More cycling, better public transport and car bans… Places all over the world are taking a range of measures to lower traffic pollution.

Paris

    Paris bans cars in many historic central districts on weekends, places odd-even(单双日制的) bans on vehicles, makes public transport free during major pollution events and encourages car-sharing programs. A long section of the right bank of the river. Seine is now car-free and a monthly ban on cars has come into force along the Champs-Elysees.

The Netherlands

    Politicians want to ban the sale of all petrol cars from 2025, allowing only electric of hydrogen vehicles. The new law will allow anyone who already owns a petrol car to continue using it. Most cities encourage bicycle use.

Freiburg

    Freiburg in Germany has 500km of bike routes and a cheap and efficient public transport system. One town, Vauban, forbids people to park near homes and makes car-owners pay 18,000 for a space on the edge of town. In return for living without a car, people are offered cheaper housing, free public transport, and plentiful bicycle spaces.

Curitiba

    The southern Brazilian city of two million people has one of the biggest and lowest-cost bus systems in the world. Nearly 70% of its people go to work by public transport and the result is pollution-free air and traffic-free streets.

Copenhagen

    Copenhagen prioritizes(优先考虑) bikes over cars and now has more cycles than people. The city calculates that one mile on a bike is worth $0.42 to society, while one mile in a car is a $0.2 loss. Large parts of the Danish capital have been closed to vehicles for decades.

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    Early birds-people who feel most energetic in the morning-tend to make healthier food choices throughout the day than night owls(夜猫子) , according to a new study.

    "Evening types had more irregular meal times," notes study author Mirkka Maukonen, studying human nutrition and obesity(肥胖) in Finland.

    Her study focused on people's risk of heart disease and their eating habits. Participants described when and what they had eaten during the past two days.

Maukonen's team then looked at l,854 people's lifestyle. After analyzing the data, the researchers found that both morning and evening people consumed approximately the same number of calories over a whole day.  However, night owls tended to eat their meals later than early birds. Before 10:00 am, night owls consumed less food than early birds. More of their calories came from sugar. After 8:00 pm, the night owls ate more sugar and fat. Meanwhile ,early birds ate more protein during both the morning and the evening hours.

    "Night owls tend to be less healthy than early risers," notes Courtney Peterson who studies diet and meal timing. "They are more likely to get heart disease or cancer. The fact that night owls tend to eat more junk food probably plays a role," Peterson says. "Other factors(因素) also can ruin a night owl's health. Night owls generally sleep worse," says Peterson. "Poor sleep has been linked to unhealthy food choices. "

    Peterson and Maukonen say night owls tend to have poor eating habits. But that doesn't necessarily mean that being a night owl makes a person a poor eater. It could be the reverse- eating poorly could affect people's sleep habits.

"The new findings should serve as a wake-up call to night owls. For them, the new results should encourage paying attention to healthier lifestyle choices," says Maukonen. 28. How did Maukonen do research about people's risk of heart disease?

    Volunteering abroad is a great way to help others, improve your skills and become a more confident, independent person. If you are interested in volunteering abroad, here are some places to go.

    Australia

    If you seek a life on the beach, in a great climate with friendly people, Australia might be your best bet. With thousands of volunteers already signing up to leave for Australia during the holidays, it will be a very popular option.

    Brazil

    This vast country has some great opportunities on offer and is especially popular this year. A lot of volunteer work is available in Brazil centers on conservation and ecological projects. With the world's largest rainforest in Brazil, of which huge part is in danger, there are lots of different jobs you can do.

    Kenya

    Kenya is the destination for those seeking an African experience. Generally volunteers in Kenya work in orphanages(孤儿院)or with local children living in slums(贫民窟). There is a great demand for volunteers in Africa because many people live in poverty, so if you truly feel like making a difference to a community, Kenya should be at the top of your list.

    Costa Rica

    Golden sandy beaches, clear coastlines and beautiful cities are what Costa Rica is all about. Because of its small size, you can see a lot of the country in just a short time. You can really make the most of your time as a volunteer. A lot of work is needed with wildlife and ecological work, so if you want to look after turtles on the beach, Costa Rica could be just the place for you

    Last year, three experienced storm chasers were killed in a tornado(龙卷风)in the US, but despite this the number of people going in search of tornadoes is growing. What drives them to take risks and look for danger? The man at the wheel glanced in the back-view mirror and then slowly turned around. "Don't put this in your program." he said. His wife in the passenger seat laughed. He lowered the window and killed the engine. The wind rushed in from surrounding wheat fields.

    Then, from behind, the sound of footsteps approached on the dirt road. It was a moment of peace after hours of speedy racing through the American grassland. There had been excited shouts about where a tornado might form and how we would be there if it did. We were crazy on the trail a moment ago. But now, everyone was very cool. A Kansas state trooper(骑警) introduced himself through the window. There was pretended surprise when he said how fast we had been going. Really? Wow, sorry.

    Val Cator handed over his driver's license. His wife, Amy, took the registration out of the glove box. Val explained they were storm chasers with Channel 9 News out of Oklahoma City—though it was hardly necessary. Their huge black truck has lightning bolts(闪电)and Storm Tracker 9 painted on the sides.

    Val pointed to the radar on the laptop open next to him and said those red and green dots suggested a tornado could form this afternoon. The state trooper was untouched. "I've got that in my car too." he said. People here keep a close eye on the weather. It's part of living in the tornado alley. Every year some town or other is blown off the map by tornadoes that can reach 300 miles an hour.

    Val and Amy are just two of hundreds of possibly thousands of trackers who speed around with computers and cameras hoping to catch one of these beautiful, deadly storms. I'd joined them to learn why the number of trackers keeps growing. Why are people taking real risks—beyond the steady diet of rest-stop junk food—to watch weather?

    Last year, a tornado killed three of the most experienced storm chasers. It picked up and threw their car as easily as you would a piece of paper. Dozens of other chasers were hurt in the same storm. They were crowded on a few roads when the tornado suddenly expanded and ate them. Val and Amy were there that day but still, in their words, chase aggressively.

    As for old people, some of the applications are hard to use because they didn't grow up with them. They don't have simple models of how they should work, what to do when something doesn't work or where to go for help. We make it as easy as possible to be used for people who are not familiar with the technology.

    I think there is huge potential and we are designing it. The ability to connect to friends, who remember the same movies and news and music, is really important, especially as people get old. They end up in retirement homes and they aren't always close to their friends. Allowing the network to help them connect with friends and family is a really powerful thing.

    My mother is an enthusiastic user of the Internet，although it took me years to get her to use e-mail. She was born with normal hearing, but lost it when she was 3.She was totally deaf for many years, until age 53, when she got ear aids. They work really well. That is a big change for her. But before then, her friends couldn't call her on the phone, so they insisted she use e-mail to communicate with them.

    Young people don't even think of the Internet as technology. It's just there, and they use it. There's been a very interesting change in communications styles between old people and young people. There are some kids who are now in their teens and aren't willing to make phone calls. And they think of e-mail as old-fashioned and slow.

    The reason why teens don't make phone calls seems to be that they don't know what to say. When they call they often stop for a while. They don't know what to say，and there's this silence. On the other hand, texting is considered proper, and it's okay if you don't answer. You might have been distracted. It's not considered rude. But it is considered strange if you're in this kind of voice conversation and simply stop talking.

    If you're a yoga lover, you've probably noticed the ways yoga works — you're sleeping better, getting fewer colds or just feeling more relaxed and at ease. But if you've ever tried telling a beginner how it works, you might find explanations like "It increases the flow of prana" or "It brings energy up your spine" fall on skeptical ears.

    As it happens, Western science is starting to provide some concrete clues about how yoga works to improve health, heal aches and pains, and prevent sicknesses. Once you understand them, you'll have even more motivation to step onto your mat.

    I myself have experienced yoga's healing power in a very real way. Weeks before a trip to India in 2002 to investigate yoga therapy, I developed numbness and tingling (刺痛) in my right hand. After first considering scary things like a brain tumor and multiple sclerosis, I figured out that the cause of the symptoms was thoracic outlet syndrome, a nerve blockage in my neck and chest.

    Despite the uncomfortable symptoms, I realized how useful my condition could be during my trip. While visiting various yoga therapy centers, I would submit myself for evaluation and treatment by the various experts, try their suggestions and see what worked for me.

    Thanks to the techniques I learned in India, advice from teachers in the United States, and my own exploration, my chest is more flexible than it was, my posture has improved, and for more than a year, I've been free of symptoms.

    My experience inspired me to dig into the scientific studies that I'd collected in India as well as the West to identify and explain how yoga can both prevent disease and help you recover from it.