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(风车) began to be used in ancient Iran back in the 7th 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(磨碎) wheat into flour or pump water from deep underground. When electricity was discovered in the late 1800s, people living in remote(偏远的) 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(可利用的) to people in almost all areas of the United States, windmills were seldom 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.

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    Self-driving vehicles will rely on cameras, sensors and artificial intelligence（AI）to recognize and respond to road and traffic conditions, but sensing is the most effective for objects and movement in the neighborhood of the vehicle. Not everything important in a car's environment will be caught by the vehicle's camera. Another vehicle approaching at high speed on a collision （碰撞）track might not be visible until it's too late. This is why vehicle-to-vehicle communication is undergoing rapid development. Our research shows that cars will need to be able to chat and cooperate on the road, although the technical challenges are considerable.

    Applications for vehicle-to-vehicle communication range from vehicles driving together in a row, to safety messages about nearby emergency vehicles. Vehicles could alert each other to avoid collisions or share notices about passers-by and bicycles.

    From as far as several hundred metres away, vehicles could exchange messages with one another or receive information from roadside units（RSUs）about nearby incidents or dangerous road conditions through 4G network A high level of A1 seems required for such vehicles, not only to self-drive from A to B, but also to react intelligently to messages received. Vehicles will need to plan, reason, strategize and adapt in the light of information received in real time and to carry out cooperative behaviours. For example, a group of autonomous vehicles might avoid a route together because of potential risks, or a vehicle could decide to drop someone off earlier due to messages received, a foreseen crowding ahead.

    Further applications of vehicle-to-vehicle communication are still being researched, including how to perform cooperative behaviour.

A Blessed Teacher

    I remembered Ricky came back to see me ten years after he was in my class. He told me how I had inadvertently(不经意地) changed his life.

    Ricky often gazed out the window during one of my ninth-grade history classes early in my teaching career. He was quiet, and his good grades and mild manner were why I did not move him away from the seat by the window.

    One day, I leaned over his shoulder and quietly asked, “What are you looking at? You gaze out of this window during every class.”

    He said, “I am looking at the band.”

    According to Ricky, I said, “If you like the band so much that you have to look at them during this class every day, I want you to go down to Mr. Overby (the band teacher) and tell him that I sent you. Tell him that you want to be in the band. Now turn around and finish working before the bell rings.”

    The next day Ricky went to Mr. Overby and told him I had sent him and he wanted to be in the band. He added that he did not know how to play any instrument.

    When Ricky visited me ten years later, he thanked me for telling him to go to Mr. Over by because he fell in love with music and discovered his musical talent that had not been tapped. His musical talent resulted in him getting a scholarship to college and earning a degree that now allowed him to provide for his family. Most of all, music had brought great pleasure and satisfaction to his life.

    After Ricky thanked me, I pointed out that he did all of the hard work it took to become the wonderfully talented person that he was. I did not make him walk downstairs to join the band, practice his instrument, and get the good grades that led to his college scholarship.

    Ricky responded that I could have yelled at him for looking out the window. Instead, I gave him an alternative that changed his whole life.

    After he left, I thought about his words. I realized that I was teaching children with every word I said, every action I took, and with every decision I made. Ricky's story raised my teaching bar. Most of all, I have never forgotten the lesson Ricky taught me, a blessed teacher.

    Have you ever wondered what the longest word in the English language is? Believe it or not, there's no simple answer to the question. You might think it would be as easy as opening a dictionary and looking for the longest word. However, it's far more complicated (复杂的) than that.

    Over time, many people have suggested many different words for the title of the longest word in English. How can that be? That's because the first thing that people have different opinions on is what should be considered a word. Some of the words were simply made up to be the longest! For example, there is one really famous long word that most kids know. It comes from Disney's movie Mary Poppins: supercalifragilisticexpialidocious, which means wonderful. But since that 34-letter word was made up simply to be sung as a song in a movie, should it count?

    How about long words that actually describe something in the world? Scientists have come up with several possible choices. The name of a virus(病毒) totals 1,185 letters. There's also a protein(蛋白质) whose name totals 1, 909 letters. Should these win the title? "Not so fast!" say some people. Are these words ever actually used? Can they even be pronounced? And are they meaningful just because they are made up to be long?

    If you're wondering about some long words in common English, here are some examples. Those words include uncharacteristically (20 letters), deinstitutionalization(22 letters) and counterrevolutionaries (also 22 letters) Or perhaps the word "smiles" is the longest word in English. Sure, it has only six letters, but there is a "mile between the first and the last letters!

    What exactly is intelligence? There aren't any easy answers. Despite the progress that has been made in genetics and psychology, human intelligence has remained one of the most controversial areas of modern science, until now, that is, for the discovery of a gene(基因) linked to intelligence has made the experts think again.

    Robert Plomin of the Institute of Psychiatry in London and his colleagues in the US have been looking into genetic make-up. From their research, they have discovered that a slightly different gene is more common in those with a high IQ. Plomin analyzed DNA from two groups of 51 children aged between 6 and 15. What he found was that the first group had an IQ of 136, putting them in the top 5% of the population, while the other group had an average IQ of 103. An analysis of their genes showed that 32% of children in the higher group had the gene in question, while only 16% in the second group did. However, there is a lot more research to be done, and Plomin himself is cautious at this early stage. He suggests that there are probably many genes that contribute to intelligence, rather than just one.

    Several studies have shown a strong link between IQ and career success, although some psychologists remain unconvinced about this. Professor Michael Rowe, who has written a book called Genius Explained, is one of these. "The people with the highest IQs are not usually the ones who do best in their careers."

    Many psychologists now believe that when it comes to intelligence, IQ isn't everything. Many alternative views have been put forward recently. One example is the idea of multiple intelligences, which was developed in the 1980s by Harvard psychologist Howard Gardner. This offers a much broader view than the IQ theory, including creativity and communication skills as relevant factors(因素) in intelligence.

    Tony Buzan, brain expert and author of Master your Memory, is enthusiastic about this belief, arguing that true geniuses(天才) do indeed appear to combine high levels of each type of intelligence. He lists Alexander the Great, Pablo Picasso and Albert Einstein as examples. At the same time, Buzan believes that everyone can develop their intelligence, only if they take the trouble to exercise their brain. Perhaps there's hope for us all!

    There's a new frontier in 3D printing that's beginning to come into focus: food. Recent development has made possible machines that print, cook, and serve foods on a mass scale. And the industry isn't stopping there.

    Food production

    With a 3D printer, a cook can print complicated chocolate sculptures and beautiful pieces for decoration on a wedding cake. Not everybody can do that — it takes years of experience, but a printer makes it easy. A restaurant in Spain uses a Foodini to "re-create forms and pieces" of food that are "exactly the same," freeing cooks to complete other tasks. In another restaurant, all of the dishes and desserts it serves are 3D-printed, rather than farm to table.

    Sustainability(可持续性)

    The global population is expected to grow to 9.6 billion by 2050, and some analysts estimate that food production will need to be raised by 50 percent to maintain current levels. Sustainability is becoming a necessity. 3D food printing could probably contribute to the solution. Some experts believe printers could use hydrocolloids (水解胶体) from plentiful renewables like algae(藻类) and grass to replace the familiar ingredients(烹饪原料). 3D printing can reduce fuel use and emissions. Grocery stores of the future might stock "food" that lasts years on end, freeing up shelf space and reducing transportation and storage requirements.

    Nutrition

    Future 3D food printers could make processed food healthier. Hod Lipson, a professor at Columbia University, said, "Food printing could allow consumers to print food with customized nutritional content, like vitamins. So instead of eating a piece of yesterday's bread from the supermarket, you'd eat something baked just for you on demand."

    Challenges

    Despite recent advancements in 3D food printing, the industry has many challenges to overcome. Currently, most ingredients must be changed to a paste(糊状物) before a printer can use them, and the printing process is quite time-consuming, because ingredients interact with each other in very complex ways. On top of that, most of the 3D food printers now are restricted to dry ingredients, because meat and milk products may easily go bad. Some experts are skeptical about 3D food printers, believing they are better suited for fast food restaurants than homes and high-end restaurants.