Facebook is an Internet-based social network site that lets people get in touch with family and friends and reach out to people with common interests around the world, all through computer. It is very popular, with more than 900 million users. If Facebook were a country, it would have about three times the population of the United States.

    Documents filed with US. financial regulators say Facebook has hundreds of millions of active users who send billions of messages each day and upload 250 million photographs on their personal pages. Facebook users have registered 100 billion “friends.”

    On Facebook, “Friending” someone means you add the person to your list of people you can communicate with directly, which often allows the person to see more information about you than you share with the general public.

    Facebook was started by Mark Zuckerberg and other students at Harvard University in 2004, and has grown at an amazingly fast pace.

    Facebook makes money when advertisers pay to get access to hundreds of millions of Facebook users. Advertisers can often direct their messages to the people most interested in their products because Facebook computers keep track of information that users place on their pages. For example, a person interested in diving, planning a wedding, looking for work, or suffering from diabetes(糖尿病) may see advertisements related to those topics.

    Facebook has become so much a part of the culture of the United States and other nations that it has been the subject of a Hollywood movie. It is a key marketing tool for many businesses, and its users' content has been used as evidence in some divorce or criminal cases.

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    Traditional Chinese medicine (TCM) is gaining global popularity. According to a government white paper, TCM has been introduced in 183 countries and regions around the world.

    Westerners' understanding of TCM, however, may be limited to acupuncture, cupping and massage(针灸，拔罐和按摩). For instance, the purple, injury-like marks left on U. S. swimmer Michael Phelps，back from cupping for the purpose of relaxing his muscles and reducing pain became the center of attention during the Rio Olympics in 2016.

    As a matter of fact, Chinese herbs play a more important role in getting rid of diseases and keeping the body in good condition in the TCM treatment system than physical treatment. It is therefore disheartening to know that while 103 World Health Organization member countries have given approval to the practice of acupuncture, not many recognize Chinese herbal medicine. TCM falls far behind Western medicine owing partly to the slow development of Chinese herbs.

    Herbs are made into pills, powder and soup, and the kind of herbs used, their quality and quantity, and the processing of the ingredients (原材料) jointly determine the effectiveness of the prescription. Compared with Western medicine, which has standardized drug production processes and treatment methods, TCM lacks standardization, with the chemical composition and functions of its medicines being unclear and their effects being unstable. Fortunately, standardization has improved in recent decades, with an increasing number of factories producing patented TCM drugs.

    Another factor that has prevented the development of TCM prescription drugs is the lack of creativity. While Western medicine-making companies come up with new products every year, TCM drug producers tend to make medicines according to prescriptions handed down from the past. Chinese chemist Tu Youyou's winning the 2015 Nobel Prize in Physiology or Medicine for her research into malaria (疟疾) treatment may drive creativity to some extent in China's TCM industry. However, the current state of affairs cannot be changed within a short time.

    The pub is a great British invention. Here, experts pick their favourites for Sunday lunch, picturesque settings, craft beer, history and more.

    Free Trade Inn, Newcastle

    House favourites

    Fyne Ales Jarl, 3.8%

    Scream for Pizza food truck, every Wednesday, £5 (if pre-booked)

    Moors and oceans are great, but looking up the Tyne towards the city's bowed bridges from this pub in Ouseburn is another kind of delight. It is especially exciting at sunset, as the Instagrammers and amateur photographers of north-east England have discovered — city lights gleaming(闪烁) against Miami Vice skies.

    The Angel on the Bridge, Henley-on-Thames

    House favourites

    Brakspear Bitter, 3.4%

    Slow-roast belly pork, £13.50

    For those who prefer their views more landscaped than wild. The river is peaceful, the ducks entertaining, the air clean, and sunsets and mist keep the view varied all year round. The pub even has its own moorings for people with boats.

    Duke of Marlborough, Suffolk

    House favourites

    Adnams Dry Hopped Lager, 4.2%

    Braised beef cheek, £13.50

    Time has a habit of leaving its trace on village pubs and the Duke is no different. Originally built as a medieval hall house, it became an inn during the 17th century. With the help of what is obviously a very active community, the pub is a lively place attracting drinkers, foodies and families with kids. Help yourself to dog biscuits if you bring your best friend.

    The Bevy, Brighton

    House favourites

    Harvey's Sussex Best Bitter, 4%

    Sunday roast, £7.95

    In 2010, what was then the Bevendean pub was closed by the police due to a series of antisocial incidents. Four years later it reopened as the Bevy, after locals bought it and carried out essential works. The whole project is an example of how an urban pub in an unfashionable area can be saved.

    History is full of tales of great ideas taking shape in sleeping minds; Paul McCartney said that he awoke with the tune of Yesterday in his head, and Robert Louis Stevenson said that the idea for The Strange Case of Dr Jekyll and Mr Hyde came to him in a dream.

    Scientists believe that the mind at night puts together bits of information in creative ways. Throughout the day your brain rarely gets a chance to stop and think. It constantly responds to a stream of challenges, from writing a report for a work deadline to remembering where you left your car keys and figuring out what to buy for dinner.

    "Think of your brain like a web," says Russell Foster, Professor of Neuroscience at Oxford University. "During the day the web is very tight, so you can only put information in a certain number of places. During sleep the web expands, and with the luxury of time, those bits of information can be put into lots of different places and make new associations."

    He adds that this process may help to foster the formation of new ideas. "This bringing together of seemingly unrelated bits of information is vital to helping the brain think itself out of problems," says Russell Foster.

    "Sleep seems to allow your mind to make non-obvious connections. It puts all the information from the day into a big biological theatre and forces the mind to speak to people at the back of the theatre, who you may not think you have any connection with. This is the basis of creativity connecting ideas, events and memories that wouldn't normally fit together.

    By placing volunteers into brain scanners and sending them to sleep, scientists have seen that the areas associated with emotion go into overdrive, especially while dreaming, while the areas that are responsible for logic (逻辑)are switched off. This not only explains why dreams are unbelievably random-you can be talking to a colleague one minute and the next minute sitting in your old school classroom dressed in your nightclothes­but also explains how the brain can put together different information.

    One spring day, once the flowers have begun to open, a bee will hover (盘旋) and zip through your yard and dive-bomb your picnic table. While you're thinking about avoiding an attack, that bee is focused on something else entirely: me.

    A honeybee has about six weeks to live. Today, like most days, her task is to fly as many as three miles from home, stick her long, straw-like tongue into a hundred or so flowers. When the bee has had her fill, she'll fly home. There the bee will deposit what she has got into the mouth of one of her co-workers, who will relay it to another, and so on for about 20 minutes, until the mixture is ready to be placed into the comb. Then she and her 50,000 or so mates will hover in the dark all night every night, flapping their wings to create hot, breezy conditions to remove the water from the mixture. Several sunrises later, they will seal me off in a golden cell of beeswax. In her lifetime, our bee may visit 4,000 flowers, and yet will produce only one-twelfth of a tea spoon of me.

    The average American consumes nearly a pound and a half of me every year, in tea, on toast, and beyond. If I do say so myself, I am a timeless treasure. Literally--I never go bad.

    Unfortunately, my good health is not guaranteed. The problem lies in the growth of industrial agriculture and the use of pest control chemicals, as well as changes in weather patterns, all of which reduce the number of flowers bees have to visit. I'd appreciate your letting your own garden grow just a little wild. My future depends on all of us fostering spring and summers wild flowers, thus helping the bees, who give so much--to you, to me--without ever asking for anything in return.