Try this: For an entire day, forget about the clock. Eat when you're hungry and sleep when you're tired. What do you think will happen?

    You may be surprised to find that your day is much like most other days. You'll probably get hungry when you normally eat and tired when you normally sleep. Even though you don't know what time it is, your body does.

    These patterns of daily life are called circadian rhythms, and they are more than just habits. Inside our bodies are several clocklike systems that follow a roughly 24-hour cycle. Throughout the day and night, our internal clocks direct changes in temperature, body chemicals, hunger, sleepiness and more.

    Everyone's rhythms are unique, which is why you might like to stay up late while your sister always wants to go to bed early. But overall, everyone is programmed to feel tired at night and energetic during the day.

    Scientists have known for a long time that the light of day and the dark of night play important roles in setting our internal（内部的） clocks. Now, new discoveries are giving scientists insights into how these clocks work.

    Learning about our body clocks may help scientists understand why problems arise when we act out of step with our circadian rhythms. For example, traveling across time zones can make people wake up in the middle of the night. Regularly staying up late can make kids do worse on tests and quizzes. And working shifts at night leads to higher rates of heart disease, diabetes and obesity.

    “There is a growing sense that when we eat and when we sleep are important parts of how healthy we are,” says Steven Shea, Director of the Sleep Disorders Research Program at Brigham and Women's Hospital in Boston.

    Scientists still aren't sure why the timing of sleep matters so much, Shea says. But research findings suggest that our circadian rhythms are more important than we give them credit for.

    “During the night, we are prepared to sleep,” Shea says. “During the day, we are prepared to eat and move around. If you reverse (颠倒)what you are doing, everything is out of phase. That can have unfavorable consequences.”

SHEFFIELD

LINCOLN COLLEGE OF ENGLISH

Classes for foreign students at all levels

3 months, 6 months, 9 months and one year course

Open all year

Small class (maximum 12 students)

Library, language laboratory and listening center

Accommodation(膳食供应) with selected families

25 minutes from London

Course fees for English for one year are ￡1, 380 with reduction 减少for shorter periods of study.

    At a daycare center in Texas, children were playing outside. One of the children was Jessica Mc Clure. She was 18 months old. Her mother, who worked at the daycare center, was watching the children. Suddenly Jessica fell and disappeared. Jessica's mother screamed and ran to her.

    A well was in the yard of the center. The well was only eight inches across and a rock always covered it. But children had moved the rock. When Jessica fell, she fell right into the well.

    Jessica's mother reached inside the well, but she couldn't feel Jessica. She dialed 911 for help. Men from the fire department arrived. They discovered that Jessica was about 20 feet down in the well. For the next hour the men talked and planned Jessica's rescue.

    “We can't go down into the well,”they said.“It's too narrow. So, we're going to drill a hole next to the well. Then we'll drill a tunnel across to Jessica. When we reach her, we'll bring her through the tunnel and up through our hole.”

    The men began to drill the hole at 11 a.m. on Wednesday, October 14, 1987. The men had a difficult job; they were drilling through solid rock. During her days in the well, Jessica sometimes asked for her mother. Sometimes she slept, sometimes she cried and sometimes she sang.

    All over the world, people waited for news of Jessica. Everyone worried about her.

    At 8 p.m. on Friday, October 16, men reached Jessica and brought her up from the well. She was soon sent to hospital. Jessica was dirty, hungry, thirsty and tired. Her feet and forehead were badly injured. But Jessica was alive.

    After Jessica's rescue, one of the rescuers made a metal cover for the well, saying,“To Jessica, with love from all of us.”

    A music festival is a community event focusing on live performances of singing and instrument playing that is often presented with a theme. On the list are the music festivals for fans around the world. Find your favorite now!

    Field Day

    January 1, 2018. Sydney

    Field Pay means New Year's Day for young people in Sydney. Seen as the city's original multi－stage party,, it's a gathering of friends coming together for a great fun - filled first day of the year. There's an air of hope and positive energy on a perfect summer's day.

    The Envision Festival

    February 22 – 25, 2018, Uvita

    The Envision Festival is an annual gathering in Costa Rica that aims to provide an

opportunity for different cultures to work with one another to create a better community. The festival encourages people to practice art, music, dance performances, and education. Meanwhile, our connection with nature is expected to be strengthened.

    The McDowell Mountain Music Festival

    March 2 - 4, 2018, Phoenix

    The McDowell Mountain Music Festival is Phoenix、musical celera ,on of community culture. Since its founding in 2004 f it is the only 100% non – profit music festival designed to support, entertain and educate the community. The festival attracts thousands of visitors each year from around the country, and it is an opportunity to experience true culture.

    The Old Settler's Music Festival

    April 19 - 22, 2018, Dale

    The Old Settler's Music Festival is a nationally known music festival for American music. The festival is held in the country of Texas at the height of the wild flower season. The Old Settler's Music Festival offers great music and activities for the whole family.

    For years, decades in fact, I've puzzled over the response most people have when I tell them I mostly travel alone.

    "You're so brave!"

    Why is it that a woman travelling alone, as I have often done for months at a time, is perceived to be "brave", whereas men who travel alone are entirely unremarkable?

You are only brave when you are afraid of something but still do it anyway. I have never been afraid of travelling alone.

    The first time I travelled alone was when I was 19. I was due to travel in Europe with a friend at the end of the summer. She announced by letter two days before our departure that she would be leaving me halfway at Vienna. It was too late by then to rope in another friend, so it was either to go home after Vienna, or keep going by myself. I kept going. I got on trains by myself, checked into hostels by myself and found my way around by myself. It was weird at first, but later I stopped worrying about it.

    When I got back to Ireland after that trip, I felt proud of myself. I had done something I had assumed would be hard, and it had turned out to be not hard at all.

    That was three decades ago, and since then I have travelled all over the world, usually on my own. I still do what I did then, which is to keep a diary. The greatest gift of solo travel has been those I've met along the way. I may have set off alone each time but I've encountered many people who became important to me. I met my husband in Kathmandu, Nepal. I met lifelong friends in Australia, Poland, Hungary, Turkey, India, Indonesia and many other places.

    What are two things that make humans different from animals? One is language, and the other is music. It is true that some animals can sing (and many birds sing. better than a lot of people). However, the songs of animals, such as birds and whales, are very limited. It is also true that humans, not animals, have developed musical instruments.

    Music is strange stuff. It is clearly different from language. However, people can use music to communicate things—especially their emotions. When music is combined with speech in a song, it is a very powerful form of communication.

    If music is truly different from speech, then we should process music and language in different parts of the brain. The scientific evidence suggests that this is true. Sometimes people who suffer brain damage lose their ability to process language. However, they don't automatically lose their musical abilities. For example, Vissarion Shebalin, a Russian composer, had a stroke in 1953. It injured the left side of his brain. He could no longer speak or understand speech. He could, however, still compose music until his death ten years later. On the other hand, sometimes strokes cause people to lose their musical ability, but they can still speak and understand speech.

    Why does music have such a strong effect on us? That is a harder question to answer. Geoffrey Miller, a researcher at University College, London, thinks that music and love have a strong connection. Music requires special talent, practice, and physical ability. That's why it may be a way of showing your fitness to be someone's mate. For example, singing in tune or playing a musical instrument requires fine muscular control. You also need a good memory to remember the notes. And playing or singing those notes correctly suggests that your hearing is in excellent condition. Finally, when a man sings to the woman he loves, it may be a way of showing off.

    However, Miller's theory still doesn't explain why certain combinations of sounds influence our emotions so deeply. For scientists, this is clearly an area that needs further research of sounds influence our emotions so deeply. For scientists, this is clearly an area that needs further research.