As the population of the planet increases, so does the number of homes, business, parking lots, schools, airports and roadways. All these structures use electricity and need to be lighted. Humans demand light. They want their homes more comfortable and they want their streets safe. The problem is that researchers are finding that all the light is having a negative effect on humans and wildlife as well.

    Less than 10 years ago I drove to a thinly populated section of my own, lay down in the middle of the road and watched an attractive meteor shower(流星雨). If I did that today, I wouldn't be able to see the meteor shower.

    Nowadays scientists are finding light pollution can be almost as bad as carbon dioxide （二氧化碳）pollution. One of the saddest parts of light pollution is that most of it is unnecessary and most of the outdoor light that we use is wasted. One only needs to look at a row of street lights to see how much of the lights shines upwards and lights the sky: a total waste of electricity.

    Additionally, the production of electricity creates pollution by releasing greenhouse gases. This affects the air we breathe and our quality of life.

    Scientists are also studying the effects of light pollution on wildlife. Thousands of birds die each year when they crash into highly lighted buildings, as they become puzzled by the light. It has been long known that tiny baby sea turtles become lost and follow the light on the shore instead of heading towards the sea.

    Fortunately, light pollution is one of the easiest sources of pollution that can be corrected without a negative effect. Following some guidelines and a little searching on Google can give you many ideas on how to reduce your contribution to light pollution.

    Metro Pocket Guide

    Metrorail(地铁)

    Each passenger needs a farecard(车票) to enter and go out.Up to two children under age five may travel free with a paying customer.

    Farecard machines are in every station.Bring small bills because there are no change machines in the stations and farecard machines only provide up to $5 in change.

    Get one day of unlimited Metrorail rides with a One Day Pass. Buy it from a farecard machine in Metro stations. Use it after 9：30 a.m. until closing on weekdays, and all day on weekends and holidays.

    Hours of service

    Open：5 a.m. Monday-Friday, 7 a.m.Saturday-Sunday.

    Close：midnight Sunday-Thursday, 3 a.m. Friday-Saturday.

    Last train times vary. To avoid (避免) missing the last train, please check the last train times posted in stations.

    Metrobus

    When paying with exact change，the fare is $1.35. When paying with a SmarTrip card the fare is $1.25

    Fares for senior/disabled customers

    Senior citizens 65 and older and disabled customers may ride for half the regular fare.On Metrorail and Metrobus，use a senior/disabled farecard or SmarTrip^® card.For more information about buying senior/disabled farecards，SmarTrip^® cards and passes，please visit MetroOpensDoors.com or call 202­637­7000 and 202­637­8000.

Senior citizens and disabled customers can get free guide on how to use proper Metrobus and Metrorail services by calling 202­962­1100.

    Travel tips

    Avoid riding during weekday rush periods—before 9：30 a.m.and between 4 and 6 p.m.

    If you lose something on a bus or train or in a station，please call Lost & Found （失物招领）at 202­962­1195.

    Who do you think was the most important woman of the past 100 years?

    Jane Addams (1860～1935)

    Addams helped the poor and worked for peace. She created shelters, education opportunities and services for people in need. In 1931, Addams became the first American woman to win the Nobel Peace Prize.

    Angela Merkel (1954)

    In 2005, Germans chose Angela Merkel as their first woman head of the country. She once worked as a research scientist until 1989. Then she entered politics and has been widely described as Iron Lady in Germany. She was elected as the most powerful woman by the Times in 2015. As Germany's leader, she has had an effect on the whole world.

    Margaret Thatcher (1925)

    In 1979, Margaret Thatcher became Britain's first woman Prime Minister (首相)．She served until 1990, which made her the first British leader to serve three terms in a row. Because of her high standards and strong will, people called her Britain's Iron Lady.

    Marie Curie (1867～1934)

    Polish­born scientist Marie Curie discovered that some types of metal give off energy called radiation (辐射能). Her research led to new medical treatments and arms. She received the Nobel Prize in Physics in 1903 and in Chemistry in 1911.

    People have understood that kindness is good for the person who receives help. For example, when we give food to a hungry person, he is blessed. However, scientists have recently begun to study the effect kindness has on the person giving it. What they have found is that doing good is good for the doer. Acts of kindness can improve health, help a person reach goals and even add years to a person's life.

    The first study to show the connection between doing good and living a long life was a study on aging. Beginning in 1956, scientists studied a group of married mothers for 30 years. They thought the women with the most children would die first. But the number of children a woman had did not matter. Wealth did not matter. Education did not matter. What did matter was whether they volunteered. Women that volunteered had fewer diseases during their life.

    Many other studies have found the same positive effects. Helping other people improves long-term health. The gains are the same for men, women, old people and the young. Those who volunteered had fewer serious diseases than those who did not volunteer. This included diseases such as heart attack, cancer and stroke.

    Scientists are researching many possible causes. One possible cause is an increase in antibodies （抗体）, which help fight against disease. One study showed the body produces more antibodies after an act of kindness. This increase in antibodies can last nearly an hour after one act of kindness is finished.

    Another one is an increase in a chemical that fights the effects of stress from life. Scientists have found a link between being kind to people and an increase in the chemical oxytocin. Oxytocin is a chemical produced in the brain. It reduces many of the harmful chemicals the body produces under stress.

    Crossing your legs is an extremely common habit; most people don't even notice that they're doing it when they sit down. While you may find it comfortable to sit with one knee crossed over the other, it might be causing health problems that you are not aware of.

    A study published in Blood Pressure Monitoring stated that sitting with your legs crossed can increase your blood pressure. The reason for this is that the blood in your legs has to work against gravity to be pumped back to your heart and that crossing one leg over the other increases resistance(阻力), making it even harder for the blood to circulate. This causes your body to increase your blood pressure to push the blood back to the heart. You won't feel any immediate effects, but repeated, drawn­out increases in blood pressure can cause long­term health problems. So, planning to sit for a long period of time? Don't keep your legs crossed.

    Crossing your legs at the knee can also cause pressure on the major nerve in your leg that passes just below your knee and along the outside of your leg, explains Richard Graves, a medical expert. This pressure can cause numbness and temporary paralysis (麻痹) of some of the muscles in your foot and leg, preventing you from being able to raise your ankle—what we know as that "pins and needles" sensation. While the feeling of discomfort may only last a minute or two, repeatedly crossing your legs until they feel numb can cause permanent nerve damage.

    So next time you sit down, try to get yourself in the habit of sitting with both of your feet on the floor. Not only will it help your posture and stability, but it will also save your health in the long run.

Welcome to Student Voice

    What is it?

    Student Voice aims to promote student engagement and success in Ontario's schools by listening to and learning from students. Student Voice provides you, the students, with a variety of ways to share your ideas with your school, the education community and the ministry about what would help support your engagement in your learning. Student Voice can help you take action to shape your learning environment while you build your skills.

    Check out this video to get an idea of what's changing for Ontario students!

    It all starts with you.

    Speak up! You have a voice and we want to hear what you have to say about your education. Your ideas and actions can make a difference in Ontario's publicly funded education system. We want to help you make your school a place where everyone feels welcome and where you are empowered to speak your mind, get involved and become active citizens and leaders.

    Students told as that you want to:

    ●share your ideas with government on how to strengthen student engagement and make Ontario's publicly funded education system even better.

     ●have a school culture where all students feel and know that they belong.

    ●work as partners with your teachers, and participate in school decisions that will shape your lives and the lives of other students.

    This is your education. Speak up and get involved! Let's all work together to ensure Ontario's publicly funded education system remains among the best in the world.

    Send your comments and ideas to studentvoice@ontario.ca