【推荐2】A 12-year-old girl, Eleanor Woods, has created a green backpack that filters (过滤) out air pollution. Her innovative bag won the award of the “Backpack to the Future” competition.

The competition was launched to encourage students to combine an interest in fashion with a career in science, technology, engineering or maths.

Powered by green energy from solar power and a dynamo-a machine that converts mechanical energy into electrical energy-the backpack filters polluted air before fanning out cleaner air nearby.

Air pollution was always Eleanor’s concern. Meanwhile, spending a lot of time with her asthmatic (患哮喘病的) mum, Eleanor especially focused on how pollution affects a person’s health and the spread of diseases. “We have an air filter at home because my mum has mild asthma. But what if she wants to go out? It would be inconvenient and dangerous! My Breathe Better Backpack is about keeping those like my mother safe using an air filter. It looks cool and will help get them outside and fight off colds,” Eleanor said.

The girl added, “My generation has really realized pollution, and we have lessons on it at school. This is another reason why I designed this, because we need to do something.”

【推荐1】As we age, even if we’re healthy, the heart just isn’t as efficient in processing oxygen as it used to be. In most people the first signs show up in their 50s or early 60s. And among people who don’t exercise, the changes can start even sooner.

“Think of a rubber band. In the beginning, it is flexible, but put it in a drawer for 20 years and it will become dry and easily broken,” says Dr. Ben Levine, a heart specialist at the University of Texas. That’s what happens to the heart. Fortunately for those in midlife, Levine is finding that even if you haven’t been an enthusiastic exerciser, getting in shape now may help improve your aging heart.

Levine and his research team selected volunteers aged between 45 and 64 who did not exercise much but were otherwise healthy. Participants were randomly divided into two groups. The first group participated in a program of nonaerobic (无氧) exercise—balance training and weight training—three times a week. The second group did high-intensity aerobic exercise under the guidance of a trainer for four or more days a week. After two years, the second group saw remarkable improvements in heart health.

“We took these 50-year-old hearts and turned the clock back to 30-or 35-year-old hearts,” says Levine. “And the reason they got so much stronger and fitter was that their hearts could now fill a lot better and pump (泵送) a lot more blood during exercise.” But the hearts of those who participated in less intense exercise didn’t change, he says.

“The sweet spot in life to start exercising, if you haven’t already, is in late middle age when the heart still has flexibility,” Levine says. “We put healthy 70-year-olds through a yearlong exercise training program, and nothing happened to them at all.”

Dr. Nieca Goldberg, a spokeswoman for the American Heart Association, says Levine’s findings are a great start. But the study was small and needs to be repeated with far larger groups of people to determine exactly which aspects of an exercise routine make the biggest difference.

【推荐2】I’m a walker, logging an average of 9000 steps a day several times a week around my neighborhood. On recent trips to Copenhagen and Stockholm, I noticed tall, fit Scandinavians (斯堪法尼亚人) walking along on city streets with poles, as if they were cross-country skiing without any snow.

It was a surprise to learn that the addition of the poles makes it a more vigorous, full-body exercise than simply walking — and, as a 76-year-old looking to stay healthy while enjoying the outdoors, I decided to give it a try.

There’s plenty of help online for the new Nordic (北欧的) walker: stand tall, swing your arms out as if to shake hands, and plant your poles with vigour. Then there’s the little matter of the strap (带子) on the pole. This allows the walker to grip the pole when thrusting forward and then relax that hand as the other hand pushes forward — a skill of coordination that builds stronger muscles.

For a warm-up, I started slow: Nordic walking down the hall that extends from my front door to the deck. Keeping balance wasn’t my only problem. The novel use of my arms and upper body was surprisingly demanding. After half an hour, my heart was pounding and I was sweating, but I still wasn’t much good.

Still, I carried on because there’s no arguing with the exercise’s benefits. Nordic walkers’ upper-body exercise increases their heart rate significantly more than walking without poles. And according to cardiologist Dr Aaron Baggish, with poles “you’re engaging 80 to 90 per cent of your muscles.” It also helps people with Parkinson’s, says Burrill. “We put poles in their hands and it’s amazing because they start walking with real rhythm.”

After a few clumsy days of being convinced I would never succeed, suddenly everything clicked. Not only was I able to coordinate the movements, I was aware that my heart, arms and core were getting a workout. Nordic walking is a form of exercise I expect to enjoy for years to come.

【推荐1】I was in the middle of the Amazon with my wife, who was there as a medical researcher. We flew on a small plane to a faraway village. We did not speak the local language, did not know the customs, and more often than not, did not entirely recognize the food. We could not have felt more foreign.

We were raised on books and computers, highways and cell phones, but now we were living in a village without running water or electricity It was easy for us to go to sleep at the end of the day feeling a little misunderstood.

Then one perfect Amazonian evening, with monkeys calling from beyond the village green, we played soccer. I am not good at soccer, but that evening it was wonderful. Everyone knew the rules. We all spoke the same language of passes and shots. We understood one another perfectly. As darkness came over the field and the match ended, the goal keeper, Juan, walked over to me and said in a matter-of-fact way, “In your home, do you have a moon too?” I was surprised.

After I explained to Juan that yes, we did have a moon and yes, it was very similar to his, I felt a sort of awe at the possibilities that existed in his world. In Juan’s world, each village could have its own moon. In Juan’s world, the unknown and undiscovered was vast and marvelous. Anything was possible.

In our society, we know that Earth has only one moon. We have looked at our planet from every angle and found all of the wildest things left to find. I can, from my computer at home, pull up satellite images of Juan’s village. There are no more continents and no more moons to search for, little left to discover. At least it seems that way.

Yet, as I thought about Juan’s question, I was not sure how much more we could really rule out. I am, in part, an ant biologist, so my thoughts turned to what we know about insect life and I knew that much in the world of insects remains unknown. How much, though? How ignorant are we? The question of what we know and do not know constantly bothered me.

I began collecting newspaper articles about new species, new monkey, new spider…, and on and on they appear. My drawer quickly filled. I began a second drawer for more general discoveries: new cave system discovered with dozens of nameless species, four hundred species of bacteria found in the human stomach. The second drawer began to fill and as it did I wondered whether there were bigger discoveries out there, not just species, but life that depends on things thought to be useless, life even without DNA. I started a third drawer for these big discoveries. It fills more slowly, but all the same, it fills.

In looking into the stories of biological discovery, I also began to find something else, a collection of scientists, usually brilliant occasionally half-mad, who made the discoveries. Those scientists very often see the same things that other scientists see, but they pay more attention to them, and they focus on them to the point of exhaustion, and at the risk of the ridicule of their peers. In looking for the stories of discovery, I found the stories of these people and how their lives changed our view of the world.

We are repeatedly willing to imagine we have found most of what is left to discover. We used to think that insects were the smallest organisms, and that nothing lived deeper than six hundred meters. Yet, when something new turns up, more often than not, we do not even know its name.

【推荐2】When reading, my mother likes to slice a paragraph or a sentence out and attach it to the wall of her kitchen. She picks boring sentences that puzzle me. But I prefer copying favorite bright lines into a journal in soft, gray No. 2 pencil, word by word.

She doesn’t know any of this. There’s nothing shocking: for our chatting. We seldom begin certain conversations though we talk on the phone weekly, sometimes making each other laugh so hard that I choke and she cries. But what we don’t say could fill up rooms. Fights with my father. Small failures in school. Anything that really upsets us.

My mother has never told me “I love you, Lisa.” — as if the four-word absence explains who I am — so I carry it with me, like a label on me. The last time she almost spoke the words was two years ago, when she called to tell me a friend had been in hospital. I said, “I love you, Mom.” She stopped for a while and then said, “Thank you.” I haven’t said it since, but I’ve wondered why my mother doesn’t until I’ve found a poem that supplies words for the blank spaces I try to understand in our conversations:

Don’t fill up on bread. I say absent-mindedly. The servings here are huge.

My son, middle-aged, says: Did you really just say that to me?

What he doesn’t know is that when we’re walking together, I desire to reach for his hand.

It’s humble, yet heartbreaking. After copying it down in my journal, I emailed it to mom, adding “This poem makes me think of you.” My mother doesn’t read poetry — or at least, she doesn’t tell me, and I felt nervous clicking “Send”.

She never mentioned the poem. But the next time I went home for vacation, I noticed something new in the kitchen fixed to an antique board: the poem. The board hung above the heater, the warmest spot in the kitchen. The poem still hangs there. Neither my mother nor I have ever spoken about it.

【推荐3】As Ginni Bazlinton reached Antarctica, she found herself greeted by a group of little Gentoo penguins (企鹅) longing to say hello. These gentle, lovely gatekeepers welcomed her and kick-started what was to be a trip Ginni would never forget.

Ever since her childhood, Ginni, now 71, has had a deep love for travel. Throughout her career (职业) as a professional dancer, she toured in the UK, but always longed to explore further. When she retired from dancing and her sons eventually flew the nest, she decided it was time to take the plunge.

After taking a degree at Chichester University in Related Arts, Ginni began to travel the world, eventually getting work teaching English in Japan and Chile. And it was in Chile she discovered she could get last-minute cheap deals on ships going to Antarctica from the islands off Tierra del Fuego, the southernmost tip of the South American mainland. “I just decided I wanted to go,” she says. “I had no idea about what I’d find there and I wasn’t nervous, I just wanted to do it. And I wanted to do it alone as I always prefer it that way.”

In March 2008, Ginni boarded a ship with 48 passengers she’d never met before, to begin the journey towards Antarctica. “From seeing the wildlife to witnessing sunrises, the whole experience was amazing. Antarctica left an impression on me that no other place has,” Ginni says. “I remember the first time I saw a humpback whale; it just rose out of the water like some prehistoric creature and I thought it was smiling at us. You could still hear the operatic sounds it was making underwater.”

The realization that this is a precious land, to be respected by humans, was one of the biggest things that hit home to Ginni.