【推荐1】Right now， social media is flooded with photos of people with their celery（芹菜）juice． They say that the green drink cured them of headaches， skin conditions， and cleared poisons in their bodies， and left them with a feeling of pure joy．

Celery is suddenly in the spotlight． It's got a respectable amount of vitamin C and B， and has a little bit of fiber． It's full of water and refreshing． I've no doubt that celery juice helps people feel more fresh and juicy in the morning． And I know from personal experience that a green drink is a nice， light way to start the day．

But the magic statements about celery juice leave me more than a little doubt． If celery juice did， indeed， wash viruses out of the body and cure headaches， wouldn't the world be free of headache medicine？ And the medical explanations surrounding celery juice's powers just don't make sense一for instance， that drinking celery juice increases bile（胆汁） or that it "restores your central nervous system"． Huh？

There are also drawbacks of juicing in general． It's quicker to drink juice than it is to eat fruits and vegetables， so it may feel less satisfying than eating whole food． You also lose the fiber when juicing． Celery juice is made by putting the stalks （茎秆） through a juicer or processing them in a regular fruit mixer and straining the mixture through cheesecloth or a nut-milk bag， leaving all the fiber behind． It's stated that removing the fiber from celery makes the healing powers stronger， but unlike celery juice， fiber is actually proven to be good for you． The benefits range from keeping you regular to lowering blood pressure． To get these fiber benefits， throw a stalk of celery into your favorite fruit drink， so you're getting the whole vegetable， not just the juice．

My two cents： If you want to try celery juice， there aren't drawbacks beyond the cost and the taste． But don't set your expectations for healing too high．

【推荐3】Have you ever wondered why you sometimes take an almost immediate liking to a person you have just met? We often get the first impression of a person based on the colour of a person’s skin or the manner in which he or she dresses. Meaning is conveyed(传递) not only by words or verbal languages but also by nonverbal communication systems, such as body behaviour.

Nonverbal communication is important because we use the actions of others to learn about their emotional states. Our emotions are reflected in our posture, face, and eyes-be it fear, joy, anger, or sadness-- so we can express them without ever saying a word. For this reason, most of us depend heavily on what we learn through our eyes.

Nonverbal communication is significant in human interaction because it is usually responsible for the first impressions. More importantly, those first messages usually influence the perception(感知) of everything else that follows. Even how we select friends and partners is based on first impressions with nonverbal communication.

Nonverbal communication is important because it is culture-related. It is based on different beliefs, religions, values and customs in different cultures. When, where, how, and to whom people display his or her specific nonverbal behaviour is greatly affected by culture and context. Culture determines what the appropriate nonverbal behaviour is. For example, feelings of friendship exist everywhere but their expression varies. It maybe appropriate in some countries for men to hug each other and for women to hold hands; in other countries these displays of affection(情感) may be shocking. Each culture has its own specific interpretation on nonverbal communication. What is acceptable in one culture may be completely unacceptable in another. One culture may determine that snapping fingers(打响指) to call a waiter is acceptable; another may consider this gesture rude.

【推荐2】The geographical location of a country and its physical characteristics are very important to its development and progress. The United States is very fortunate in this respect.

First of all, it has a good climate. In almost all sections of the country it is possible to live comfortably during the whole year. It is true that in the south it sometimes gets very hot, and in the north very cold. But the people who live in these regions become accustomed to the climate and never suffer very much when the weather is either very hot or very cold.

In a large country there is usually a great variety of different physical characteristics. In the United States, there are wide plains and high mountains, thousands of lakes and rivets of all sizes, cool forests and hot deserts, and a coastline several thousand miles long.

The many lakes and rivers, as well as the long coastline, have been of great importance to the development of the country, since they made possible the easy transportation of people and all the things people need. Transportation by water is still necessary and important. In modern times, however, trains, automobiles, trucks and airplanes are doing much of the work which was formerly done by ships and boats.

【推荐3】The earth is warming. The past years are the warmest on record. Greenhouse gases from human activities are responsible for 1.1°C of average warming in the 20^th century. What we’re experiencing is different from the global average. We experience extreme weather — serious heatwaves, violent storms and historic floods.

We won’t feel the impact of our efforts for decades. But we must know our future today so we can act now. To develop the best strategies for adaptation, we need climate models to predict the climate in different areas over decades. Unlike predicting the weather, climate models are difficult modeling the physics, chemistry and biology of the atmosphere, waters, ice, land and human activities.

Greater resolution (分辨率) is needed to model changes in the global climate. Scientists estimate that it will demand billions of times more computing power than what’s available. It will take decades to achieve that through the ordinary course of computing advances.

For the first time, we have the technology to do that. We can achieve million-x speedups by combining three technologies: GPU-accelerated computing; breakthroughs in physics-informed neural (神经的) networks and AI supercomputers, along with vast quantities of data to learn from. With these techniques, we may have within our grasp the billion-x leap needed to do the climate modeling. And with more accurate predictions, people and nations will act correctly.

This week, plans to build the world’s most powerful AI supercomputer used to predict climate change are announced. Named Earth-2, the system will create a digital twin of the Earth. The system would be the climate change to Cambridge-l, the world’s most powerful AI supercomputer for healthcare research.