Our body clock, or natural body rhythm, influences our energy and alertness. Paying attention to it can help us choose the suitable time of the day when we best perform specific tasks.

    The reality, however, is that most of us organize the time around work demands, school deadlines, commuting or social events. Doing whatever the body feels like doing is a luxury in today's fast-paced modern society.

    But that doesn't mean it isn't worth trying. Obeying our body clock has significant health benefits. Disrupting our natural body rhythm, on the other hand, has been linked to problems such as depression, obesity, or headache, says Steve Key, a biology professor.

    When the body clock can synchronize (使…同步) the rhythms of its natural processes, it “gives us an advantage in daily life”, says Key.

    According to him, when it comes to cognitive (认知的) work, most adults perform best in the late morning. As our body temperature starts to rise just before awakening in the morning and continues to increase until midday, our memory, alertness and concentration gradually improve.

    However, he adds, our ability to concentrate typically starts to decrease soon thereafter. Most of us are more easily distracted (分心) between noon and 4 pm.

    Alertness also tends to fall after eating a meal and sleepiness tends to peak around 2 pm, making that a good time for a nap.

    Surprisingly, tiredness may increase our creative powers. For most adults, problems that require open-ended thinking are often best dealt with in the evening when they are tired, according to a study in the journal Thinking & Reasoning.

    When choosing a time of the day to exercise, paying attention to your body clock can improve results. Physical performance is usually best from about 3 to 6 pm, says Michael Smolensky, a professor of biomedical engineering.

    Of course, not everyone's body clock is the same, making it even harder to synchronize natural rhythms with daily plans.

    A girl became a volunteer in the activities of Deathbed Care, which meant visiting and taking care of a patient suffering from an incurable disease with days numbered.

    The girl was assigned to look after an old man suffering from cancer whose children lived abroad. Their living conditions were not satisfactory while the old man had a lot of savings. She was expected to comfort him and keep up his spirits.

    Every Saturday the girl came on time to keep him company, telling him stories. When he was having an intravenous drip (静脉滴注), she would help massage his arms. The doctor found the patient much improved mentally. The old man began to involve himself actively in the medical treatment and he seldom shouted at others.

    But something that happened made the doctor uneasy and puzzled. Each time the girl left, the old man would give her some money. The doctor did nothing to interfere (干涉), unwilling to offend the old man. A month later the old man showed evident signs of decline after suffering coma (昏迷) a few times.

    When rescued from the latest coma, the old man told the doctor his last wish, “I have deep sympathy for the girl. Will you be kind enough to help her finish her studies？”

    But the doctor knew that her family was well­off and she had no difficulty pursuing her studies.  Sometimes she even came to the hospital in her father's car.

    When the girl came at the weekend after the death of the old man, the doctor told her the bad news. She was very sad and burst into tears. Then she handed $ 500 to the doctor, saying, “The old man had all along thought I came to do the job because of poverty. He gave me money so that I could continue my schooling.” Now he got the answer to the puzzle. In the last period of his life, the old man found it a real pleasure to be able to help a girl badly in need.

    Tang Dynasty poets sang for about three centuries in different tones. There were many famous poets living in the Tang period such as Li Bai, Du Fu, Bai Juyi and Li Shangyin. Poems of the Tang Dynasty edited in the Qing Dynasty is a collection of more than 48,900 poem that were written by over 2,200 poets. But it didn't cover all the poems of the Tang Dynasty.

    During the Tang Dynasty, poems were recited when lovers walked under the moonlight. Poems were also recited when soldiers fought on the battlefield. People recited them in the open air or at temple fairs.

    Tang Dynasty poets wrote poems to win fame and also to develop their temperament(性情). They poured out deep feelings for their friends and criticized in injustice in the world through poems.

    In the Tang Dynasty scholars had to be poets. Their readers were not only people of high social position but also common people. Poets recited poems, women singers sang poems and other ranks of people, including old women and children, read Tang poems. This atmosphere affected foreigners who visited the country at that time. As a result, Tang poetry was introduced to some adjacent countries, like Japan and Vietnam.

    Tang poetry is a most brilliant page in the history of ancient Chinese literature. It's a miracle in the cultural history of mankind. The Tang Dynasty was a powerful empire with a vast territory. It inherited(继承)Chinese civilization that went back to ancient times, was combined with the best of other cultures and adopted the benefits of other nations in the world. Tang poetry wasn't the only spiritual wealth created by the Tang Dynasty people. Philosophy and religion, handwriting and painting and music and dance all gained new peaks of development. Tang poetry, however, was the jewel in the crown and its greatest achievement.

    A night at the movies is always a good idea. But when you leave the theater and realize you just dropped $45 on a ticket and some snacks, you'll wish you had been patient enough to wait until the movie came out on Netflix. The average movie ticket price in the United States in 2000 was $5.39; now, a ticket is over $9.

    The main reason that movie tickets have gotten so expensive is because of inflation(通货膨胀). It was actually more expensive to go to the movies in the 70s than it is now. A ticket in 1978 cost $2.34. If you plug that into an inflation calculator, the same ticket would cost you $9.46 today. According to the National Association of Theater Owners, the average cost for a ticket today is $9.11.

    Another reason you need to dip into your life savings to see a movie on the big screen is that theaters are competing with streaming services that produce their own films, such as Netflix, Hulu, and Amazon. And let's be honest, sitting at home on your couch or in your bed is more comfortable than sitting in a cold theater.

    Because of streaming technology, movie theaters have to do something to bring in customers. Attractions­including alcohol, reclining seats(躺椅), surround sound, and 3-D movies are all examples of that. And those upgrades come at a price, leading to more expensive tickets.

    "There's all that extra cost, and it's really important for theater owners and companies to make that experience as enjoyable as possible," Patrick Corcoran, vice president of the National Association of Theatre Owners told Marketplace. "Because you're offering a superb experience­audience expectations are for the latest and greatest technology. Audiences are willing to pay more for a particular experience."

Harvard Pre-College Program

    Our summer program for high school students is designed to pave the way for a successful college experience.

    HERE YOU CAN:

    Learn without limits

    Pursue your interests in courses focusing on physics, law, writing, philosophy, and a dozen other subjects.

    Live at Harvard

    You will live in a historic undergraduate house near Harvard Square.

    Your plan covers three meals a day, seven days a week.

    Have fun outside the classroom

    You might enjoy a Cirque du Sileil performance, a Red Sox game at Fenway Park, or a trip to the Museum of Science.

    ELIGIBILITY (申请资格)

    Students are academically motivated and will graduate in 2020 or 2021.

    TO APPLY

    Complete an online application and provide the following materials: the $50 nonrefundable application fee; transcripts (成绩单) with fall 2018 grades; signed rules and regulations.

    INTERNATIONAL STUDENTS

    Participants should apply for the B-2 tourist visa. If English is not your native language, submit scores from the TOEFLor IELTS language proficiency exam.

    APPLICATION TIPS

    No fee is required to start your application. You will be asked to pay the application fee only upon submitting the application.

    The scores of successful applicants are typically above 103 on the TOEFL with 25 on the written section or at least 7.5 on the IELTS with 7 on the written section.

    Use a desktop or laptop. You will be asked to write short essays as part of your application. This may be challenging to do on a mobile phone.

    You will receive an email informing you of the application status approximately three weeks after you have completed your application.

    Recently, American President Trump announced his budget. One of the budgets would cut all money to the Institute of Museum and Library services and libraries across the United States. However, as far as I'm concerned, we need to save our libraries.

    Libraries provide books and after-school programs for children. They encourage literacy (识字）with summer programs. They help inspire a life-time love of learning and reading in children of all ages. Without them, where will kids with no Internet at home do their homework? Where will kids have a place to study or borrow books after school? Therefore, we need libraries for our kids. We need them so that kids can grow up with a place, other than school , where learning and exploration is encouraged. For adults, libraries serve as a place where they can use the Internet to apply for jobs, get job training, early voting centers as well as book clubs to help make new friends. It can also serve as a place to pick up a book and learn something new. What's more, they can also borrow a book and get away from it all.

    Libraries save our information for the next generation. When we live in an age of alternative (选择性的）facts, where science is ignored in favor of personal feelings, we need libraries now more than ever. We need them to educate ourselves on the facts and hold the government responsible for them. We need them to have strong public participation.

    If you agree with me, you shouldn't be silent on this issue. You can write or call directly to tell the president to save our libraries. You can also write to both your state Senators (参议员）and your district representative. If you do not know who they are, you can find out here. Let them know this is a beneficial issue because all people use public libraries in their daily life.