I look around and can't recognize where I am. It seems familiar but distant. I see my friends gather by a stage where music is playing and I run over. As I begin running towards them, they become further and further away. I keep calling them, but no one hears me. I start hearing a distant alarm-like sound and I am transported away. I woke up in a daze sitting in my bed.

    “Oh, it was only a dream,” I said to myself. I have always had vivid and intense dreams. It feels like I haven't even slept because I have been living out my dreams during my sleep.

    Today, dreaming is being studied even more than ever. Some say that dreams are how your receptors make sense of random thoughts while you sleep. Some say that you can't dream of a face you have never seen before, so everyone you see in your dreams you have at least laid eyes on at one time or another.

    Other people think dreams are ways of expressing stress or internal feelings you may be experiencing. A lot of people say that they have dreams about being chased.

    A common interpretation of the “being chased” dream is that you are feeling threatened. Some dream interpretation websites say you should try to reflect on what or who is chasing you to get a better idea of what is making you feel this way.

    Another dream that is often experienced is flying. This dream has a much more positive interpretation, which is that you are feeling free or have broken out of a bad situation such as a relationship turned sour or a job you hate.

Unfortunately, you may forget half of your dream within five minutes of waking up and within 10 minutes, you usually forget 90 percent of it.

    Dreamologists, people who devote time to the study and interpretation of dreams, suggest if you want to try to remember and study your dreams you should keep a journal beside your bed and write down what you dreamt as soon as you wake up so you can reflect on it later.

    Once upon a time, a daughter complained to her father that her life was unhappy and that she was tired of struggling all the time.

    Her father, a chef, took her to the kitchen. He filled three pots with water and placed each on a high fire. Once the three pots began to boil, he placed potatoes, eggs and coffee beans in them. After 20 minutes, he took them out, putting the potatoes and eggs in a bowl and the coffee in a cup. Turning to his daughter, he said, “Look closer, and touch the potatoes.” She did and noted that they were soft. He then asked her to take an egg and break it. After pulling off the shell, she observed the hard-boiled egg. Finally, he asked her to taste the coffee. Its good smell brought a smile to her face.

    “Father, what does this mean?” she asked. He then explained that the potatoes, the eggs and the coffee beans were in the same adversity (逆境)—the boiling water. However, each one reacted differently.

    The strong and hard potato became soft and weak in boiling water. The egg was fragile, with the thin outer shell protecting its liquid until it was put in the boiling water. Then the inside of the egg became hard. However, the coffee beans were unique. After they were exposed to the boiling water, they changed the water and created something new. “Which one do you want to be like?” he asked. “When adversity knocks on your door, how will you respond?”

    In life, challenges happen to us all, but the only thing that truly matters is what happens within us.

    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.

    The latest IPCC report does not mince words(直言不讳地) about the state of our planet: we must act now to achieve global change at a scale that has “no documented historical precedent(先例)” in order to avoid the climate disaster that would result from a 2 degree C rise in average global temperature. Climate change already affects the world's most helpless people including poor rural communities that depend on the land for their livings and coastal communities. Indeed, we have already seen the clear asymmetry(不对称) of suffering resulting from extreme weather events, such as hurricanes, floods, droughts, wildfires and more.

    So far, advocates and politicians have tended to focus on reducing fossil fuel(矿物燃料) consumption through technology and/or policy, such as a sharp carbon tax, as climate solutions. These proposals are, of course, essential to reducing manmade carbon emissions(排放)-71 percent of which are produced by just 100 fossil fuel companies.

    Yet the international focus on fossil fuels has overshadowed(使......显得不重要) the most powerful and cost-efficient carbon-capture technology the world has yet seen: forests. Recent scientific research confirms that forests and other “natural climate solutions” are absolutely essential in reducing climate change. In fact, natural climate solutions can help us achieve 37 percent of our climate target, even though they currently receive only 2.5 percent of public climate financing.

    Forests' power to store carbon dioxide through the simple process of tree growth is staggering: one tree can even store an average of about 48 pounds of carbon dioxide in one year. Recent research show undamaged forests are capable of storing the same amount of the carbon dioxide emissions of entire countries such as Peru and Colombia.

    For this reason, policy makers and business leaders must create and strengthen ambitious policies to prevent deforestation, and support the sustainable management of standing forests in the fight against climate change. Protecting the world's forests ensures they can continue to provide essential functions aside from climate stability, including producing oxygen, filtering water and supporting biodiversity. Not only do all the world's people depend on forests to provide clean air, clean water，oxygen, and medicines, but 1.6 billion people rely on them directly for their livelihoods.

    I was now in my twenty-third year of residence in this island and was so naturalized to the place and to the manner of living that I finally enjoyed the certainty that no savagesc(野人) would come to the place to disturb me, and that I could have been content to spend the rest of my time there, even to the last moment, till I had laid me down and died, like the old goat in the cave.

    I had also arrived to some little recreations and amusements, which made the time pass more pleasantly with me a great deal than it did before.

    At first, I had taught my Poll to speak. And he did it so familiarly and talked so clearly and plainly that it was very pleasant to me. And he lived with me no less than six years. How long he might live afterwards, I don't know; though I know people have an idea in Brazil that they live a hundred years. Perhaps poor Poll may be alive there still, calling Poor Robin Crusoe to this day. I wish no other English man the ill luck to come there and hear him. But if he did, he would certainly believe it was the devil.

    My dog was a very pleasant and loving companion to me, for no less than sixteen years of my time, and then died of mere old age.

    As for my cats, they multiplied to that degree that I had to shoot several of them at first to keep them from eating up all I had.

    Besides these, I had two more parrots which talked pretty well and would all call Robin Crusoe, but neither like my first. Nor indeed did I take the pains with any of them that I had done with him. I had also several tame sea-fowls, whose names I don't know, who I caught upon the shore and cut their wings and the little stakes which I had planted before my castle wall being now grown up to a good thick bush; these fowls all lived among these low trees and bred there, which was very agreeable to me; so that as I said above, I began to be very well contented with the life I led, if it might have been secured from the threat of the savages.

    Meeting people from another culture can be difficult. From the beginning, people may send the wrong signal. Or they may pay no attention to signals from another person who is trying to develop a relationship.

    Different cultures stress the importance of relationship building to a greater or lesser degree. For example, business in some countries is not possible until there is a relationship of trust. Even with people at work, it is necessary to spend a lot of time in "small talk", usually over a glass of tea, before they do any job. In many European countries, like the UK or France, people find it easier to build up a lasting working relationship at restaurants or cafe rather than at the office.

    Talk and silence may also be different in some cultures. I once made a speech in Thailand. I had expected my speech to be a success and start a lively discussion, instead there was an uncomfortable silence. The people present just stared at me and smiled. After getting to know their ways better, I realized that they thought I was talking too much. In my own culture, we express meaning mainly through words, but people there sometimes feel too many words are unnecessary.

    Even within Northern Europe, cultural differences can cause serious problems. Certainly, English and German cultures share similar values, however, Germans prefer to get down to business more quickly. We think that they are rude. In fact, this is just because one culture starts discussions and makes decisions more quickly.

    People from different parts of the world have different values, and sometimes these values are quite against each other. However, if we can understand them better, a multicultural environment will offer a wonderful chance for us to learn from each other.