If humans were truly at home under the light of the moon and stars, we would go in darkness happily, the midnight world as visible to us as it is to the vast number of nocturnal(夜间活动的) species on this planet. Instead, we are diurnal creatures, with eyes adapted to living in the sun's light. This is a basic evolutionary fact, even though most of us don't think of ourselves as diurnal beings. Yet it's the only way to explain what we've done to the night: We've engineered it to  receive us by filling it with light.

    The benefits of this kind of engineering come with consequences 一 called light pollution 一 whose effects scientists are only now beginning to study. Light pollution is largely the result of bad  lighting design, which allows artificial light to shine outward and upward into the sky. III-designed lighting washes out the darkness of night and completely changes the light levels 一 and light  rhythms — to which many forms of life, including, ourselves, have adapted. Wherever human light spills into the natural world, some aspect or life is affected.

    In most cities the sky looks as though it has been emptied of stars, leaving behind a vacant haze(霾) that mirrors our fear of the dark. We've grown so used to this orange haze that the original glory of an unlit nigh, - dark enough for the planet Venus to throw shadow on Earth, is wholly beyond our experience, beyond memory almost.

    We've lit up the night as if it were an unoccupied country, when nothing could be further form the truth. Among mammals alone, the number of nocturnal species is astonishing, Light is a powerful biological force, and on many species it acts as a magnet(磁铁). The effect is so powerful that scientists speak of songbirds and seabirds being “captured” by searchlights on land or by the light from gas flares on marine oil platforms. Migrating at night, birds tend to collide with brightly lit tall buildings.

    Frogs living near brightly lit highways suffer nocturnal light levels that are as much as a million times righter than normal, throwing nearly every aspect of their behavior out of joint including most other creatures ,we do need darkness. Darkness is as essential to our biological welfare, to our internal clockwork, as light itself.

    Living in a glare of our making,we have cut ourselves off from our evolutionary and cultural heritage—the light of the stars and the rhythms of day and night .In a very real sense light pollution causes us to lose sight of our true place in the universe, to forget the scale of our being, which is best measured against the dimensions of a deep night with the Milky Way—the edge of our galaxy arching overhead.

    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.

    You are sitting on the desk. A teacher is writing on the blackboard. Kids are yelling in the playground outside. A book falls off the desk next to you. Suddenly, the teacher hands you a pop quiz.

Don't panic! {#blank#}1{#/blank#} You're in a “virtual（虚拟的）classroom”. Everything you see and hear is coming to you through a computer-operated display that you're wearing on your head like a pair of very big glasses. Wearing this kind of virtual-reality equipment, you can find yourself sitting in a classroom, touring a famous museum, wandering across a strange landscape, flying into space, or playing with a cartoon character. {#blank#}2{#/blank#} Virtual-reality equipment that delivers images and sounds directly to your eyes and ears makes these fake worlds seem lifelike.

Unlike the classroom, the technology is real. It's a type of technology that uses computer programs to imitate real world situation.{#blank#}3{#/blank#} Movie directors and video game producers have been using computers for years to create ever more realistic special effects. Some companies are now building three-dimensional（三维）fantasy worlds in which players, linked by computer networks, appear to meet and go on explorations together.

    {#blank#}4{#/blank#} They see virtual reality technology as a useful tool for learning more about why people act as they do. It could help psychologists deter identify and come up with solutions for behaviors problems, for example.

“We've spent the last 100 years looking for certain laws in how people interact with the real world,” says psychologist Albert. “ {#blank#}5{#/blank#} This is psychologist's dream.”

Need a Job This Summer?

    The provincial government and its partners offer many programs to help students find summer jobs. The deadlines and what you need to apply depend on the program.

    Not a student? Go to the government website to learn about programs and online tools available to help people under 30 build skills, find a job or start businesses all year round.

    Jobs for Youth

    If you are a teenager living in certain parts of the province, you could be eligible(符合条件)for this program. Which provides eight weeks of paid employment along with training.

    Who is eligible: Youth 15-18 years old in select communities(社区).

    Summer Company

    Summer Company provides students with hands-on business training and awards of up to $3,000 to start and run their own summer businesses.

    Who is eligible: Students aged 15-29, returning to school in the fall.

    Stewardship Youth Ranger Program

    You could apply to be a Stewardship Youth Ranger and work on local natural resource management projects for eight weeks this summer.

    Who is eligible: Students aged 16 or 17 at time of hire, but not turning 18 before December 31 this year.

    Summer Employment Opportunities(机会)

    Through the Summer Employment Opportunities program, students are hired each year in a variety of summer positions across the Provincial Public Service, its related agencies and community groups.

    Who is eligible: Students aged 15 or older. Some positions require students to be 15 to 24 or up to 29 for persons with a disability.

    You've heard the old advice that skipping meals is a sure-fire way to ruin a weight loss plan, but a new study presented this week at the annual Obesity Society Meeting in New Orleans suggests that perhaps we've overlooked the benefits of selective fasting. According to the research, eating during a smaller window of time each day and skipping your evening meal could have a positive health effect.

    The study concluded that overweight individuals who ate during the day and fasted during the evening reported fewer hunger swings and burned more fat at night, WebMD reported. However, although this diet plan results in more fat burned in the evenings, it did not seem to increase fat burning overall. Due to this, at this moment it's still unclear as to how this eating schedule can affect general weight loss.

    "At this point, we are not sure whether or not total fat burning is increased," study lead author Courtney Peterson told Medical Daily in a recent email." We will need to do a larger study to find out for certain whether or not time-restricted feeding improves fat burning."

    Still, although the results do not indicate a clear association between nighttime fasting and weight loss, they are still important for the world of nutrition. For example, Peterson told Medical Daily that she was surprised to find that participants did not report being hungrier than average, or have above-average swings in hunger levels, despite fasting daily for 18 hours.

    "So we overturned the belief that fasting for longer period each day when the same number of total calories are eaten makes a person hungrier, "wrote Peterson.

    While the effects of fasting and time-restricted feeding have been studied and proven to work in a rodent(贴齿动物)model, research on human subjects is still in its early stages. For this reason, Peterson explained that it is far too early to say, with factual evidence as backing, that time-restricted feeding will improve weight loss in humans. Still, Peterson explained that practicing this eating behavior does have obvious benefits, such as reducing overall food intake, and suggested that practicing time restricted eating a few times a week could be both practicable and healthy.

    "It could be used for short-term goals or longer-term goals，"concluded Peterson." As far as we know，it is safe for adults，although pregnant women and children should not try it."

    Here's the bad news: Men are hurting, and, according to many researchers. masculinity (男子气) is what is hurting them and making it hard for them to maintain friendships. Society tells men to hide their feelings and expects them to be aggressive, so many men lose their friendship when growing up. The good news is that those skills can be recovered!

    There are a lot of experts who can help. and here's what they recommend:

    ⒈Accept your own desire and normalize it for the people in your life. Way, an expert, recommends sharing articles about masculinity and friendship so that you can start these conversations! Concentrate on them and don't forget you have the entire Internet at your fingertips, friend!

    ⒉Model vulnerability. Say the thing that frightens or worries you. like "I'm afraid nobody will go to my party," or "I miss my grandma every day." Doing so will make it easier for other people to follow your lead. We are all on the elevator to a society where emotional availability is normalized, and I want you to press "door open".

    ⒊Ask more questions. People sometimes feel they might be prying (爱打听的) if they ask someone about themselves-especially when their friend is sharing something tough. But if you get curious in moments of vulnerability you will open the door to all kinds of growth in your relationship. Take the opportunity to really see your friend and show them they matter by following up.

    ⒋Get close with the children in your life. Way's research says that the top priority that helps children (especially boys) grow up to have enriching friendships is to be close with an adult relative who was not afraid to express emotions. So. if you are a father. stepfather. or thinking about becoming one. or if you have nieces or nephews, take the opportunity to be close to them and help them grow up to be good friends, too.