Nowadays wind is useful. Think about the different ways that people use the wind. You can use it to fly a kite or to sail a boat. Wind is one of our cleanest and richest power sources, as well as one of the oldest. Evidence shows that windmills began to be used in ancient Iran back in the seventh century BC. They were first introduced to Europe during the 1100s, when armies returned from the Middle East with knowledge of using wind power.

    For many centuries, people used windmills to grind wheat into flour or pump water from deep underground. When electricity was discovered in the late 1800s, people living in remote areas began to use them to produce electricity. This allowed them to have electric lights and radio. However, by the 1940s, when electricity was available to people in almost all areas of the United States, windmills were rarely used.

    During the 1970s, people started becoming concerned about the pollution that is created when coal and gas are burned to produce electricity. People also realized that the supply of coal and gas would not last forever. Then, wind was rediscovered, though it means higher costs. Today, there is a global movement to supply more and more of our electricity through the use of wind.

    Shyness May Be Partly Inherited(遗传)

    About 92 million Americans are shy, and according to recent research about half of them inherited the trait.

    The studies were discussed at the American Psychological Convention.

    One study, by Harvard University, was of babies 21- 48 months old. It concluded that these babies had a high heart rate when shown unfamiliar people or different toys.

    Although shyness is not new, it has only recently become of interest to researchers. The first study on the genetic connection was in 1979.

    According to Warren Jones of the University of Tulsa, social relations these days are more complex. "With less ritual(仪式) and more complex situations," he said, "shyness is a national concern."

    Not all shy people are anxious and fearful, according to another study. Evidence shows that only half of shy people are tense, worried, and fearful in social situations.

    Many men use shyness as an excuse for failing in social situations, according to C.R. Snyder of the University of Kansas. "This is not true of females. Perhaps,

    American men are pressured to be assertive(自信的) and successful. So they would rather say they're shy than admit they're incompetent."

    Shy people may do very well socially after the first meeting with someone. In fact, shy people tend to be more stable.

    The psychologists said shyness seems to be cultural. Japan has the highest rating. China and Israel have the lowest rating. The United States rated in the middle.

    It seems that you can hardly go to any bookstore without encountering Charles Dickens. From Oliver Twist to A Tale of Two Cites, Dickens' works still enjoy great popularity today and are placed on notable shelves.

    As someone who teaches Dickens, the question of why we still read him is often on my min. Nearly 10 years ago, I told my students that Dickens, works started crazes in Victorian readers. Then a hand shot up in the middle of the room. “But why should we still read his stuff?” A student asked. I was speechless because I had never considered the question myself. The answer I gave was only acceptable. “Because he teaches you how to think,” I said.

    The question annoyed me for years, and for years I told myself answers, but never with complete satisfaction. We read Dickens because he not only was a man of his own times, but also is a man for our times. We read Dickens because his exploration of the human mind is deep. We read Dickens because we can learn from the experiences of his characters. These are all wonderful reasons, but not exactly the reasons why I read Dickens.

    My search for an answer continued in vain, until one day a text message came from a student of mine. “We still read Dickens' novels,” she wrote, “because they tell us why we are what we are.” Simple as it was, that was the explanation I had thought for years.

    Like most people, I think I knew who I was without knowing it. I was Oliver Twist, always wanting and asking for more. I was Nicholas Nickleby, convinced that my father was watching me from beyond the grave. I was Pip, in love with someone far beyond my reach. I was all of these characters, and I began to understand more about why I was who I was because Dickens had told me so much about human beings. Dickens shines a light on who we are during the best and worst of times. That's why we still need to read him today.

    Social media is one of the fastest-growing industries in today's world. Your friends' lives may look more exciting than yours on Facebook, Twitter, and Instagram, but a new research shows it is because they are faking (伪造) it.

    A recent survey has found around two-thirds of people on social media post images to their personal information to make their lives seem more adventurous. And more than three quarters of those asked said they judged their peers based on what they saw on their Instagrm, Snapehat or Facebook pages.

    The British survey, by smart phone maker HTC, found that, in order to make our own pages and lives appear more exciting, six percent also said they had borrowed items to include in the images in order to pass them off as their own. More than half of those surveyed said they posted images of items and places purely to show off, causing jealousy among friends and family.

    Behavioral psychologist Hemmings said the trend was unsurprising due to the rise of social media. "We're living in a world instant communication." she said. "Fashion and style used to live and die in magazines; now people are in search of authentic, peer-to-peer recommendations as well, making social media an equal power house to magazines and newspaper."

    "With images being shared in an instant, we desire to know what our friends are wearing, or what super stars are buying, as soon as they have got them." Such is the influence of social media sites like Instagram, 76 percent of those asked also said seeing items on social influences them to buy them, with men more likely to take style advice and buy what they see.

    That little "a" with a circle around it that is found in e-mail addresses is most commonly referred to as the "at" symbol. Surprisingly though, there is no official, universal name for this sign. There are lots of strange terms to describe the @ symbol.

Before it became the fixed symbol for e-mail, the symbol was mostly used to represent the cost or weight of something. For instance, if you bought 6 apples, you might write it as 6 apples @ $1.11 each.

    With the introduction of e-mail came the popularity of the @ symbol. The @ symbol separates a person's online user name from his mail server address, for instance joe@uselessknowledge.com. Its widespread use on the Internet made it necessary to put this symbol on keyboards in countries that had never seen or used the symbol before. As a result, there is really no official name for this symbol.

    The actual origin of the @ symbol remains unknown. History tells us that the @ symbol came from the tired hands of the monks(僧侣) in the Middle Ages. During the Middle Ages when there were no printing presses, every letter of a word had to be copied by hand for each copy of a published book. The monks that performed these long and boring copying duties looked for ways to reduce the number of strokes (笔划) per word for common words.

    Although the word "at" is quite short, it was such a common word in texts and documents that monks in the Middle Ages thought it would be good idea to shorten the word "at" even more. As a result, the monks left out the "t" and created a circle — getting rid of two strokes.

Powerisers

    The ability to jump two meters in the air may not be something you have thought too much about. And most people have never considered running at 30 kilometers an hour. But just stop for a moment and think about how our new product could change your life.

    Your daily journey to your place of work is probably a mad dash for the bus. There is no point in taking your car because there are traffic jams, and anyway the car parks are probably very expensive or, worse still, full. Here is where Powerisers can help. It takes just a couple of minutes to put them on and then you are away, going past others or even jumping over the object which blocks your way.

    That is the practical use for our product, but then there is sport and exercise. Powerisers are set to be the next extreme sport and the deep-fit tools. You can imagine the 100 meters, the high jump or basketball performed by athletes wearing Powerisers. And what better way to build your muscles and keep fit?

    Our product is very simple. It is powered by a superlight spring, which uses the gravitational(重力的) pull from your body weight and pushes you with superhuman strength. There have been no records of serious injury related to the use of Powerisers, but extreme caution is recommended. We strongly advise the wearing of protective clothing, including at least a helmet(头盔).

    Powerisers make you feel as if you were walking on the moon. Now we make two different models: Basic and Professional. The Basic model is designed for the occasional users and costs around $ 500. The Professional model, which is designed for the competitive use, has a strongly-made structure and different springs, though that comes at the increased price of $800. Our Powerisers are guaranteed for two years and will be replaced without question if they fail during that period. That is how confident we are.