That woman carried a new blanket (毛毯) over her arm. Wordlessly, she gave it to me.

    “Is it finished?” I asked.

    She shook her head. “No. It is ready,” she replied. I handed her the money and took the blanket.

    “It is beautiful, so skillfully woven (编织),” I said to my mother. “But what did she mean when she said it was not finished? How can it be ready if it is not finished?”

    “I will tell you later,” my mother said, “but first I will take you to the Navajo village.”

    We went down to the village. A group of young men were making sand pictures. We walked through the whole village, watching the different things the people were doing.

    It was not until that evening that my mother finally explained the Navajo woman's words.

    “Did you notice anything about the things the people were making?” my mother asked.

    “What should I have noticed?” I looked at her and asked.

    “Each thing the Navajo make has one small part that is not complete. The designs (设计) in their sand pictures are often not perfectly done, for example —the line of a circle may not quite close. If you look carefully at your blanket, you will probably find a stitch (一针) missing.”

    I took the blanket off, but it looked as perfect as any design could be. Then suddenly, I noticed that sure enough a stitch was missing!

    “But why do the Navajo intentionally leave some tiny part unfinished?” I asked.

    “They believe that when anything is completed or finished, it means the end has come — it will not be perfect until then. Then too, with a circle, they believe that they must leave a pathway for the bad spirits to run away and the good spirits to come in. So, often, they do not make the line close.”

    It was a shock and a painful lesson for many people when the police announced the cause of a bus accident in Chongqing on Oct 28. Video footage (片段) from inside the bus suggested that after a passenger missed her stop and asked the driver to stop, but he refused. She began hitting him over the head with her cell phone. During the conflict, the driver lost control of the bus and it jumped into the Yangtze River, causing 15 deaths.

    Zheng Chuankai, a lawyer in Beijing, said the accident showed that it was important that those who cause danger to public safety face severe punishment. Such attacks are inhuman but common. In fact, it is not rare to hear of passengers attacking bus drivers in China. This month, a local court in Shenyang, Liaoning province, sentenced three people to up to three years in prison for endangering public safety by distracting bus drivers, Xinhua reported. “Passengers who interfere (妨碍) with bus drivers are endangering public safety, which is equal to serious crimes like arson (纵火) and poisoning.” Liu Changsong，a Beijing lawyer, told the Global Times.

To prevent similar cases from happening, many Chinese cities have taken measures to keep bus drivers safe. Dozens of cities including Beijing, Xi'an, Wuhan, Changsha and Nanning have plans to add safety fences to buses to protect drivers from any interference by passengers.

    The bus operator in Quanzhou, Fujian Province, has invited psychologists to teach drivers how to manage their emotions when facing an angry passenger. These measures are necessary, but they are not enough.

    “Public security is closely connected with social morality (道德). People should obey the law, be more self-disciplined and sensible.”

    Many countries have introduced measures to deal with the problem of violence against bus drivers. On every bus in the US state of New Jersey, a sign on the back of the driver's seat warns passengers that anyone attacking a driver can be fined or put into prison.

    In London, the local government has launched a program to train drivers to deal with angry passengers and avoid potential conflicts.

    Britain faces social problems as lots of people are set to lose their jobs in technological revolution, Bank of England's chief economist warned.

    Andy Haldane said the so-called Fourth Industrial Revolution will make the machine replace humans to do thinking things. The dark side of the change could be a much bigger breakdown of employment than in Victorian times, with professions such as accountancy (会计) among those at risk.

    A report by the accountancy firm PwC last month warned that more than 7 million jobs in Britain had been lost over the next 20 years as technological change sweeps though workplaces.

    The majority of these are in jobs in the retail, transport and manufacturing industries. However, other traditional professional sectors could also be at serious risk.

    Economists treat the arrival of increasingly intelligent computers and robots as the fourth industrial revolution. The first was the shift from agricultural to urban societies, the second saw the widespread use of electricity and steel, and the third was the digital revolution when computers, the Internet and mobile phones were developed.

    Mr. Haldane said the hollowing-out (空洞化) experienced in the past years could be on a greater scale in the future so it is important to learn the lessons of history and ensure that people are given training to take advantage of new opportunities.

    “Jobs were effectively taken by machines of various types, there was a hollowing-out of the jobs market, which left many people for a long period out of work and struggling to make a living,” Haldane added, “That heightened social and financial tensions, and led to a rise in inequality. This is the dark side of technological revolution.”

    “That hollowing-out is going to be potentially on a much greater scale in the future, when we have machines thinking and doing the cognitive and technical skills of humans.” Mr. Haldane said professions like accountancy could be among those hardest hit by the rise of AI. But he suggested economists could escape.

    I had the meanest mother in the whole world. While other kids ate candy for breakfast, I had to have porridge, eggs or toast. When others had Coke and candy for lunch, I had to eat a sandwich. But at least I wasn't alone when I was sad. My sister and two brothers had the same mean mother as I did.

    My mother preferred to know where we were at all times. She had to know who our friends were and where we were going. We had to clean clothes and take a bath every day. The other kids got to wear the same clothes for days. We could not lie in bed "sick" in order to miss school.

    The worst is yet to come. We had to be in bed by nine each night and get up at eight the next morning. We couldn't sleep till noon like our friends. So while they slept, my mother was brave to break the Child Labour Laws. She made us work. We had to wash dishes, make beds, and learn to cook and all kinds of things at home. I believe she lay awake thinking up all things for us to do.

    My mother was a complete failure as a mother. Two of her children received higher education. None of us have ever been taken away by the police or divorced (离婚). She forced us to grow up into educated and honest adults. I am now trying to raise my three children this way. I am filled with pride when my children call me "mean". Why? Because now I thank God every day for giving me the meanest mother in the world.

Iman, the last Sumatran rhino(犀牛) in Malaysia, died in 2019 — bringing the endangered species one step closer to extinction. Now, Malaysian scientists are hoping to use tissues and cells from Iman and other dead rhinos to bring the population back.

"Before the three rhinos (the last survivors in Malaysia) died, we got their cells, and the cells are still alive — which is why I'm quite confident," Dr. Lokman said. "If we don't have any cells, or have just tissue that isn't living anymore, we wouldn't be able to do anything. But now we have a living thing that we can use. "

The cells came from the rhinos'hearts, lungs and brains. What is the most important is that the team collected stem cells (干细胞). One possible approach is to develop these stem cells into an egg (卵子) and sperm (精子), to create an embryo (胚胎) that will be placed into a surrogate mother (代孕母亲). She will likely be another rhino, either a Sumatran rhino from another country or another species. The other method is to take the egg of a surrogate animal, remove the nucleus (细胞核), and join it with a Sumatran rhino's body cell. This technique was famously used to clone Dolly the sheep in 1996. Dr. Lokman and his colleagues are trying both ways. The team is still in the early stages; next, they need to find a suitable surrogate female.

Sumatran rhinos are listed as critically endangered by the World Wildlife Fund. There are less than 80 alive in Indonesia and Thailand. The fall in the population was first caused by hunting. Later, the situation was worsened by the loss of habitats and human activity. Unfortunately, there are now only five remaining rhino species worldwide, and all are threatened. Some sub-species have already died out; the western black rhino was declared extinct in 2013. And it is a pity that the last male northern white rhino died in 2019.

There're plenty of fresh fruits and vegetables available in local markets.But while those red juicy strawberries look  fresh,consumers have no way  of knowing how  long the  fruit  can be  stored  at  home.The  same  goes  for distribution centers and supermarkets.

Now,the food technology startup OneThird,located in the Netherlands,is looking to change that with an infrared (红外线)scanner that can accurately predict how long fresh fruits and vegetables will last.The startup is named OneThird because one-third of food is wasted due to spoilage(变质)every year.

The startup's founders were inspired by a UK company that uses this type of technology in the medical field and decided to see if it was applicable for food."I looked at the challenges in the food-supply chain and found out that 40 percent of food waste is fresh produce.One of the biggest causes of waste is that nobody knows shelf life." founder and CEO of OneThird,Marco Snikkers said.  Quality inspections at farms and distribution centers are done manually(手动地).An inspector checks the fruits and vegetables and makes notes about the size and quality.Then the food is sent to consumers without considering travel time or how long the produce will remain usable.

Using the infrared scanner at the distribution center means that inspectors can use the information to approve shipments that will ensure the produce can be distributed on a timely basis.This means that a shipment of ripe tomatoes will not be sent long distances away.

OneThird's scanner combines the technology of optical scanners,image modeling,and Artificial Intelligence to provide accurate shelf-life predictions.  The startup found that the technology can reduce up to 25 percent produce waste that was caused by spoilage. "Global food waste has an enormous environmental impact;reducing global food waste cuts global greenhouse gas emissions and promotes global food security,"said Jacob Smith,a climate expert from the University of Maine.