A few years ago, I read about an eight-year-old girl who studied elephant poaching in school and made a poster for her local grocery store. The slogan read, "Save the elephants. Don't buy Ivory Soap, or they will die out." What the girl had done taught me a lesson. Since then, I have looked at eight-year-olds in a different way. As an environmental educator, I used to teach eight-year-olds about the harm of elephant poaching, rainforest destruction, and global warming. I had a degree in natural science—but not in child development. What did I think I was accomplishing by putting my environmental concerns on the shoulders of kids who still believe in fairy tales?

Kids develop the fear of nature when their primary contact with the natural world is hearing bad news about the environment. If I wanted to inspire conservation action, I needed to change my ways, but now? I came across a research by psychologist Louise Chawla. She wanted to know what had gone on in the childhoods of adults who are good environmental citizens. She found two things most common. They had free time to explore the rivers or woods down the street, and they had an adult in their lives who was enthusiastic about the natural world. I understand now that what turned me into a good person today was a childhood spent playing in the field and having a dad who knew that finding a lobster under a rock was better than finding treasure.

    So that's what I was doing when I was eight years old—looking under rocks, climbing trees, and picking wild .flowers. I didn't know a thing about the Clean Air Act that was being debated in congress at that time. I didn't hear a lot of environmental problems. But I built a relationship with nature and I grew up to care. Now I treat my own kids like the child I was. My kids turn off the water when they brush their teeth and turn off the lights when they leave a room.

Best Inventions

    Sun Power

    People who buy solar panels (嵌板）for their home hope to help the environment and save some money. But they end up with large metal boxes on their roof. Tesla, a car company, solved the problem. The solution is the Solar Roof. It is a series of tiles (瓦) made to look like traditional roofing material while using the power of the sun. Tesla developed it with SolarCity, a longtime provider of solar panels. It is now available to the public.

    Talking Tech

    Echo gives users the ability to talk to their tech. Apple's Siri and Microsoft's Cortana do that too. But in many ways，Amazon's version，Alexa, which is built into Echo，is more powerful. Alexa has grown since it was put on the market in 2014, and today, you can use it to turn on the lights, order a pizza, and more. Echo costs $ 180. Amazon recently developed a junior version, the $ 50 Echo Dot.

    Spin and Roll

    Goodyear is reinventing the wheel. It introduced its Eagle 360 spherical tire (球形轮胎) in March, 2016. The tires allow cars to move in many directions, including sideways, and at angles to handle slippery surfaces. The key is magnetic levitation (磁悬浮). Tires are fixed to cars, but Eagle 360s float beneath them. They're meant for self-driving cars of tomorrow.

    Cycle Safety

    Jeff Woolf had a serious bike crash. If he hadn't been wearing his helmet, he would have been badly hurt. He wondered why so many riders didn't wear helmets. That turns out it was mostly because helmets were big and hard to carry around. Woolf, an engineer, came up with Morpher. The helmet is made from interwoven plastics (交错编织的塑料). It is strong, but it's also flexible enough to fold almost totally flat. That makes it easy to carry. Morpher is priced at $ 119.

    Rich countries are racing to dematerialise payments. They need to do more to prepare for the side-effects.

    For the past 3,000 years, when people thought of money they thought of cash. Over the past decade, however, digital payments have taken off— tapping your plastic on a terminal or swiping a smartphone has become normal. Now this revolution is about to turn cash into an endangered species in some rich economies. That will make the economy more efficient—but it also causes new problems that could hold back the transition(转型).

    Countries are removing cash at varying speeds. In Sweden the number of retail cash transaction per person has fallen by 80% in the past ten years. America is perhaps a decade behind. Outside the rich world, cash is still king. But even there its leading role is being challenged. In China digital payments rose from 4% of all payments in 2012 to 34% in 2017.

    Cash is dying out because of two forces. One is demand— younger consumers want payment systems that plug easily into their digital lives. But equally important is that suppliers such as banks and tech firms (in developed markets) and telecoms companies (in emerging ones) are developing fast, easy-to-use payment technologies from which they can pull data and pocket fees. There is a high cost to running the infrastructure behind the cash economy—ATMs, vans carrying notes, tellers who accept coins. Most financial firms are keen to abandon it, or discourage old-fashioned customers with heavy fees.

    In the main, the prospect of a cashless economy is excellent news. Cash is inefficient. When payments dematerialise, people and shops are less open to theft. It also creates a credit history, helping consumers borrow.

    Yet set against these benefits are a couple of worries. Electronic payment systems may risk technical failures, power failure and cyber-attacks. In a cashless economy the poor, the elderly and country folk may be left behind. And a digital system could let governments watch over people's shopping habits and private multinationals exploit their personal data.

    When French students go to school, they have to leave one of their most prized possessions at home — their smartphones. French lawmakers passed a law on July 31, 2018, banning students 15 and under from bringing smartphones and tablets to school, or at least requiring they be turned off at school. Officials in support of the new rule described the policy as a way to protect children from addictive habits and to safeguard the sanctity of the classroom.

    "We know there is a phenomenon of screen addiction," education minister Jean-Michel Blanquer said. "Our main role is to protect students. It is a fundamental role of education, and this law allows it."

    The law, however, makes exceptions for educational use, after-school activities and for students with disabilities. French high schools can choose to force a less-strict ban on Internet- connected devices.

    Even before the new policy was voted in, French law carried out in 2010 prohibited students from using their phones while class was in session. But during the 2017 French presidential election, Emmanuel Macron promised to force a school ban on phones entirely.

    This isn't the first French law designed to beat back the influences of digital technology in everyday life. In 2017 the government passed a law requiring French companies to draft rules that limited work emails and work-related technology outside the office. Referred to as the "right to disconnect," French officials said the law aimed to reduce job-related stress and prevent employee burnout.

    "Employees physically leave the office, but they do not leave their work. They remain attached by a kind of electronic tie," said Benoît Hamon, former French education minister. "The texts, the messages, the emails: they control the life of the individual to the point where he or she eventually breaks down."

    If you're encouraged by the tiny house movement and think 160 square feet is just enough for your needs, you may want to contact the Academy of Construction and Design (ACAD) at IDEA Public Charter School in northeast Washington.

    Students in the program built a micro house with a kitchen, a bathroom, a sleeping loft with space for a queen-size bed and a storage loft, all set on a trailer for mobility. The exterior (外部) of the house was part of a continuous living exhibit in 2015and was moved to the IDEA campus so students could work with builders to complete the interior earlier this year.

    McMahon said the D.C. government's approval to push companies to hire District residents (居民) was at odds with the school system not preparing students for careers in construction, exploring or electrical work. McMahon gathered industry and community leaders to establish ACAD in 2005 and he said 100 percent of the companies he contacted responded positively to the idea, including major firms such as JBG, Clark Construction, Hines Construction and Boston Properties.

    "When students make the connection between what they are learning and a potential career, their academics improve dramatically," said Carol Randolph, chief operating officer of the D.C. Students Construction Trades Foundation. "Some of them who didn't think college was an choice now have a better chance because their classes have become relevant to a job."

    "We teach them life skills and explain that even if you start as a laborer, there are opportunities to move up quickly," he said. "We rewrite the story for them and explain that they can work for a few years, make good money, get promoted, and start their own business or go to school with less debts."

    "Parents and school advisors can be the biggest obstacles because of the negative idea of construction as a blue-collar career," Karriem said. "I get middle-school advisors on board to talk about the opportunities this education provides. These kids are learning lifelong skills that can help them in other fields, provide them with income and allow them to take care of their homes."

    Science is finaly beginning to embrace animals who were, for a long time, considered second-class citizens.

    As Annie Potts of Canterbury University has noted, chickens distinguish among one hundred chicken faces and recognize familiar individuals even after months of separation. When given problems to solve, they reason: hens trained to pick colored buttons sometimes choose to give up an immediate food reward for a slightly later (and better) one. Healthy hens may aid friends, and mourn when those friend die.

    Pigs respond meaningful to human symbols. When a research team led by Candace Croney at Penn State University carried wooden blocks marked with X and O symbols around pigs, only the O carriers offered food to the animals. The pigs soon ignored the X carriers in favor of the O's. Then the team switched from real-life objects to T-shirts printed with X or O symbols. Still, the pigs walked only toward the O-shirted people: they had transferred their knowledge to a two-dimensional format, a not inconsiderable feat of reasoning.

    I've been guilty of prejudiced expectations, myself. At the start of my career almost four decades ago, I was firmly convinced that monkeys and apes out-think and out-feel other animals. They're other primates(灵长目动物), after all, animals from our own mammalian(哺乳动物的) class. Fairly soon, I came to see that along with our closest living relatives, whales too are masters of cultural learning, and elephants express profound joy and mourning with their social companions. Long-term studies in the wild on these mammals helped to fuel a viewpoint shift in our society: the public no longer so easily accepts monkeys made to undergo painful procedure kin laboratories, elephants forced to perform in circuses, and dolphins kept in small tanks at theme parks.

    Over time, though, as I began to broaden out even further and explore the inner lives of fish, chickens, pigs, goats, and cows, I started to wonder: Will the new science of "food animals" bring an ethical (伦理的) revolution in terms of who we eat? In other words, will our ethics start to catch up with the development of our science?

    Animal activists are already there, of course, committed to not eating these animals. But what about the rest of us? Can paying attention to the thinking and feeling of these animals lead us to make changes in who we eat?