1 . If all goes well, a balloonwill soon rise from Esrange Space Center in Kiruna, Sweden. It will float highinto the upper atmosphere and then return to Earth. However, environmentalists have arrived to stop this from happening.

The campaigners are against the balloon because of what occurs in flight. The balloon will shoot dust into the Earths upper atmosphere, causing more sunlight to reflect back into space. The dust, known as stratospheric aerosolinjection(SAI), is part of a solar geoengineering (地球工程) program named SCoPex which is being conducted by Harvard University. The aim of the program is to purposely change the Earth's atmosphere to fight climate change.

Those who oppose worry about two things. Firstly, the moral risk-if solar geoengineering works, talks on reducing greenhouse gases will be challenged. The second concern is the amount of SAI in the atmosphere. To keep temperatures low, the need of the reflective dust tobel released high above Earth will be endless, and a sudden stop could result in rapid warming. Raymond Pierrehumbert, a physicist at Oxford University, says solar geoengineering is even tool risky to research beyond computer models.

Not all environmentalists are opposed to it. Since the world is unlikely to achieve the 1. 5 ℃ global warming target set in the Paris Agreement, some green organizations favour small-sized geoengineering research.

Regardless of the criticism, the research continues. Geoengineering is increasingly gaining international attention. A recent report about climate change suggested that SAI could help keep warming below 1. 5℃. The National Academy of Sciences, Engineering and Medicine in the USA has developed a research plan for solar geoengineering and received governmental funding totaling $9 million. Both China and India have also launched research programmes of their own. Activists may oppose the experiments, but balloons will likely fly anyway.

3 . Jean was a single mother with a young son. She taught the first grade and worked very hard. She drove a small old car. One August, the teachers returned from a summer break to see Jean drive up to school with three children. The two girls were Jean’s former students who had lost their parents. They did not want to enter a foster care center. They turned to Jean-their first grade teacher-for help. Though she and her son lived in a small house, Jean took the girls in.

During lunch, while other teachers shared life stories, Jean never complained about her new responsibilities. She did, however, speak about her car. With three children to transport, the car was too small and slow. It even burned engine oil. Jean needed something new. However, she couldn’t buy one with three children in her home.

As a good friend, I listened to her concerns. At that time, I did not have much money. But I wanted to help Jean buy a car. An idea hit me when I watched a TV show.

One day, Jean received an invitation to a TV show. She was surprised but decided to attend it. Midway through the show the host called Jean to the stage. He explained he had received a letter, knowing her need for a new car. The audience listened to the details of Jean’s story and were all moved. Then the host said that Jean would receive a new car for her family. Cheers filled the studio and Jean shook with disbelief.

Six hundred miles away, I watched the joy of it all from the television in my living room. Jean’s big heart taught me many lessons that year. I did nothing but share her story.

4 . When he was two years old, Ben stopped seeing out of his left eye. His mother took him to the doctor and soon discovered he had cancer in both eyes. After possible treatments failed, doctors removed both his eyes. For Ben, vision was gone forever.

But by the time he was seven years old, he had developed a technique for feeling the world around him: he clicked with his mouth and listened for the returning echoes. This method enabled Ben to determine the locations of open doorways, people, parked cars, garbage cans, and so on. He was echolocating: bouncing his sound waves off objects in the environment and catching the reflections to build a mental model of his surroundings.

Echolocation may sound like an improbable feat for a human, but thousands of blind people have perfected this skill, just like Ben did. The event has been written about since at least the 1940s, when the word ''echolocation" was first invented in a science article titled “Echolocation by Blind Men , Bats, and Radar.”

How could blindness give rise to the amazing ability to understand the surroundings with one's ears? The answer lies in a gift on the brain; huge adaptability.

Mother Nature filled our brains with flexibility to adapt to circumstances. Just as sharp teeth and fast legs are useful for survival, so is the brain's ability to reset, which allows for learning, memory, and die ability to develop new skills.

In Ben's case, his brain's flexible wiring repurposed his visual cortex for processing sound. As a result, Ben had more neurons available to deal with listening information, and this increased processing power allowed Ben to interpret soundwaves in shocking detail. Ben's super-hearing proves a more general rule: the more brain area a particular sense has, the better it performs.

5 . Arguster grew up on his family’s farm in a remote village. Planting cash crop — cotton, they were breaking even and had to make ends meet. In his childhood, there were nine kids at home. All the boys were in one room with two beds. Two slept at the head while two slept at the foot. Therefore, there was one thing about their feet — washing them before crowding onto the bed.

When there was a hole in Arguster’s jeans, his mother would put a patch on it. However, the hole kept going. It was the naughty kids, Arguster included, that took the jeans out, hung them on a line and shot them to put holes. Aware of that, however, Ben, the father, didn’t rebuke them, knowing it might be the only way to bring laughter to his kids.

Arguster’s first lesson in economics was taught by Ben. The childish kid had worked and made a little extra money. He couldn’t help admiring himself, “I make six dollars! Six dollars! Man! I’m on the top of the world!” With a great thrill, Arguster decided to go to fair, where he played games, ate cotton candy... When asked by Ben how much he had spent, with his head down, Arguster replied, “Daddy, I spent it all...” Looking at his messy hair, Ben sighed, “Boy, you spent all your money and haircut’s gone up to 75 cents. I’m afraid...” From then on, Arguster always kept enough money to get himself a haircut.

Ben taught his kids how to do the right thing and wanted them to do the right thing, which Ben tried to pass on to his kids, in his own way. Ben started a syrup mill(糖坊). People in the community brought their cane and millet for Ben to grind up (磨碎) for syrup. When people paid with buckets of syrup, Ben refused. Arguster got confused, “Daddy, why don’t you let these people pay you?”

“Because we got enough syrup to last for a long time! Son, these people don’t have money to pay. That’s the only way they can pay.”

8 . The transatlantic car carrier, Oceanbird, is being designed by Wallenius Marine, a Swedish shipbuilder,with support from the Swedish government.

With a capacity(容量) of 7,000 vehicles, the 650 foot-long vessel will have a similar size to ordinary car carriers, but it will look totally different. The ship will have five “wing sails”, with each being 260 feet tall. These sails are capable of turning 360 degrees, and it can be shortened to 195 feet in order to pass under bridges or withstand rough weather.

Although the general theory of wing sails is not new, designing the Oceanbird’s sails has been a challenge, says Mikael Razola, the research project manager for Oceanbird. “That’s because these are the tallest sails that have ever been constructed. The top of the sails will be more than 100 meters above the water surface. At such a height, the wind direction and speed change a lot,” says Razola.

To better understand the atmospheric conditions(大气条件) at this height, Wallenius put sensors on top of its existing vessels to gather data of wind. “All of this information has helped us make the most of the power available in the wind and design an efficient wing vessel,” says Razola.

With its special sails, Oceanbird will outperform conventional car carriers in the aspect of exhaust emission. Nowadays, the shipping industry is under pressure to reduce emissions of CO2 and other greenhouse gases. According to the International Maritime Organization, the UN body that regulates global shipping, shipping accounted for 2. 89% of global manmade greenhouse gas emissions in 2018. And in the same year, this organization introduced a mandatory( 强 制 的 ) 50% reduction of total annual greenhouse gas emissions by 2050. Oceanbird is designed to exceed(超过) the target---Wallenious said the ship would emit 90% less CO₂ than other car carriers.

With a stop speed of about 10 knots, Oceanbird will be slower than standard car carriers, which can travel at 17 knots. It will take around 12 days, instead of the standard seven to cross the Atlantic. “This long journey will require some scheduling changes as well as acceptance from carmakers,” said Razola. “But the response so far has been very positive. ”

Researchers in Wallenious have built a 7-meter model of Oceanbird which will sail in Stockholm’s archipelago to gather data that will help finalize the ship’s design. “It will take around three years to launch the full-size version. Our ambition is to see Oceanbird sailing in 2024,” Razola said.

9 . With 60 miles of canals and nearly 7,000 buildings dating from the 18th century or earlier, Amsterdam is one of Europe’s best preserved cities. Here are some of our favorites.

The Concertgebouw

A free classical concert in one of the world’s greatest concert halls? Sounds too good to be true, but every Wednesday at lunchtime that’s exactly what’s on offer at the Concertgebouw. The latest series just started up again this month and will run through June. You can pick up a free ticket (one per person) on the day of the show starting at 11:30 a.m.; the concert takes place from 12:30 p.m. to 1 p.m.

Rijksmuseum Gardens

Take a walk in the beautiful formal gardens of the Rijksmuseum, which are dotted with fascinating artworks. There’s a life-size chessboard, a fountain by contemporary Danish artist Jeppe Hein, and post-war climbing frames by architect Aldo van Eyck. The gardens also host sculpture exhibitions — currently there are 21 sculptures on show by the Spanish artist Joan Miró until October 11.

The Muziektheater

This important opera, dance and music venue has free weekly lunchtime concerts by top performers on Tuesdays from 12:30 p.m. to 1 p.m. in the entrance hall, from September to May. Once or twice a month, the concert is followed by a free tour of the theatre — check the website for details.

Central Library

At the Netherlands’ biggest library, the Centrale Bibliotheek, you can read the international papers for free, and while Wi-Fi isn’t completely free, you can purchase 30 minutes for little more than a dollar by using one of the ticket machines. Upstairs on the 7th floor there is a café with a balcony that boasts wonderful city views.

10 . These days there is so much tempting technology to look at: smart phones, tablets, computer games and TV screens. Much of children's entertainment and education comes from using them, so it's no wonder they spend so much time staring at them. But even if the saying that looking at a screen for too long gives you square eyes isn't true, there is still some concern. So, should we be worried?

Certainly for children who spend hours glued to a screen, there is a concern that their health might be at risk. Also there is a fear that their eyesight is declining too. Although there's not much evidence to prove this yet, recent findings have brought the problem into light.

Chris Hammond, consultant at St Thomas' Hospital, says “We find short-sightedness is becoming more common It has greatly spread in East Asia, Singapore, Taiwan, South Korea where approaching 90 of 18-year-olds are now short-sighted.”

But can this be linked to children's obsession with using electronic gadgets? Annegret Dahlmann, expert at Moorfields Eve Hospital in London. says lack of natural light seems to be the key issue. She's suggested that children in East Asia study a lot, using computers, smart phones or tablets, and they go outside less. Wearing glasses is one solution, but it's not ideal.

This leads to a dilemma: achieving short-term academic success or protecting your long-term eyesight. It's always going to be a challenge to drag children away from their screens and it's likely that more and more studying will be done online. But despite that, Professor Hammond says. “In countries like urban China, where 10% of children in each class per year are becoming short-sighted from about the age of six. there's an argument for saying we should be trying to prevent it.” It's evidence we can't turn a blind eye to. So, maybe it's time to hit the “off” button and get our children outside?