in 52 countries. Apart from text and voice messaging, Line provides its users with more than 250 original stickers and emoticons to buy from its own shop. In the first quarter of 2013 alone, it made $ 17 million just from stickers. The popular app also allows friends to battle each other in the Line games.

    US scientists say they have poured cold water on the theory that washing hands with hot water kills more germs (细菌) than unheated water. The small study of 20 people found using water at 15C (59F) left hands as clean as water heated to 38C (100F).

    National Health Service (NHS) recommends that people wash their hands in either cold or warm water. In this study, scientists at Rutgers University-New Brunswick wanted to find out if popular assumptions about the benefits of warm or hot water and official guidance on hot water —given to the food industry in the US - held true. They asked 20 people to wash their hands 20 times each with water that was 15C (59F), 26C (79F) or 38 degrees (100F). Volunteers were also asked to experiment with varying amounts of soap. Before they started the tests, their hands were covered in harmless bugs. Researchers say there was no difference in the amount of bugs removed as the temperature of the water or the amount of soap changed.

    Prof Donald Schaffner said: “People need to feel comfortable when they are washing their hands but as far as effectiveness goes, this study shows us that the temperature of the water used did not matter.”

    However, the researchers accept their study is small and say more extensive work is needed to determine the best ways to remove harmful bacteria.

    In the UK, NHS experts say people can use cold or hot water to wash their hands. They say hands should be washed for at least 20 seconds and stress the importance of using enough soap to cover the whole surface of the hands. Their guidance focuses on rubbing hands together in various .ways to make sure each surface of each hand is clean.

    What happens inside the head of a soccer player who repeatedly heads a soccer ball. That question motivated a study of the brains of experienced players.

    Researchers at the Albert Einstein College of Medicine in New York selected 34 adults, men and women. All of the volunteers had played soccer since childhood and  now competed year﹣round in adult soccer leagues. Each filled out a detailed questionnaire developed especially for this study to determine how many times they had headed a soccer ball in the previous year, as well as whether they had experienced any known concussions in the past.

    Then the players completed computerized tests of their memory and other learning skills and had their brains scanned. using a complex new M.R.I. technique which can find structural changes in the brain that can't be seen during most scans.

    According to the data they presented, the researchers found that the  players who had headed the ball more than about 1, 100 times in the previous 12 months showed significant loss of white matter in parts of their brains involved with memory, attention and the processing of visual information, compared with players who had headed the ball less.

    This pattern of white matter loss is "similar to those seen in traumatic brain injury", like that after a serious concussion, the researchers reported, even though only one of these players was reported to have ever experienced a concussion.

    The players who had headed the ball about 1, 100 times or more in the past year were also generally worse at remembering lists of words read to them, forgetting the words far more often than players who had headed the ball less.

    Poetry is the artistic expression of the human thoughts and feelings in rhythmical and emotional language. Compared with prose (散文) , it lays more stress on rhythm, imagery (意象), emotion, and imagination. As its language is rhythmical, its sound is highly musical. We may say, "No rhythm, no poetry", no matter the rhythm of poetry is traditional as in metrical (格律的) style or "natural" as in free verse.

    So the poet must write carefully and reflectively in order to find words that not only fulfills the demands of meter and rhyme, but also expresses the meaning in a manner that complements the imagery and tone of the rest of the poem. This careful use of language is the most significant difference between ordinary prose and poetry.

    The ordinary prose writer neatly builds an argument using words the way a mason (石匠) builds a house using bricks; the poet is an artisan who creates a fieldstone hearth (大卵石壁炉炉床) — each stone or each word is turned over  examined, and often laid aside until it can be placed where its shape, weight, and color will contribute to the strength and beauty of the whole. Prose, according to Samuel Taylor Coleridge, is "words in their best order", and poetry is "the best words in their best order".

    The reader's chief delight in reading poetry comes from his response to its musical effect, which comes from many metrical patterns represented in conventional iambic (抑扬格) feet or from repetitions and parallel phrasing shown in free verse and from other elements of poetry.

    Angel Garcia Crespo is a computer engineer at Carlos III University of Madrid in Spain. His group has invented a new way for deaf-blind people to “watch” TV. The idea for the technology grew out of previous work by his group. The team had already worked on making audiovisual(视听的) materials accessible to people with either vision or hearing disabilities. But the group wanted to help people with both challenges. So they asked some deaf-blind people what would help.

    In addition to relying on their sense of touch to communicate, deaf-blind people can also get and send information with a Braille line. The Braille system uses patterns of raised dots to stand for letters and numbers. A Braille line is an electronic machine with a changeable Braille display. Dots rise up or drop down based on the information sent to the machine.

    Now the new system changes TV signals to data a Braille line can use. “The key to the system is the possibility of using subtitles(字幕) to collect TV information, " Garcia Crespo explains. "Subtitles travel with the image(影像) and the audio in electromagnetic waves we don't see. But an electronic system can keep those waves."

    First, a computer program, or app, pulls out the subtitles and visual descriptions from the broadcast signal. The system then combines the information and changes both into data for Braille.

    Now another app gets to work, which sends the data out to people's Braille lines on demand. “This is done in real time, in less than a second, " Garcia Crespo says. This lets a deaf-blind person "watch" TV as it's broadcast. The system will work with various Braille lines, as long as there's a bluetooth connection available. Now, the system is only used in Europe, and it should soon be available in the US.