On May 23, 1989, Stefania Follini came out from a cave at Carlsbad, New Mexico. She hadn't seen the sun for eighteen and a half weeks. Stefania was in a research program, and the scientists in the program were studying body rhythms. In this experiment Stefania had spent 130days in a cave, 30 feet in depth.

    During her time in the cave, Stefania had been completely alone except for two white mice. Her living place had been very comfortable, but there had been nothing to tell her the time. She'd had no clocks or watches, no television or radio. There had been no natural light and the temperature had always been kept at 21℃.

    The results were very interesting. Stefania had been in the cave for over four months, but she thought she had been there for only two. Her body clock had changed. She hadn't kept to a 24-hour day, she had stayed awake for 20～25 hours and then had slept for 10 hours. She had eaten fewer meals and had lost 171bs in weight as a result! She had also become rather depressed.

    How had she spent her time in the cave? As part of the experiment she'd done some physical and mental tests. She'd recorded her daily activities and the results of the tests on a computer. This computer had been specially programmed for the project. Whenever she was free, she'd played cards, read books and listened to music. She'd also learned French from tapes.

    The experiment showed that our body clocks are affected by light and temperature. For example， the pattern of day and night makes us wake up and go to sleep. However, people are affected in different ways. Some people wake up naturally at 5:00 a.m., but others don't start to wake up till 9:00 or 10:00 a.m. This affects the whole daily rhythm. As a result the early risers are at their best in the late morning. The late risers, on the other hand, are tired during the day and only come to life in the afternoon or evening!

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    Living in the wild can be hard. Finding food and staying safe aren't easy. Each day, animals struggle to survive in their habitats. Not all animals get by on their own. Some animals form a close partnership with other kinds of animals. These pairings are called symbiotic (共生的) relationships.

    In a symbiotic relationship, the animals depend on each other. One animal helps the other meet its needs. Sounds good, right? Not always. Some animals are not very kind to their partners. In some cases, one animal meets its needs but hurts its partner. Take ticks, for example. These insects suck blood to live. To get blood, they attach themselves to other kinds of animals. Ticks can pass germs that cause disease instead of helping their hosts.

    In other relationships, animals don't treat their partners so poorly Both animals benefit from living with the other animal.

    Small animals called cleaner shrimps have found a way of helping fish at coral reefs. As their name suggests, the shrimps clean the fish. They hang out at what scientists call a cleaning station. A fish stops by. Then a shrimp climbs onto the fish and even steps into the fish's mouth. The shrimp uses its tiny claws to pick stuff off the fish's body. That can include dead skin, tiny pieces of food, and wee creatures that can hurt the fish. The fish gets a nice cleaning. The shrimp enjoys a tasty meal offish trash.

    Small birds called plovers are also in the cleaning business. They have big customers—crocodiles. Crocs have long snouts（鼻子）filled with sharp teeth, Cleaning them is tricky. When a croc opens its mouth, the plover hops right in. The croc does not snap its snout shut. Instead, it lets the plover eat small, harmful animals attached to its teeth. The plover gets an easy meal while the croc gets clean teeth.

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    It was an autumn morning shortly after my husband and I moved into our first house. Our children were upstairs unpacking, and I was looking out of the window at my father moving around mysteriously on the front lawn. “What are you doing out there?” I called to him.

    He looked up, smiling. “I'm making you a surprise.” I thought it could be just about anything. When we were kids, he always created something surprising for us. Today, however, Dad would say no more, and caught up in the busyness of our new life, I eventually forgot about his surprise.

    Until one gloomy day the next March when I glanced out of the window, I saw a dot of blue across the yard. I headed outside for a closer look. They were crocuses (番红花）throughout the front lawn — blue, yellow and my favorite pink, with little faces moving up and down in the cold wind. I remembered the things Dad secretly planted last autumn. He knew how the darkness and dullness of winter always got me down. What could have been more perfectly timely to my needs?

    My father's crocuses bloomed (开花） each spring for the next five seasons, always bringing the same assurance： Hard times are almost over. Hold on, keep going, and light is coming soon.

    Then a spring came with only half the usual blooms and the next spring there were none. I missed the crocuses, so I would ask Dad to come over and plant new bulbs. But I never did. He died suddenly one October day. My family were in deep sorrow, leaning on our faith.

    On a spring afternoon four years later, I was driving back when I felt depressed. It was Dad's birthday, and I found myself thinking about him. This was not unusual — my family often talked about him, remembering how he lived up to his faith. Suddenly I slowed as I turned into our driveway. I stopped and stared at the lawn. There on the muddy grass with small piles of melting snow, bravely waving in the wind, was one pink crocus.

    How could a flower bloom from a bulb more than 18 years ago, one that hadn't bloomed in over a decade? But there was the crocus. Tears filled my eyes as I realized its significance.

    Hold on, keep going, and light is coming soon. The pink crocus bloomed for only a day, but it built my faith for a lifetime.

    Every so often, mankind comes up with really good inventions that have changed our daily lives. However, the U.S. Patent Office has issued over 7. 5 million patents, and not all of them are quite so celebrated. Some good, some bad, and some crazy! The following lists some of the more unusual ideas that have come along.

    Snake Leash

    In 2002, a patent was issued for a snake-walking leash. There are at least two major problems with this idea.  1) Dog leashes fit securely between the head and shoulders. A snake does not have shoulders; so it might slither away. 2) Dogs are OK for public places because they are social animals, and people like them. Snakes are not OK for public places because they are not social, and some people are terrified of them.

    Stadium Helmet

    Americans are known for our love of sports. Unfortunately, good tickets to games are expensive, and some fans have to sit in the nosebleed sections. This invention, patented in 2000, is designed for these fans.  Featuring a built-in radio, binoculars(望远镜) , a cooling fan,  and a helmet for falling litter, this design transforms the stadium experience.

    Bacon Alarm Clock

    When you think about it, waking to the dreadful, blaring noise of an alarm clock is a terrible way to start the day. However; this clock could change that. You simply put a piece of frozen bacon in the alarm clock, set the alarm, and go to sleep. The clock gently wakes you up with the mouthwatering smell of bacon the next morning, just like waking up on a Sunday morning to the smell of Mom cooking breakfast. Who said there's no time to eat breakfast?

    Toilet Lock

    In 1969, a patent was issued for a really bad idea – the toilet seat lock. First of all, fishing for your keys when you have to go seems very unpleasant. Then there is the possibility of losing the key altogether. What about guests? Just think that you would have to ask permission for the bathroom. Of course, there is the ultimate question: Why would you lock it in the first place?

    Humana Bird Feeder

    People have always admired the gracefulness and beauty of birds, and bird watching is a popular hobby. Unfortunately, getting up close and personal is a challenge. That is, until now.  In 1999, a patent was issued for a helmet with birdfeeders attached to it. Although there may be a design flaw (缺陷) (turning the head to see the birds would probably frighten them), this invention could change the way of bird watching.

    There is some unwelcome news for students preparing for exams and officers putting in long hours—you don't need that "refreshment（提神） break" as much as you may think.

    Scientists believed it was not easy for people to continue their work if they felt the need to have a snack or a rest to make them feel better. They argued that the only way to regain willpower is by supplying more energy to our bodies with rest, food or entertainment.

    But psychologists have challenged this theory, saying weak willpower is in your head. They found that a person's mindset(理念) and belief about willpower determine how long and how well they'll be able to work on a tough mental exercise. "If you think of willpower as something that's limited, you're more likely to be tired when you perform a difficult task," said Professor Veronika Job. "But if you think of willpower as something that is not easily depleted, you can go on and on."

    The researchers led by Mr. Job designed an experiment to test the students' beliefs about willpower. After a tiring task those who believed or were led to believe that willpower was a limited resource performed worse on standard concentration tests than those who thought of willpower as something they had more control over.

    Mr. Job said, "Students who may already have trouble studying are being told that their powers of concentration are limited, and they need to take frequent breaks. But a belief in willpower as a non-limited resource makes people stronger in their ability to work through challenges."

    The findings could help people who are battling with temptation(诱惑): people following strict diets and doing exercise regularly to lose weight, people trying to overcome addictions, employees facing a tight deadline. Willpower isn't driven by a biologically based process as much as we used to think.

    Two Chinese-themed films -- "Go Back to China" and "Baby" -- will be screened at the 20th annual Newport Beach Film Festival (NBFF) this week.

    The film "Go Back to China," written and directed by Chinese American filmmaker Emily Ting, tells the story of fashionista, Sasha Li, a spoiled rich girl living in the United States, who burns through her trust fund (信托基金) and is forced to return to China to work for the family toy business. The second Chinese film, "Baby" was directed by Liu Jie and produced by Shan Gao, and will be on its first show at China Onscreen Biennial. In the film, a Chinese girl, Jiang Meng, who is a lowly cleaner working in a children's hospital, swears to save a baby born with the same congenital defects(先天性缺陷) she was born with, whose father has abandoned it as too expensive to treat.

    Running from April 25 to May 2, the Newport Beach Film Festival boasts over 60 narrative films and over 200 shorts in its line-up this year. These films and shorts are carefully selected by many countries which includes China, Chile, Ireland, South Korea, Europe, Japan, South America and Australia. Film fans are invited to attend the Pacific Rim Showcase Party this Wednesday, honoring the best in Chinese, Asian and Australian filmmaking.

    NBFF Executive Director, Gregg Schwenk, said of the festival," This year, the theme is the Power of Ideas. We've always focused on diverse, strong filmmaking, and we're most proud of how we've been embraced, not just by our audience, but by the filmmaking community."