People aren't walking any more—if they can figure out a way to avoid it.

    I felt superior about this matter until the other day I took my car to mail a small parcel. The journey is a matter of 281 steps. But I used the car. And I wasn't in any hurry, either, I had merely become one more victim of a national sickness: motorosis.

    It is an illness to which I had thought myself immune（免疫的）, for I was bred in the tradition of going to places on my own two legs. At that time, we regarded 25 miles as good day's walk and the ability to cover such a distance in ten hours as sign of strength and skill. It did not occur to us that walking was a hardship. And the effect was lasting. When I was 45 years old I raced—and beat—a teenage football player the 168 steps up the Stature of Liberty.

    Such enterprises today are regarded by many middle-aged persons as bad for the heart. But a well-known British physician, Sir Adolphe Abrhams, pointed out recently that hearts and bodies need proper exercises. A person who avoids exercise is more likely to have illnesses than one who exercises regularly. And walking is an ideal form of exercise—the most familiar and natural of all.

    It was Henry Thoreau who showed mankind the richness of going on foot. The man walking can learn the trees, flower, insects, birds and animals, the significance of seasons, the very feel of himself as a living creature in a living world, He cannot learn in a car.

    The car is a convenient means of transport, but we have made it our way of life. Many people don't dare to approach Nature any more; to them the world they were born to enjoy is all threat.To them security is a steel river thundering on a concrete road. And much of their thinking takes place while waiting for the traffic light to turn green.

    I say that the green of forests is the mind's best light. And none but the man on foot can evaluate what is basic and everlasting.

    Ever since it was created 30 years ago, The Simpsons, the longest running prime-time (黄金时段) TV show in the country, has become part of US life. So when TV critics Alan Sepinwall and Matt Zoller Seitz ranked the 100 greatest comedies and dramas broadcast in the US, it came as no surprise that The Simpsons was their top choice.

    This was the show that changed the very concept (概念) of cartoons in Western society. Before it appeared, cartoons were considered a way to learn and have fun, not serious adult entertainment. The Simpsons changed this. The genius (过人之处) of the show is that it has something to offer both adults and children.

    It's a hugely entertaining program that's also full of satire (讽刺) and clever humor. A remark by Chitra Ramaswamy in The Guardian gave a sense of the esteem (敬重) in which The Simpsons is held: “Nothing before or since has matched its capacity to be at once so profoundly (深刻地) clever and so unbelievably stupid.”

    The show's creator Matt Groening, and the brilliant team that work with him, make fun of the US government, social customs, and of course, the idea of family life. But unlike classic US prime-time TV characters, the Simpsons are a dysfunctional (功能失调的) family.

    Bart, the boy, is always in trouble – both at home and at school. That may be in part because of his paternal (父亲的) example. Homer Simpson, perhaps the most iconic character, is a beer-swilling (喝着啤酒的), overweight slob (懒汉) who is normally found in front of the TV. And Marge, Homer's wife and the mother of the family, spends most of her time cooking, cleaning or trying to fix the messes that Bart and Homer make.

    The smartest member of the family is daughter Lisa, who excels (表现卓越) at school but is no goody-goody (讨好卖乖的人): Lisa never misses an opportunity to challenge authority. The youngest member of the family is baby Maggie, who will likely be as much a trouble as her brother and sister when she grows up – if she ever grows up, that is.

    But although the Simpsons are a problem family, viewers are always on their side. One of the reasons the show has remained so popular all these years is that the characters are so likeable. Millions of us identify with (同情) them. They are a working class family struggling to make ends meet. They aren't perfect, but then, who is? And after 30 years, this is still what strikes a chord (引起共鸣) with millions of viewers worldwide.

On an autumn afternoon, a remote sheep farm in southern Greenland is quiet. The silence is abruptly broken when dozens of sheep come thundering across the hills overlooking the farm. Walking after them are Lars Nielsen and his 37-year-old son Kunuk Nielsen.

The Nielsen family has owned and run the farm since 1972. Kunuk says the summers now are longer than when he was a child and that drought has become a problem. The fields are not so green as those in the old days. He has to buy hay (草料) from European countries.

The effects of a warming climate are obvious on the land. While he intends to struggle on, his older brother Pilu has chosen a different path.

Pilu, 40, lives in Qaqortoq in the south of Greenland -- a town of about 3,000 people. Ten years ago, he got his helicopter pilot's license and is now part owner of a small company called Sermeq Helicopters. It caters to construction and telecommunication workers and an increasing number of foreign tourists.

Pilu says he loves his family's sheep farm. But he saw that warming temperatures were making remote areas of Greenland more accessible and wanted to look for other opportunities. His company's most popular tours include a visit to Greenland's glaciers.

The warming temperatures are also affecting traditional ways of life, particularly hunting. The sea ice is changing; it's becoming less so that hunting on ice becomes more difficult. When there's no sea ice, it's difficult to use dog sledges (雪橇), and the whole culture around having dogs and dog sledges and doing traditional hunting on the ice is sort of diminishing.

Besides, many Greenlanders, like Pilu, are leaving the countryside for towns and the capital city Nuuk, where opportunities are greater. A report found that Nuuk's share of Greenland's population grew from 17.2% in 1977 to 29.2% in 2014. If there were enough houses in Nuuk, the share would even be bigger.

In early February 2019, 51-year-old Rainer Schimpf and his team set out to film South Africa's famous Sardine Run off the coast of Port Elizabeth. The migration of billions of South African sardines, is a big draw for hunters, especially seabirds and dolphins. The two species work together to herd the large group of fish into smaller shoals (浅滩), which are then eaten by not just the birds and the dolphins, but also sharks and Bryde's whales.

In an attempt to find the best scene of the amazing natural phenomenon, which has been the subject of many films, Rainer got into the middle of a swirling ball of fish. Suddenly the sea churned (翻腾), and the experienced diver and his photographer Heinz Toperczer, who was filming from the boat, instantly realized something strange was going on.

Toperczer later said, "As Rainer moved towards the shoals, suddenly the water churned widely up, dolphins shot out of the water and then a whale appeared and caught him!"

Rainer, who was swallowed in darkness inside the whale's mouth, was trying to survive. "I held my breath because I thought he was going to dive down and release me much deeper in the ocean," the diver said.

Fortunately for Rainer, the whale quickly realized he was no sardine! "I felt huge pressure around my waist (腰部) which is when I guess the whale realized his mistake," he said. "As the whale turned sideways, he opened his mouth slightly to release me, and I was washed out, together with tons of water, of his mouth." Though the entire event lasted just 1. 8 seconds, it felt like a century to Rainer.

Still holding his underwater camera, the diver swam to his boat, where he was quickly rescued by the members of the team. The terrifying adventure did not worry Rainer for too long. After checking to ensure he had no injuries, the diver returned to the water. Fortunately, the rest of the adventure went peacefully.

For a number of Indians who for over half a century have replayed a race again and again, Milkha Singh's 400 metres final run at the Rome Olympics should be among the greatest heartbreaks in global sporting history. In fact, they hoped it would throw up a different result.

However, continued praise for the man decades later is due to the effort by India's greatest track athlete on that September day in the Italian capital, though he still missed out on becoming India's first Olympic track medallist.

As he was growing up, he used to run barefoot daily on hot sand to school, which was situated 20 kilometres from his house. He thinks this was good training but knows it is not possible to ask children to do this today. However, he does feel that the early identification of talented athletes is also important for India's athletic teams to shine.

India has in the last few years judged success purely in terms of medals, but looking into the past reveals how a more generous generation saluted Milkha as a pioneer. Milkha is India's finest track athlete of all time. He remains the only Indian male to win an individual Commonwealth Games athletics gold—he won the 400 metres at Cardiff in 1958，the first athlete from independent India to do so.

Since retiring from athletics, the former champion athlete has set up the Milkha Singh Charitable Trust, which helps poorer families survive if an athlete in their family has died. A percentage of the profits from the film Bhaag Milkha Bhaag are going to his trust.

Finally, let's read a quote from Milkha himself: "There is no shortcut to success." A scene in the film shows Milkha Singh running with injured feet—this actually happened. "I haven't found an alternative to hard work. You need to be patient, dedicated and true to yourself and your work."

More and more teenagers are becoming unwilling to exercise worldwide. Australia, a nation that prides itself on its outdoor culture, is doing particularly poorly. It is currently ranked (排名) 140th out of 146 countries for teenage exercise levels. The data shows that 85%of girls are physically inactive compared to 78% of boys. In Australia, less than 1 in 10 teenagers aged 12 to 18 are meeting the recommended levels of physical activity. 

The current guidelines and evidence show that teenagers should be doing at least 60 minutes of physical activity per day. This should include muscle and bone strengthening activities on at least three days per week, meanwhile limiting recreational screen time to a maximum of 2 hours per day. 

Not being active can cause a range of health conditions leading to early adulthood and beyond. Adolescents may have decreased bone and cardio-metabolic (心脏代谢的) health which leaves them facing an increased risk of chronic disease (慢性病) in later life, including type 2 diabetes, heart disease, high cholesterol, and decreased fitness. If you're not moving enough you're also at an increased risk of being overweight or obese, with data already showing that 29.8% of teenagers (14-17) are classified as overweight or obese. 

So how can we get teenagers to exercise more? Firstly, high schools should place more importance on lunchtime and allow 1-hour breaks that increase physical activity. We should also encourage teenagers to be active on their lunch break. Parents and guardians also have an important role to play and should aim to devote 1 hour a day to moving more. This does not need to be 1 full hour and can be broken down into two 30-minute parts. The most important factor is to identify your teenager's interests and needs surrounding their physical activity.

Don't be afraid to ask for help in finding a safe and fun exercise program. A qualified exercise physiologist or exercise scientist can help your child find a way to be more active that is suited to their needs, age of development, and interests.