Recently, a painting of actress Elizabeth Taylor, which was drawn by American artist and filmmaker Andy Warhol, sold for US $63 million. Another simple black-and-white image of a Coca-Cola bottle sold for US $35 million. But the all-time record for a Warhol painting is $100 million for a piece titled “Eight Elvises”. What's amazing is not that the pieces sold for so much, but the fact that they are not what you would call traditional art. They are “pop art”, art based on simple images of things and people from advertising, movies, music and day-to-day life.

    Born in the 1920s, Warhol grew up mostly separated from other children due to (由于) health problems. He spent a lot of his time alone drawing and then went on to study art in college. He began his career as a commercial (商业的) artist, creating pictures for magazine articles and newspaper ads. That inspired him to experiment with pop art and he hosted America's first pop art exhibition in the 1960s. The show met with a lot of discussion with some people saying that what he was doing was not art.

    Warhol followed his first works with a series we are all familiar with — paintings of Coca-Cola bottles, Brillo soap pad boxes, and portraits (肖像) of famous people. Soon after, Warhol stopped creating his own artwork. Instead, he had assistants and other artists create them at his studio called “The Factory”. Warhol wanted to show the world that art doesn't have to be complex or original; it can be created by anyone using ordinary things.

    Today, Warhol's work is unmistakable in its uniqueness. No matter how you may feel about his work, one thing cannot be argued. He introduced the world to a whole new art form, inspiring future generations of artists, and eventually becoming one of the most famous and successful pop art artists in the world.

    Retirement (退休) should be time of joy and freedom. However, for some people retirement comes with feelings of depression (沮丧), which makes life difficult for them.

    Retirement is a major life change. Even good changes usually involve some kinds of loss. When you retire, you find yourself lacking whatever working used to provide. That could include, for example, 1. knowing you're working for society, 2. getting admiration from your skills, 3. having “aha” moments when you solve problems, 4. having people to socialize with, and 5. simply having a place to go and a reason to get out of bed every day. For most people, there's a financial loss, too. Also, retirement age is a time when a lot of people have to deal with losing their parents or having serious health problems of their own.

    Because of all these, retirees are more likely to get depressed.

    Depression is very harmful. First, depression can make physical health problems worse. Second, it takes a toll on relationships, because it can make people angry. Third, it's hard to get  much done when you're depressed.

    What can we do to overcome (克服) the feelings of depression? First, do all the things that help depression in general: drink enough water, exercise, talk to friends, have a hobby, laugh, and spend time in nature. If you feel depressed more often than not, it's probably time to talk to a doctor about your feelings. Second, it's important to keep busy and get out of the house when you can. Make specific plans with friends. Take a class Volunteer. Or just make sure you start each day with some kind of goal. Third, try to focus on what you've gained by retiring. Think about what you may have now that you wished you had before you were able to retire. For example, days that are less stressful, a chance to rest and take better care of your body, more time for your family and yourself. To write, to start a hobby and to learn something new are all new possibilities. Finally, tell your story. You've lived a long time and you become an oral historian each time you talk with someone about your experiences. You can also write in a journal or make a video recording of your memories. Telling your stories can help you look back on your life and career with a sense of wholeness and achievements.

    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（生理节奏）, 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 inner clocks direct changes in temperature, body chemicals, hunger, sleepiness and more.

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

    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 in tests.

    "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 Program at Brigham and Women's Hospital in Boston.

    One way to learn about how our body clocks tick is to mess them up and see what happens. That's what neurologist（神经病学家）Frank Scheer and his workmates did in a recent study.

    Staying up night after night, their studies suggest, could make kids extra hungry and more likely to gain weight. And regularly sleeping too little, Scheer says, may be one cause of the recent increase in childhood obesity.

    The Pacific island nation of Nauru used to be a beautiful place. Now it is an ecological disaster area. Nauru's heartbreaking story could have one good consequence — other countries might learn from its mistakes.

    For thousands of years, Polynesian people lived in the remote island of Nauru, far from western civilization. The first European to arrive was John Fearn in 1798. He was the British captain of the Hunter, a whaling ship. He called the island Pleasant Island.

    However, because it was very remote, Nauru had little communication with Europeans at first. The whaling ships and other traders began to visit, bringing guns and alcohol. These elements destroyed the social balance of the twelve family groups on the island. A ten-year civil war started, which reduced the population from 1,400 to 900.

    Nauru's real troubles began in 1899 when a British mining company discovered phosphate (磷酸盐)on the island. In fact, it found that the island of Nauru was nearly all phosphate, which was a very important fertilizer for farming. The company began mining the phosphate.

    A phosphate mine is not a hole in the ground; it is a strip mine(露天矿). When a company strip-mines, it removes the top layer of soil. Then it takes away the material it wants. Strip mining totally destroys the land. Gradually, the lovely island of Nauru started to look like the moon.

    In 1968, Nauru became one of the richest countries in the world. Every year the government received millions and millions of dollars for its phosphate.

    Unfortunately, the leaders invested the money unwisely and lost millions of dollars. In addition, they used millions more dollars for personal expenses. Soon people realized that they had a terrible problem — their phosphate was running out. Ninety percent of their island was destroyed and they had nothing. By 2000, Nauru was financially ruined. Experts say that it would take approximately $433,600,000 and more than 20 years to repair the island. This will probably never happen.

The Harbourside Development is one of the world's most exciting places to shop. It's built right on the edge of Sydney Harbour, and there are over 200 shops, selling everything from home­made sweets to the very latest clothes in fashion; from Australian souvenirs to Swiss watches and Japanese cameras.

The Australian Wildlife Park has been specially built to give people an extra close look at Australia's native animals. Have your photo taken with a kangaroo，touch and feed koala bears. There are talks every afternoon about these animals, which are only found in this part of the world. There is also an excellent souvenir shop.

A visit to the Australian Museum is like an adventure across Australia. There are shows on the people and their way of life and the whole continent. Talks and guided tours help to make your visit unforgettable. There's also a café and a good book shop, selling excellent maps.

Taronga Zoo has Australia's finest collection of rainforest birds and sea­life centre which has many of the fish that can be found off the coasts of Australia and New Zealand. Taronga is also famous for its large group of South East Asian monkeys. Fast food can be got at cafés.

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