Robots make me nervous—especially the ones which seem to think for themselves. I was embarrassed to admit this till I heard that Bill Gates, the founder of Microsoft, felt the same way.

    Gates said in an interview with the social networking and news website Reddit: "I am in the camp that is concerned about super intelligence. First the machines will do a lot of jobs for us and not be super intelligent．That should be positive if we manage well. A few decades after that, though, the intelligence is strong enough to be a concern."

    Well, maybe I don't have to worry about my computer and kitchen equipment yet. After I use them I can always pull the plug. But in the future, machines might find a way to prevent us from switching them off. There's a terrible thought!

    Maybe the problem with computers too clever for us is not that they are evil like some we've seen in sci-fi movies. What could put us in danger is that they might be too efficient. That's what philosopher Nick Bostrom from Oxford University believes. He says that machines are indifferent to humans and in pursuit of their own goals，the destruction of people might be just additional damage. Bostrom gives us an example: A machine which might have its only goal to produce as many paperclips as possible might look at human bodies as extra material for paperclips and go after you. Because it is, well, a machine, it would not take pity on you.

    It's a good thing that American writer Isaac Asimov thought about how far robots can go and left us his three rules of robotics. They state that a robot may not hurt a human being or allow the human being to come to harm.

    I'm glad my machines at home are "dumb". All my cleaner wants to take over is the carpet in my living room. Let's hope they don't create an appliance which wants to take over the world!

    Cao Yuan, a PhD student from China, had two papers published on strange behaviour in atom-thick layers of carbon that have opened up a new field of physics.

    Pablo Jarillo-Herrero's group at MIT was already layering and rotating (旋转) sheets of carbon at different angles when Cao joined the lab in 2014. Cao's job was to find out what happened when one graphene (石墨烯) sheet was twisted only slightly wiht respect to the other, which one theory predicted would thoroughly change the material's behaviour.

    Many physicists doubted the idea. But when Cao set out to create the subtly twisted stacks, he spotted something strange. Exposed to a small electric field and cooled to 1.7 degrees above absolute zero, the graphene—which ordinarily conducts electricity—became an insulator. That by itself was surprising. But the best was yet to come: with a slight change to the field, the twisted sheets became a superconductor, in which electricity flowed without resistance.

    The ability to get atom-thick carbon into a complex electronic state through a simple rotation now has physics demanding to engineer exciting behavior in other twisted 2D materials. Some even hope that graphene could shed light on how more-complex materials superconduct at much higher temperatures. "There are so many things we can do," says Cory Dean, a physicist at Columbia University. "The opportunities at hand now are almost irresistible."

    Hitting graphene's “magic angle”—a rotation between parallel sheets of around 1.1°—involved some trial and error, but Cao was soon able to do it reliably. His experimental skill was extremely important, says his supervisor Jarillo-Herrero. Cao pioneered a method of tearing a single sheet of graphene so that he could create a stack of two layers, from which he could then fine-tune alignment (微调校准).

    Cao loves to take things apart and rebuild them. A heart, he is “a tinkerer”, his supervisor says. On his own time, this means photographing the night sky using homemade cameras and telescopes—pieces of which usually lie across Cao's office. "Every ime I go in, it's a huge mess, with computers taken apart and pieces of telescope all over his desk," says Jarillo-Herrero.

    Since 2013,Torobo, a robotic are designed to test the limits of artificial intelligence, has had one ambition—to be admitted to the University of Tokyo, one of Asia's top-ranked educational institutions. Although equipped with an extensive database of textbooks and other teaching materials, Torobo has repeatedly failed to obtain the university's required minimum 80% score in the National Center Test, a yearly standardized entrance examination adopted by Japanese universities. This year was no exception.

    In early November, Torobo, along with millions of Japanese high school students, took a mock(模拟的)exam to prepare for the all-important standardized test.

    Torobo's total score of 525 out of 950, which was higher than the national average, was enough for it to get admitted to many other influential Japanese universities.

    However, its standard score of 57.1%, though 14 points higher than in 2015, still fell short of the minimum required for the University of Tokyo.

    A closer analysis of the results showed that Torobo was able to draw from its database to solve knowledge-based questions and ones involving complex mathematical calculations, but it had a hard time thinking independently, failing to comprehend multiple sentences and phrases to arrive at the logical conclusions. This weakness was reflected in its shabby English scores.

    Fortunately, the robot's creators have decided to free Torobo from its four-year sufferings. Noriko Arai, professor of the University of Tokyo who heads the team, says, “From the present results, we are able to evaluate the possibilities and limits of artificial intelligence. From now on, we will grow its abilities in the fields where it is doing well and aim to improve them to levels that can be applied in industry.” So while Torobo will never graduate from the University of Tokyo, it can still look forward to a bright future!

    A disastrous fire surrounded Notre Dame(巴黎圣母院)completely and destroyed large parts of the Gothic(哥特式的) architecture on Monday.

    "Notre Dame is our history, our literature; part of our spirit, the place of all our great events, our wars, our liberations, the center of our lives" French President Emmanuel Macron told reporters in front of the still burning Paris landmark and promised to rebuild Notre Dame Cathedral.

    "Notre Dame is burning, and know the sadness and this tremble felt by so many fellow French people. But tonight, I'd like to speak of hope too, "he said, announcing the launch of a fundraising campaign.

    "Let's be proud, because we built this cathedral more than 800 years ago, we've built it and, throughout the centuries, let it grow and improve it. So I gravely say tonight: we will rebuild it together, "he added.

    The disastrous fire engulfed(吞没) the upper reaches of Paris' towering Notre Dame Cathedral as it was undergoing renovations(翻新).

    Tourists and Parisians looked on horrified from the streets below. France's Interior Ministry said firefighters might not be able to save the structure.

    The fire collapsed the cathedrals' spire(尖顶) and spread to one of its landmark towers "Everything is burning; nothing will remain from the frame, "Notre Dame spokesman Andre Finot told French media. The 12th-century cathedral is home to incalculable works of art and is one of the world's most famous tourist attractions, immortalized by Victor Hugo's 1831 novel The Hunchback of Notre Dame.

    The cause of the fire was not known, but French media quoted the Paris fire brigade(消防队) as saying the fire is "potentially linked" to a 6 million—euro($6. 88 million)renovation project on the church's spire and its 250 tons of lead. Officials opened an investigation as Paris police said there were no reported deaths. Some 400 firefighters were battling the fire well into the night.

No matter where I direct my gaze, the landscape is dotted with the skeletal frames of new structures taking shape. The familiar neighborhoods of my youth, once adorned with the charm of time-honored edifices, have largely vanished, replaced by the sleek silhouettes of contemporary high-rises. There is a rationale for this transformation: residents are in pursuit of the amenities that modern living promises.

However, the question that lingers is, how can the younger generation grasp and uphold their cultural heritage if the tangible remnants of it are continually erased? The advocacy for the conservation of historical buildings transcends mere sentimental yearning for the past. Economic considerations also lend strong support to the cause of preservation.

The restoration and safeguarding of historical districts can serve as a catalyst for economic growth, enticing tourists and small enterprises to the locality. A case in point is the historic Al Bastikiya neighborhood in Dubai, which annually attracts a multitude of visitors from across the globe. It also draws the interest of local inhabitants who are keen on exploring the history of their city.

Critics often contend that preserving historical monuments is an expensive endeavor, but numerous recent initiatives have shown this belief to be unfounded. In fact, the process of refurbishing an existing structure for alternative use can be approximately £40 per square meter less costly than even the most elementary new construction, all the while retaining the architectural elegance of the original structure. Moreover, despite the common assertion that older buildings are less energy efficient and thus have a larger environmental footprint, architects and environmental specialists assert that the most eco-friendly building is the one that already exists. New construction typically has a more detrimental environmental impact, as it necessitates the procurement and transportation of brand-new materials over potentially lengthy distances, rather than utilizing recycled materials that are readily available on site.

In essence, we recycle many other items in our daily lives, and the same principle should be applied to buildings. The act of preserving historical structures presents a multitude of opportunities; in stark contrast, demolition is an irreversible act. Once these architectural gems are lost, they are gone forever, severing an integral thread in our cultural tapestry that can never be regenerated. The decision to preserve or demolish is thus not merely one of aesthetics or economy, but also one of heritage and legacy.

Earthquakes are common natural disasters. No matter where you are, knowing how to protect yourself and your family during an earthquake is necessary.

Some experts believe that when you feel the ground is shaking, drop down, take cover under a desk and hold on. Most earthquake injuries are the result of being hit by something falling on you. You should stay indoors until the shaking stops. If you are outdoors, don't stay near buildings, trees or power lines. Many people think that in case of an earthquake, they should "get under something" like a doorway or desk, in order to avoid being hurt by falling objects. Rescue experts now say this is the wrong thing to do. For example, in the 1985 Mexico City earthquake, they found hundreds of children in schools, crushed by their desks. However, they could have survived by lying in the aisle (通道，走道) next to their desks.

So find a nice piece of furniture, a chair, a sofa, and lie down, or curl up next to it. A falling roof may compact (压实) the furniture, but will still leave a space for you to survive next to it. This also holds true if you are in a hotel room, especially at night. Get off the bed, and lie down next to it.

In San Francisco's 1989 earthquake, the upper freeway fell on the lower one. People who drove along were crushed in their cars. But they had time to get out and lie down next to their cars. Yes, their cars were crushed, but there was space from top to bottom next to the vehicles for people to survive and wait a rescue.

Doorways and stairways are very unsafe. Stay away from those.

What can we do to keep ourselves safe? Staying calm is the first and most important rule when facing accidents.