2 . Polly Arrowsmith is a clever bargain shopper, and knows exactly when her three local supermarkets make their daily price down. She estimates that hunting out food with yellow discounted labels saves her hundreds of pounds a year. But all this could soon be coming to an end. That’s because supermarkets are adopting dynamic pricing, controlled by artificial intelligence (AI) software.

It involves digital price tags that are displayed either on the shelf below the food items, or on high-tech labels attached the product itself. These prices are automatically, and wirelessly, updated by the AI when a particular item approaches its sell-by date. The AI also examines how much stock (库存) the store is holding of that item and makes the decision as to whether a markdown is requiredor not. Besides, it can help supermarkets better understand how to manage stock supply and avoid over-ordering. So we’re actually turning the current food waste problem into an opportunity and can help cut supermarkets’ food waste by more than a third.

Matt Wills, the co-founder of a firm called Acumen, warns that there are potential disadvantages to dynamic pricing. “Not knowing what the reference price is, consumers might not realise they are getting a deal at all,” he says. “This could also cause added complications for people who retired, if items are seen to be continually changing in price.”

The key, Mr. Wills believes, will be for supermarkets to have strict guidelines to ensure they can offer the benefits that dynamic pricing can bring, while ensuring AI doesn’t create unintended negative consequences for shoppers. Whether shoppers will welcome the change is another question, but Mr. Wills believes they’ll be won over by the price reductions they receive.

Ms. Arrowsmith admits she will miss the yellow discount stickers that have become part of her shopping routine. However, she also says she wants to see less food going to waste. “I’m happy to forgo really cheap pricing,” she says.

The concept of “gap days”     1     (appear) on a variety of social media platforms recently. Unlike a gap year, a gap day means an     2     (extreme) brief period of relaxation and escape from everyday routine. After resting, people will continue to devote     3     (they) to the busy pace of normal life.

Apart from “gap days”, other similar expressions have made     4     hit on the Internet, such as “city walk”, “da zi (activity partner)” and so on. This growing trend of creating new phrases or euphemisms (委婉语) for something otherwise ordinary and common has caused     5     (heat) discussion.

Some people think that these kinds of new phrases better cater to (迎合) people’s mindsets,     6     (show) their optimism. For example, the common expression “taking a walk” is neutral (中性的). But “city walk”     7     (be) the positive version of it, meaning “to explore the city with a curious mind”.

Others disagree, however, and think that it’s simply just a kind of “sugaring up”, satisfying one’s need for showing off. For example, “city walk” is the same as “taking a walk”     8     general. But by calling it a “city walk”, people feel like they are doing something fancier than it actually is.

But no matter how we think of these phrases, they have taken root in our daily lives and have already gained wide     9     (recognize) among the younger generation. So     10     we need to do is not make them out to be bigger than they actually are.

5 . We know it can be hard to put your phone to bed before you sleep. However, if you’re trying to improve your sleep, you really should ditch your phone at least an hour before bedtime. Luckily, our experts can help.

Scientific evidence suggests that the blue light emitted from your phone, tablet, computer, and TV suppresses (抑制) your body’s production of melatonin, a hormone (荷尔蒙) that plays an important role in your sleep cycle. Melatonin release in the evening helps you relax before bedtime. A 2013 study that analyzed technology use and sleep patterns with data from a National Sleep Foundation poll found that using devices like phones was tied to more sleep disruption than electronics that aren’t interactive.

Many of us use the excuse that our mobile devices serve as our wake-up calls, or keep them nearby to use meditation apps. If you want to use your phone as an alarm, consider setting it a couple of hours before you turn in for the night, and then setting the phone itself to bedtime mode for the rest of the evening.

Here’s another groundbreaking idea: You could get a real alarm clock. After reviewing them at Reviewed, we recommend the Sharp Dream Caster. Not only is it easy to set a wake-up time, the clock includes white noises and rain noises to help you sleep, plus a number of volume settings to pick what works best for you.

But an alarm clock won’t help you avoid doom-scrolling through social media. Take things a step further by avoiding using electronic devices. You can try reading a book (one made of paper), taking a bath or drinking a cup of chamomile tea.

Finally, if you want to keep up your meditation practice screen-free, consider the Morphée. It looks like a little music box and comes with a variety of breathing exercises and soundscapes to help you get to sleep.

6 . I started a Facebook page in July, and it’s steadily growing! The best part isn’t the number of its “followers” but its comments — I love reading about what people do, their ideas and views and get some feedback (反馈) on what I’m doing too.

In April of this year, I was invited by a friend to join her Social Change group. We were eight women from all walks of life, but we had one thing in common — we live in a fantastic country and yet we can see homeless people on the streets asking for money. We have a generous welfare system and a social housing scheme — but it’s a problem that is getting worse. We asked ourselves: What happens to homeless women?

Therefore, we volunteered at shelters. We met with social housing providers, shelter managers and social workers, and began to think what else we could do. We researched on which programs were having success. We had guest speakers at our meetings and began to get a clear picture about what we needed to do.

As luck would have it, we have been gifted a building in the city center. It’s old and needs a lot of work to bring it up to the standard. We want to provide more than just shelter to women in need. We aim to have six self-contained apartments providing full social services for women to stay in for up to two years. Thanks to the building provider, we have got our project off the ground.

I’m an ordinary person. If I can do this, anyone can. You can change the world. Look for the opportunity and just do it.

8 . Every morning in a city in Indonesia’s far east, sleepy teenagers can be seen walk slowly and with heavy steps through the streets on their unwilling way to school.

It is not a scene from some sci-fi movie but a controversial experiment to get the day off to a much earlier start for the sleep-deprived (缺乏睡眠的) teens. The pilot project in Kupang has twelfth-graders at 10 high schools start classes at 5:30 am.

Authorities say the project is intended to heighten children’s discipline. According to parents, though, their children are worn out by the time they get home. Schools in Indonesia generally start between 7:00 and 8:00 am. Teens in their school uniforms are now walking down dark streets or waiting for motorcycle taxis to get to school on time.

“It is extremely difficult and they now have to leave home while it’s still completely dark. I can’t accept this, for their safety is not guaranteed when it’s dark and quiet.” Rambu Ata, a mother to a 16-year-old, said, whose daughter Eureka now has to wake up at 4:00 am to get ready and ride a motorbike to school. “Now every time Eurek arrives home she is exhausted and falls asleep immediately.”

At least one scholar seems to agree.

“It has no connection with the effort to improve the quality of education,” Marsel Robot, an education expert from Nusa Cendana University. “In the long run, sleep deprivation could endanger the students’ health and cause a shift in behaviour. They will only sleep for a few hours and this is a serious risk for their health. This also will cause them stress and they will release their stress by acting out.”

A 2014 study published by the American Academy of paediatrics (儿科学) recommended that middle and high schoolers start classes at 8:30 am or later to allow enough time for sleep. The Kupang rule change was also challenged by local politicians, who demanded the government cancel what they called a baseless policy.

9 . A new study finds that less than seven percent of the adult population in the US have what health experts consider good cardiometabolic (心脏代谢) health.

Using information on roughly 55,000 people over the age of 20, the results show just 6.8 percent of American adults reached optimal (最佳的) levels of health in 2018. Moreover, the study found American health has been in sharp decline over the last 20 years. In 1999, one in three adults had a healthy weight. By 2018, that number fell to just one in four Americans. At the same time, three in five people were free of diabetes in 1999. By 2018, however, more than six in ten adults had the condition!

“These numbers are striking. It’s deeply problematic that in the United States, fewer than 1 in 15 adults have optimal cardiometabolic health,” says Meghan O’Hearn, one of the researchers from Tufts University. “We need a complete overhaul (革新) of our healthcare system, food system, and living conditions, because this is a crisis for everyone.”

Instead of just looking for signs of disease, the team focused their study on the signs of good, moderate, and poor cardiometabolic health. “Disease is not the only problem,” O’Hearn explains. “We don’t just want to be free of disease. We want to achieve optimal health and well-being.”

Researchers also found large health gaps between US adults of different genders, ages, and education levels. Specifically, the study found Americans with less education were half as likely to be in peak cardiometabolic health.

O’Hearn adds, “Identifying these individuals and addressing their health conditions and lifestyle early is critical to reducing growing healthcare burdens. Its impacts on national healthcare spending and the financial health of the entire economy are enormous. And these conditions are largely preventable. We have the public health and clinical interventions and policies to be able to address these problems.”