You may think that light pollution isn't something extraordinarily important. You may believe that every other type of pollution has a larger impact on the environment that light pollution does. But light pollution is serious.

    Light pollution, or “sky glow”, is the glow you can see at night above cities and towns. Light pollution is a problem that has been accompanying man ever since he started his first fire some 15,000 years ago. Light pollution is the light that comes from streetlights, buildings, parking lots and any other source of light that is reflected or directed into the atmosphere.

    Urban light pollution means that one-fifth of the world's population can no longer see the Milky Way(银河) with the naked eye(肉眼). Many city kids, even if they did look through the orange smog above their heads, would probably see only a handful of stars. We have lost our view of the stars, and we have mucked up our  night-time environment as well. Astronomers are calling for the dark places on Earth to be preserved as national parks.

    Lots of people find the ever-brightening night annoying, and animals that are programmed to prefer the dark may avoid a brightened habitat. Sea turtles can get lost searching for a beach to lay eggs, and their hatchlings(孵化的幼仔)may confuse over-lit beachfront resorts(度假胜地) for the ocean horizon, wasting precious energy needed to find the sea and escape predators(食肉动物). Because their necks aren't yet long enough to see things far away, baby turtles rely on the mirror image of the moon to guide them to the sea, to begin their new life. A car may even hit a particular turtle, which was thinking the light from a nearby city was moonlight reflecting off the ocean waves. Birds that live in and around cities can die because of sky glow, too. The bright lights can blind them, leading to countless collisions with buildings and other tall structures.

    On an individual level, people can help reduce much sky glow by using lighting only when necessary. The stars above us are priceless heritage— for not only for astronomers but for all humans. More of our children should be able to look up at night and see the Milk Way.

    Fear may be felt in the heart as well as in the head, according to a study that has found a link between the cycles of a beating heart and the chance of someone feeling fear.

    Tests on healthy volunteers found that they were more likely to feel a sense of fear at the moment when their hearts are contracting（收缩）and pumping blood around their bodies, compared with the point when the heartbeat is relaxed. Scientists say the results suggest that the heart is able to influence how the brain responds to a fearful event, depending on which point it is at in its regular cycle of contraction and relaxation.

    Sarah Garfinkel at the Brighton and Sussex Medical School said: “Our study shows for the first time that the way in which we deal with fear is different depending on when we see fearful pictures in relation to our heart.”

    The study tested 20 healthy volunteers on their reactions to fear as they were shown pictures of fearful faces. Dr Garfinkel said, “The study showed that fearful faces are better noticed when the heart is pumping than when it is relaxed. Thus our hearts can also affect what we see and what we don't see and guide whether we see fear.”

    To further understand this relationship, the scientists also used a brain scanner（扫描仪）to show how the brain influences the way the heart changes a person's feeling of fear.

    “We have found an important mechanism by which the heart and brain ‘speak' to each other to change our feelings and reduce fear,” Dr Garfinkel said.

    “We hope that by increasing our understanding about how fear is dealt with and ways that it could be reduced, we may be able to develop more successful treatments for anxiety disorders, and also for those who may be suffering from serious stress disorder.”

    Experts generally consider BMI for kids to be a good measure of body fat, at least among heavier children. But in some cases it might be misleading. Athletic kids, in particular, may fall into the overweight category when they are actually muscular.

    Your child's BMI is important, but it is only a piece of the picture. If a BMI percentile (体重指数) indicates that your child is not within the healthy range, she needs a complete weight and lifestyle evaluation with a doctor.

    Experts recommend that kids of all ages and all weight categories follow these healthy guidelines to keep weight in control. It's easy to remember them as “5 — 2 — 1 — 0” every day.

    5 > Everyone in your family needs five servings of vegetables and fruit. Keep serving them even if kids don't eat them. If they see a food over and over, they're more likely to try it in the end.

    2 > Limit TV-watching to no more than 2 hours a day. Family members who use other “screens”—video games or computers, for instance, get less TV time. And kick the TV out of all bedrooms.

    1 > Get 1 hour of physical activity. Add up the minutes each family member is moving —it should be 60 minutes or more for each person. Start small and keep adding if necessary.

    0 > That's how many sugar-sweetened beverages you should have a day. Juice drinks such as lemonade and fruit punch, sodas, tea, and coffee can all have added sugar. Stick to water and reduced-fat milk instead.

    Breakdancing is set to make its first debut (亮相) as an Olympic sport at Paris 2024, Tony Estanguet, head of the Paris organizing committee, said on February 21st. Skateboarding, sport climbing and surfing, which have already been added to the programme for the 2020 Tokyo Olympics, have been invited to return in Paris four years later.

    Tony Estanguet said the choices responded to a need to make the Olympics "more urban" and "more artistic". We have chosen to present the International Olympic Committee (IOC) with the four sports because they are creative, appealing to youth and completely in line with our vision. They reflect perfectly Paris 2024's identity.

    Breakdancing is an example of a sport "Which can be played anywhere and anytime in urban and other environment." It appeared at the 2018 Youth Olympics in Buenos Aires in the form of head-to-head "battles". In competitive breakdancing, "breakers" face off in "battles" against each other, either as individuals or teams. Breakdancers use a mix of physical and artistic skills combining elements from gymnastics or acrobatics (杂技).

    The IOC had announced that the number of competitors at Paris 2024 would be restricted to 10, 500, which limited the opportunity to add sports. But the organizers said the inclusion of the four sports in Paris would not necessitate the construction of permanent facilities and would involve just 248 competitors, of which 32 would he in breakdancing. The surfing events are likely to be held in established surf centres such as Biarritz or Lacanau in southwest France.

    The inclusion still need to be rubberstamped by the IOC, which is expected to decide on which sports to add in Paris after next years' Tokyo Games.

    I waited half an hour, set the board, and sat in the studio, reviewing my questions until the telephone lines flashed.

    "Hello?"

    "This is Connie Chung. I'm so sorry I'm late."

    Connie Chung was one of the only four women anchors（主播）to make it into the club of major evening network television news. For almost an hour we talked about the industry. When I asked if she ever had an instructor throughout her trials, she turned around and offered to instruct me. When I asked why she decided to do it, she simply replied, "Because you're good."

    That afternoon I rushed home and told my mother what had happened. Without looking up, she just said "Good for you." Hearing this, I felt a sense of loss.  Her consistent response always made me feel under-appreciated.

    Until then I had been searching for something that I would never get—that sense of love and acceptance in a house full of negativity（消极）.

    I knew I needed to get rid of all the negativity in my life first, so I packed my bags and walked out of the house, thinking a risk would allow me to open myself to the world again and receive all the positive energy that I needed.

    Then radio became my way of connecting with others. My ability to book high-level guests and celebrities（名人）was gradually recognized and eventually all the words of encouragement from past guests and colleagues helped me to re-build my confidence levels. "I can do this," I kept telling myself, and pushed even harder to find my next aim.

    People had faith in me, so I developed faith in myself. Their positive attitudes towards themselves and towards me helped me develop my own positive attitude, leading to productive interactions with celebrities and adding to my list of instructors.

    I may not have started life surrounded by positivity but I surely feel that I am surrounded by it now. It's amazing how positivity builds on itself.

    Whatsonstage.com is the UK's biggest and best online guide to the performing arts including theatre, opera, classical music, dance and so on.

    The Lion King

    Musical: The stage adaptation of the Disney film taken from an original African story. A young lion grows up and learns that taking over the pride requires wisdom and maturity(成熟).

    Place: Lyceum Theatre, Wellington Street, London

    Telephone: 0870 243 9000

    Date: Friday, 18 Nov. 2015

    Ticket price: ￡37.5

    Oliver

    Musical: Dickens' story of a boy in a London workhouse and his adventures on the way to discovering his family. The songs include Food glorious food, You've got to pick a pocket or two, Who will buy this wonderful morning, I am reviewing the situation and Consider yourself at home.

    Place: Theatre Royal, Catherine Street, London

    Telephone: 020 7494 5061

    Date: Thursday, 17 Nov. 2015

    Ticket price: ￡25,but now save 20%

    Jersey Boys

    Musical: It tells the story of Frankie Valli and the Four seasons: the blue-collar kids from New Jersey formed a singing group and became famous. The musical features many of the group's popular songs such as Big girls don't cry, Oh, what a night and Can't take my eyes off you.

    Place: Prince Edward Theatre, Old Compton Street, London

Telephone: 0870 850 9191 —

    Date: Saturday, 19 Nov. 2015

    Ticket price: ￡22.5

    Alls Well That Ends Well

    Play: A romantic story. Helena, daughter of a poor physician, loves Bertram, son of a Countess(女伯爵).

    Place: Shakespeare's Globe Theatre, Park Street, London

    Telephone: 020 7401 9919

    Date: Sunday, 20 Nov, 2015

    Ticket price: ￡40.5