Transparent animals let light pass through their bodies the same way light passes through a window. These animals typically live between 

the surface of the ocean and a depth of about 3,300 feet—as far as most light can reach. Most of them are extremely delicate and can be 

damaged by a simple touch. Sonke  Johnsen, a scientist in biology, says, “These animals live through their life alone. They never

touch anything unless they're eating it, or unless something is eating them.”

And they are as clear as glass. How does an animal become see-through? It's trickier than you might think.

      The objects around you are visible because they interact with light. Light typically travels in a straight line. But some materials slow and

 scatter(散射) light, bouncing it away from its original path. Others absorb light, stopping it dead in its tracks. Both scattering and absorption

 make an object look different from other objects around it, so you can see it easily.

But a transparent object doesn't absorb or scatter light, at least not very much, Light can pass through it without bending or stopping.

That means a transparent object doesn't look very different from the surrounding air or water. You don't see it —you see the things

behind it.

   To become transparent, an animal needs to keep its body from absorbing or scattering light. Living materials can stop light because they

contain pigments(色素) that absorb specific colors of light. But a transparent animal doesn't have pigments, so its tissues won't absorb

 light. According to  Johnsen, avoiding absorption is actually easy. The real challenge is preventing light from scattering.

Animals are built of many different materials—skin, fat, and more—and light moves through each at a different speed. Every time light

moves into a material with a new speed, it bends and scatters.Transparent animals use different tricks to fight scattering. Some animals are

simply very small or extremely flat. Without much tissue to scatter light, it is easier to be see--through. Others build a large, clear mass of

 non-living jelly-lie(果冻状的)material and spread themselves over it .

    Larger transparent animals have the biggest challenge, because they have to make all the different tissues in their bodies slow down light 

exactly as much as water does. They need to look uniform. But how they're doing it is still unknown. One thing is clear for these larger animals, staying transparent is an active process. When they die, they turn a non-transparent milky white.

SPECIAL EVENTS THIS WEEKEND

Captain Goodfellow

    Do your children enjoy interesting stories, funny games, and exciting dances? Captain Goodfellow will be ready to teach all these things to children of all ages at the City Theatres on Saturday morning at 10:00 . Free.

    Walking Tour of the Town

    Forget your worries on Saturday morning. Take a beautiful walk and learn about local history. Meet at the front entrance of City Hall at 9:30. Wear comfortable shoes!

    Films at the Museum

    Two European films will be shown on Saturday afternoon at the Museum Theatre. See Broken Window at 1:30. The workers will be at 3:45. For further information, call 4987898.

    International Picnic

    Are you tired of eating the same kind of food every day? Come to Central Park on Saturday and enjoy food from all over the world. Delicious and not expensive. Noon to 5:00 p.m.

    Take me out to the Ballgame

    It's October, and tonight is your last chance to see the Redbirds this year. Get your tickets at the gate. It might be cold. Don't forget sweaters and jackets.

    Do you want to hear “The Zoo”?

    “The Zoo”, a popular rock group from Australia, will give their first US concert this year tomorrow night at 8 Rose Hall, City College.

    Our spiritual intelligence quotient(精神智商), or SQ, helps us understand ourselves, and live fuller, happier lives.

    Though we're all born with SQ, most of us don't even realize that we have it. Fortunately, you don't have to sign up for classes to learn how to improve your SQ. Here are some simple steps that can lead you to this new level of understanding.

    Sit Quietly. The process of developing spiritual intelligence begins with solitude(独处) and silence. To tune in to your spirit, you have to turn down the volume(强度) in your busy, noisy, complicated life and force yourself to do nothing at all. Start small by creating islands for silence in your day. In the car, instead of listening to the music, use the time to think. At work, shut the door to your office between meetings, take a few breaths and let them out very, very slowly. Enjoy the stillness in your home after the kids are finally in bed.

    Step Outside. For many people, nature sets their spirit free. Go outside to watch a beautiful sunset. If you are walking with the dog, take the time to admire flowers in bloom; follow the flight of a bird and watch clouds float overhead.

    Ask Questions of Yourself. Ask open-ended questions, such as ‘What am I Feeling? What are my choices? Where am I heading?'

    But don't expect an answer to arrive through some supernatural forms of e-mail. ‘Rarely do I get an immediate answer to my question,' says Reverend Joan Carter, a Presbyterian minister in Sausalito, California. ‘But later that day I suddenly find myself thinking about a problem in a perspective(角度) I never considered before.'

    Trust Your Spirit. While most of us rely on gut(本能的) feeling to realize danger, spiritual intelligence pushes us, not away from, but towards some action that will lead to a greater good.

    Traveling is a very good activity. When you are fed up with your work and are allowed to take a holiday, you can go to the beautiful spots to enjoy the beauty of nature and the special character of other cities. You can breathe fresh air, visit some places of interest, meet different people and make friends with them. Then you will feel fully relaxed and you will have the energy to undertake the new tasks waiting for you.

    But sometimes, traveling is not an enjoyable thing. For example, when the bus or car you take has a bad accident, you may be trapped in it and waste your time. What's more, the weather can be changeable. If you are climbing a mountain, it may rain suddenly. You may be caught in the rain and may catch a cold. The worst thing is that you may have your money stolen and you may have an injury. All these are terrible things that can happen to a tourist.

    Therefore, before going on a trip, you must prepare yourself carefully. Firstly, you must have clear information about the weather. Secondly, you should choose a good companion so that you can help each other. Thirdly, you must be careful everywhere and try to avoid accidents. If you do these, you can enjoy your travels better and reduce unnecessary trouble.

I suspect that the most basic and powerful way to connect to another person is to listen. Perhaps the most important thing we ever give each other is our attention, and especially if it's given from the heart. When people are talking, there's no need to do anything but listen to them. Just take them Just listen to what they're saying and care about it. Most times caring about it is even more important than understanding it. Most of us don't value ourselves or our love enough to know this. It has taken me a long time to believe in the power of the simply saying "I'm so sorry" when someone is in pain, and meaning it.

    One of my patients told me that when she tried to tell her story, people often interrupted to tell her that they had once had something just like that happen to them. Eventually she stopped talking to most people. She was just too lonely. We connect through listening. When we interrupt what someone is saying to let them know that we understand, we move the focus of attention to ourselves. When we listen, they know that we care. Many people with cancer can talk about the relief of having someone just listen.

    I have ever learned to respond to someone crying by just listening. In the old days I used to reach for the tissues(纸巾), until I realized that passing a person a tissue may be just another way to shut them down, to take them out of their experience of sadness and grief. Now I just listen. When they have cried all they need to cry, they find me there with them.

    Broken Wings

    1-4 Aug: Musical adaptation of the poet Kahil Gibran's 1912 masterpiece. Set in New York in 1923, it transports you to turn-of-the-century Beirut.

    7: 30 p. m. (& 2: 30p. m. 4 Aug); Tickets: ￡10-￡96. so.www.trh.co.uk. Theatre Royal Haymarket, Haymarket, SWIY 4HT. T: 020-7930 8800. E7. Station: Piccadilly Circus.

    Chicago the Musical

    Martin Kemp stars as Billy in this jazz musical based on real murder cases which shocked Chicago in the 1920s.

    Mon-Sat 7: 30 p. m.; Wed & Sat 2: 30 p. m. Tickets: ￡25-￡150. www.phoenixtheatrelondon co.uk

    Phoenix Theatre, 110 Charing Cross Rd, WC2HOJP. T: 0843-316 1082. E7. Station: Tottenham Court Road

    Dreamgirls

    Musical about a female singing group from Chicago. Classic songs include I Am Telling You I'm Not Going, I Am Changing, and Listen and One Night Only. Join these friends as they go on a musical rollercoaster ride through a world of fame, fortune and the ruthless realities of show business, testing their friendships to the very limit.

    Mon-Sat 7: 30 p. m.; Wed & Sat 2: 30 p. m. Tickets: ￡15-￡75. www.savoytheatre org. savoy.

    Strand WC2R OET. T: 0844-871 7687. E8. Station: Covent Garden.

    Everybody's Talking about Jamie

    This feel-good musical is set on a council estate in Sheffield, northern England, and tells the story of 16-year-old Jamie and how he overcomes bullies and prejudice. This is inspired by a true bully story.

    Mon-Sat 7: 30 p. m.; Wed & &t 2: 30 p. m. Tickets: ￡20-￡85. www.everybodystalkingaboutjarmie.co.uk

    Apollo Theatre, 31 Shaftesbury Ava WID 7ES T: 0330-333 4809. E7. Station: Piccaddly Circus