New friends. Fresh lifestyle. Better career opportunities…Those are attractions of overseas study for young people in China. “Start early, finish strong,” some of them say.

    More than 300 universities from 27 countries and regions were represented at last weekend's international education exposition(展览).

    Mary bought a dress in a women's clothing store.She felt very happy about buying the dress until she got home. Then she remembered she had left her purse at the store.It was the third time that month that Mary had forgotten something important.Mary was angry with herself.She said,“Am I losing it?”

    Emma was teaching a class in mathematics at a college.She began to explain to the students how to solve a very difficult problem.She understood it very well.But somehow,at that moment,she could not explain it.Emma said,“I must be losing it.”

    Americans seem to have a lot of concern about losing it.At least that is what you would think from hearing them talk.They use the expression when they feel they are losing control.It can mean losing emotional control.Or losing the ability to do something.Or losing intelligence.

    Word experts differ about how the expression started.Some believe it came from television programs popular in the 1980s.Others believe it began with psychologists,who deal with how people think,feel and act.

    “We Americans have many concerns about controlling our lives.Perhaps we worry too much,”one psychologist said.“In many situations to say you are losing it eases the tension（不安）.”

    It's healthy.And most people who say they are having a problem are not losing it.

    People may feel more like they are losing it when they are “down in the dumps”.Word expert Charles Funk says people have been feeling down in the dumps for more than 400 years.The word dumps probably comes from Northern European countries.The languages of Denmark and Norway both have similar words.The words mean to fall suddenly.Americans borrowed this saying.And,over the years,it has become a popular way of expressing sadness.

    Having a learning disability doesn't mean you can't learn, but you'll need some help and need to work extra hard. If you have a learning disability such as dyslexia or dyscalculia, remember that you are not slow or stupid.

    Learning disabilities can be genetic. That means they can be passed down in families through the genes. But kids today have an advantage over their parents. Learning experts now know a lot more about the brain and how learning works, and it's easier for kids to get the help they need.

    Dyslexia is a learning disability that means a kid has a lot of trouble reading and writing. Kids who have trouble with math may have dyscalculia. Other kids may have language disorders, meaning they have trouble understanding language and understanding what they read.

    It can be confusing, though. What qualifies as “trouble" enough to be diagnosed as a learning disability? Reading, doing math, and writing letters may be tough for lots of kids at first. But when those troubles don't fade away and it's really difficult to make any progress, it's possible that the kid has a learning disability.

    Finding out you have a learning disability can be upsetting. You might feel different from everyone else. But the truth is that learning disabilities are pretty common. And if your learning specialist or psychologist has figured out which one you're facing, you're on the right track. Now, you can start getting the help you need to do better in school.

    But for this special help to really work, you'll need to practice the new skills you're learning. It may take a lot of efforts every day. That can be a challenge, but you can do it soon, you'll enjoy the results of all your hard work: more fun and success at school.

    Machines equipped with artificial intelligence (AI) have performed better than human beings in a high-level test of reading comprehension. Two natural language processing tools received higher test scores than humans in recent exams.

    One of the tools is a product of the American software maker Microsoft. The other was created by the Chinese online seller Alibaba Group. The company said that a deep-learning model developed by its Institute of Data Science of Technologies was the first to beat a human score in the reading comprehension test.

    The test is called the Stanford Question Answering Dataset. It was developed by researchers at Stanford University in California. It has over 100,000 questions and answers. They are based on information found in over 500 stories from the Wikipedia website. The answers to all the questions come from the reading material.

    The AI-powered machines were tested on whether they could provide exact answers to the questions after processing large amounts of information.

    Alibaba said its deep neural (神经的) network model received an “Exact Match” score of 82.44 on the Stanford test. Microsoft reported that a team at Microsoft Research Asia had a score of 82.65. It said the human score on the same questions and answers was 82.304. Many research organizations also appeared on the list—all with scores below 82.

    Alibaba said it has already used its reading comprehension model in different parts of its business. For example, the company is using machines to answer many incoming telephone calls from customers. The company says in the future, the technology could enable machines to guide visitors through museums or provide advice to medical patients.

    Microsoft noted that, overall, people are still much better than machines at understanding the complexity and nuances (细微差别) of language.

Damian Stefaniuk and his colleagues at Massachusetts Institute of Technology （MIT） have developed a novel energy storage device—a supercapacitor— using three basic, inexpensive materials： water, cement, and a soot （煤灰）, which can carry electricity. 

Supercapacitors are highly efficient at storing energy but differ from batteries in some important ways. They can charge much more quickly than a lithium （锂） battery and don't experience the same level of performance decline over time. But supercapacitors also release the power they store rapidly, making them less useful in devices such as mobile phones, laptops or electric cars where a steady supply of energy is needed over an extended period of time. 

Yet according to Stefaniuk, these supercapacitors could make an important contribution to efforts to reduce carbon emissions and make the global economy more environmentally friendly. "If it can be scaled up, the technology can help solve an important issue— the storing of renewable energy," he says. 

He and his fellow researchers at MIT envision several applications for their supercapacitors. One might be to create roads that store solar energy and then release it to recharge electric cars wirelessly as they drive along a road. The rapid release of energy from the supercapacitors would allow vehicles to get a rapid boost to their batteries. Another application would be using supercapacitors in the foundations or walls of houses, so that these parts of the house not only support the structure but also store energy. 

"But it's still early stages. Right now, the supercapacitor made from building materials can only store just under 300 watt-hours per cubic meter, enough to power a 10-watt LED light for 30 hours. The power might seem low compared to regular batteries, but a foundation made from 30-40 cubic meters of this material could meet the daily energy needs of a house," says Stefaniuk. "Since this material is used so widely around the world, it has the potential to be very competitive and useful for energy storage."