Do you often feel lonely? What do you do when you feel that way? Hide yourself away and spend your time reading, watching TV or walking around?

You might think that feeling lonely is just like feeling happy, sad or scared — that it's just one of your various moods. That is true. However, if you let yourself be lonely for too long without dealing with it, you could be making a serious mistake.

    Doctors have known for some time that feeling lonely is bad for the mind. It can lead to mental health problems such as depression, stress and reduce confidence. “Being lonely means not feeling connected or cared for, but it's not about being mentally alone,” Lisa Jaremka, scientist from Ohio State University, US, told Live Science in January. And there's growing evidence that not having friends is connected with physical illness as well.

    In 2006, for example, scientists studied 2,800 women who had cancer. They found that those who had few friends or family were five times more likely to die of their disease than women with many social contacts. Also, even healthy people had a better chance of falling ill if they felt left out by others, according to the BBC.

    The results have scientists thinking that loneliness might hurt the immune system(免疫系统), which protects the body from diseases.

    Hoping to prove this theory, Jaremka and her research team put volunteers(志愿者) through a stress test. During the test, volunteers were asked to make an unprepared speech in front of a group of stony-faced people. The researchers found that volunteers who said they were lonely in their daily lives felt more stress during the test. And their blood samples showed that all the stress had managed to cause harmful changes to their immune system.

     “Loneliness has been thought of in many ways as a chronic stressor(慢性增压器) — a socially painful situation that can last for quite a long time, ” explained Jaremka, who led the study.

    The number of people suffering from loneliness is increasing all over the world. However, solving the problem is easier said than done. It won't work to just “tell anyone to go out and find someone to love you”, said Jaremka. “We need to create support networks.”

    I went through a training program and became a literacy volunteer(扫盲志愿者)last summer. The training I received, though excellent, did not tell me how it was to work with a real student. When I began to discover what other people's lives were like because they could not read, I realized the true importance of reading.

    My first student Marie was a 44-year-old single mother of three. In the first lesson, I found out she walked two miles to the nearest supermarket twice a week because she didn't know which bus to take. When I told her I would get her a bus schedule, she told me it would not help because she could not read it. She said she also had difficulty once she got to the supermarket because she couldn't always remember what she needed. Since she did not know words, she could not write out a shopping list. Also, she could only recognize items by sight, so if the product had a different label(标识), she would not recognize it as the product she wanted.

    As we worked together, learning how to read built Marie's self-confidence, which encouraged her to continue her studies. She began to make rapid progress and was even able to take the bus to the supermarket. After this successful trip, she reported how self-confident she felt. At the end of the program, she began helping her youngest son, Tony, a shy first grader, with his reading. As she described this experience, I was proud of myself as well. I found that helping Marie to build herself-confidence was more rewarding than anything I had ever done before.

    As a literacy volunteer, I learned a great deal about teaching and helping others. In fact, I may have learned more from the experience than Marie did.

    "Everybody is a genius.But if you judge a fish by its ability to climb a tree,it will live its whole life believing that it is stupid."—Albert Einstein

    If you have a kid with special needs in the school system,chances are you have come across that saying hanging on a classroom wall.My five-year-old daughter Syona has cerebral palsy（脑瘫）and it means,combined with her communication and sight problems,that normal standard isn't always an accurate measure of her abilities.

    By now you have probably heard about Chris Ulmer,the 26-yearold teacher in Jacksonville,Florida,who starts his special education class by calling up each student individually to give them much admiration and a high-five.I couldn't help but be reminded of Syona's teacher and how she supports each kid in a very similar way.Ulmer recently shared a video of his teaching experience."I have seen their confidence increase rapidly."he said.All I could think was: how lucky these students are to have such good teachers.

    Syona's teacher has an attitude that can best be summarized in one word: awesome.Her teacher doesn't focus on what can't be done—she focuses on what can be done.Over the past several months,my husband Dilip and I have seen Syona's confidence increase tenfold.She uses words she wouldn't have thought of using before.She recently told me about her classmate's trip to Ecuador and was very proud when I understood her on the first try.

    I actually wonder what the influence would be if we did something similar to what Ulmer does with his students in our home.We've recently started our day by reminding each other of the good qualities we all possess.If we are reminded of our strengths on a regular basis,we will become increasingly confident about progress and success.

    The medical world is gradually realizing that the quality of the environment in hospital may play an important role in helping patients to get better.

    As part of a nationwide effort in Britain to bring art out of the museums and into public places, some of the country's best artists have been called in to change older hospitals and to soften the hard edges of modern buildings. Of the 2500 national health service hospitals in Britain, almost 100 now have very valuable collections of present art in passages, waiting areas and treatment rooms.

    These recent movements first started by one artist, Peter Senior, who set up his studio at a Manchester hospital on northeastern England during the early 1970s. He felt the artist had lost his place in modern society, and that art should be enjoyed by a wider audience.

    A common hospital waiting room might have as many as 5,000 visitors each week. What a better place to hold regular exhibitions of art! Senior held the first exhibition of his own paintings in the outpatients waiting area of the Manchester Royal Hospital in 1975. Believed to be Britain's first hospital artist, Senior was so much in demand that he was soon joined by a team of six young art school graduates.

    The effect is striking. Now in the passages and waiting rooms the visitor experiences a full view of fresh colours, playful images and restful courtyards.

    The quality of the environment may reduce the need for expensive drugs when a patient is recovering from an illness. A study has shown that patients who had a view onto garden needed half the number of strong pain killers compared with patients who had no view at all or only a brick wall to look at.

    We have a strange obsession with the concept of perfection. “If I have the perfect parents and perfect grades, then I would be happy.” Under cultural influence, we seek what we can't have without remembering that we don't actually need to be perfect. Imperfection allows us to be human.

    Parents, teachers and other high-achieving peers will have us believe that we must be perfect if we wish to remain competitive. However, what job or school requires you to have a 2400 SAT, 4.0 GPA and develop a cure for some form of cancer by the age of 18? Although these would be great achievements, are they worth the cost of sleep? We feel like we need the perfect grades to get into the perfect college that will provide us with the perfect education necessary to obtain the perfect job. With this misconception, when writing our resumes(简历), we then seek out experiences that we think may help build a good name for ourselves. Feeding on our thirst for perfection, some college and career industries have been set up claiming to help us reach our goals.

    The truth is, you only need to be good enough. Don't worry about anything secondary to your passions. You won't become an expert at anything if you spend your time trying to succeed in everything you do. You only become an expert when you devote your time to the one or two projects that truly bring you joy.

    As members of this society, we have a responsibility to be excellent in what we do, not perfect. Although perfection can be a goal, it should not be the only goal. We only have 24 hours in a day. Thus, we need to prioritize(优先选择)what we want to do and cut out the activities we cannot do. If you enjoy debating, take a law class and see how it suits you. If you enjoy cooking, experiment in the kitchen and see what you can make!

    Try as hard as you can and let your future worry about itself. Worry about your task at hand and you will be successful in achieving your dreams. Above all, remember that you are going to be okay.

Pieter Bruegel's iconic 1565 painting The Harvesters hangs at The Metropolitan Museum of Art. The work shows people harvesting wheat nearly as tall as they are. "Nowadays, however, if you walk through a wheat field, you basically see that wheat is about knee-height. The reduced height is essentially a consequence of being bred (培育) along with genes for increasing production to feed a growing population," biologist De Smet explained.

De Smet said wheat was just one example of how historical artwork could allow us to track the transformation of food crops over time. He teamed up with art historian Vergauwen, a friend since childhood, to document such art work around the world. They have been mainly looking at things where they can spot changes in shape, color and size.

Their interest in plants in artwork began with a visit to the Hermitage Museum, where they noticed an odd-looking watermelon in an early-17th-century painting. It appeared to be pale and white on the inside. Biologist De Smet assumed the painter had done a poor job. But art historian Vergauwen had a different idea. "No, this is one of the best painters ever from that era. So if he painted it like that, that's the way it must have looked like," he explained.

Other paintings revealed that both red and white watermelons were grown during the 17th century. "With all the genetic knowledge we now have, we can look at how something comes about in more detail," said De Smet. "For example, until the 18th century, European strawberries appeared tiny in paintings. They then grew in size as they were crossbred with North American varieties."

Ultimately, the team hopes to create an online research database of historical plant artwork. They seek the contributions of art enthusiasts around the world via the social media. "However," Vergauwen reminds, "if you're going to use, for example, Picasso to try and understand how a pear looked in the early 20th century, you might be misled."