Harvard researchers have created a tough, low-cost, biodegradable (可生物降解的) material inspired by insects' hard outer shells. The material's inventors say it has a number of possible uses and someday could provide a more environmentally friendly alternative to plastic. The material, made from shrimp ('虾) shells and proteins produced from silk, is called "shrilk." It is thin, clear, flexible and strong.

    A major benefit of the material is its biodegradability. Plastic's toughness and flexibility represented a revolution in materials science during the 1950s and '60s. Decades later, however, plastic's very durability (耐用性) is raising questions about how appropriate it is for one-time products such as plastic bags, or short-lived consumer goods, used in the home for a few years and then cast into a landfill where they will degrade for centuries. What is the point of making something that lasts 1,000 years?

    Shrilk not only will degrade in a landfill, but its basic components are used as fertilizer(肥料), and so will enrich the soil.

    Shrilk has great potential, the inventors said. Materials from which it is made are plentiful in nature, found in everything ranging from shrimp shells, insect bodies to living plants. That makes shrilk low cost, and its mass production possible should it be used for products demanding a lot of material.

Work on shrilk is continuing in the lab. The inventors said the material becomes flexible when wet, so they're exploring ways to use it in wet environments. They're also developing simpler production processes, which could be used for non-medical products, like for computer cases and other products inside the home. They're even exploring combining it with other materials, like carbon fibers, to give it new properties.

    I went online to check if my pay was in my bank account. To my amazement, I discovered that not only had I been paid, a company I'd never worked for had also paid me! I knew I'd have been beside myself if my own salary was not in my account, so I tried to get the money back to the right person. It is easier said than done.

    The bank couldn't help as it wasn't a bank problem. The human-resource department as the company that paid me was unable to help as I didn't have enough details. I rang the bank again. Thankfully I had sympathetic call operator who gave me a name, so I again rang the company "Daniel" worked for.

    I expected the bank would contact me to arrange to take the money from my account and repay Daniel. I heard nothing for a month and the money remained in my account when Daniel called, explaining he'd tried to get back his money but had been unsuccessful as neither the bank nor his company felt it was their error. He had rung to ask if I could speak to the bank, but after chatting for a few minutes we realized we could probably fix this problem ourselves.

    We decided I would take the money from my account and he would pick it up from me. Due to my busy job I was unable to meet Daniel personally but he left me a lovely bottle of wine in exchange for what was rightfully his. I never had any intention of keeping Daniel's pay, but red tape（繁琐手续）made it difficult to do the right thing. It all came down to two people being able to do what a huge bank and a large company couldn't do — admit a mistake has occurred and fix it.

    Have you ever run into a careless cell phone user on the street? Perhaps they were busy talking, texting or checking updates on WeChat without looking at what was going on around them. As the number of this new "species" of human has kept rising, they have been given a new name — phubbers（低头族）.

    Recently, a cartoon created by students from China Central Academy of Fine Arts put this group of people under the spotlight. In the short film, phubbers with various social identities bury themselves in their phones. A doctor plays with his cell phone while letting his patient die, a pretty woman takes selfie（自拍照）in front of a car accident site, and a father loses his child without knowing about it while using his mobile phone. A chain of similar events eventually leads to the destruction of the world.

    Although the ending sounds overstated, the damage phubbing can bring is real. Your health is the first to bear the effect and result of it. "Constantly bending your head to check your cell phone could damage your neck," Guangming Daily quoted doctors as saying. "the neck is like a rope that breaks after long-term stretching." Also, staring at cell phones for long periods of time will damage your eyesight gradually, according to the report.

    But that's not all. Being a phubber could also damage your social skills and drive you away from your friends and family. At reunions with family or friends, many people tend to stick to their cell phones while others are chatting happily with each other and this creates a strange atmosphere, Qilu Evening News reported.

    It can also cost you your life. There have been lots of reports on phubbers who fell to their death, suffered accidents, and were robbed of their cell phones in broad daylight.

    Everything has its root. “Holiday”, is no exception. The origin of “holiday” is easy to see, coming from “holy day”, a day of particular religious significance, often celebrating the life of a saint (圣徒), during which no work was to be done. As far back as the 11th century, “holidays”, especially the major feast days, were times of “celebration and amusement”, as the Oxford English Dictionary puts it.

    The number of holidays steadily increased during the Middle Ages, until a medieval Englishman would have had the luxury of 40 to 50 days a year off work, depending on where he lived, in addition to a free day on Sundays.

    During the Reformation, Henry VIII abolished most of the holidays partly because of the Protestant (新教徒的) suspicion of saints, but more practically, because, according to historian Eamon Duffy, “A large number of holidays were making the people poor by limiting agriculture.” The people took a different view and organized a protest march—the Pilgrimage of Grace—partly to protect their days off.

    Though at first the religious and festive senses of holiday were combined, the word gradually came to be used for any kind of relaxing break from work. As the word was drawing away from a religious society, the number of authorized holidays was reduced, until by 1834 most workers had only four official days off a year, in addition to Sundays. Many factory workers amplified this time by staying home on “Saint Monday” to recover from what they had gotten up to the day before.

    By the late 19th century, employers were compromising and offering half-day Saturdays, the beginning of the “weekend”, a term first used in 1879. In 1908, an innovative mill in New England gave its employees all of Saturday off, and the practice of their getting the whole Saturday off spread widely during the Great Depression as a way to keep employment up. It took 400 years, but finally workers could enjoy as many holidays as they had in the 15th century.

This was no ordinary class. The students who came together were all science or engineering professors at Cornell University. They had interrupted their research to accept an invitation to take part in an unusual experiment: "an interesting week of poetry". This class was part of a study to answer the questions: Why is science difficult for many non-science students? What can teachers learn about teaching if they take a class that is not in their field? 

The students in the poetry class listened to lectures and took notes. They had reading tasks and had to write three short papers. All students noticed one thing—the importance of spoken words. In science and engineering classes, the instructors put tables and drawings on the blackboard. But in this poetry class, the instructors just talked. They didn't write anything on the board.

The scientists and engineers noticed one similarity between science and poetry. In both subjects, students need to find layers of meaning. Some layers are simple, clean, and on the surface;   other layers are deeper and more difficult. This search for different levels of meaning doesn't happen much in undergraduate science classes, but it is important later, in a graduate school. And it is always important in humanities (人文学科).

Both the poetry instructors and their students learned something about teaching from this experience. One poetry instructor, for example, now sees the importance of using careful, clear definitions when he explains a poem. He also plans to be more informative as he teaches. Most of the scientists agreed on several points. Firstly, humanities classes might help science students to see patterns and decide which information is important. Secondly, the poetry class was fun. One engineer decided, "We need to change the way we teach engineering to make it an enjoyable experience for students."

But perhaps the most important result of the experience was this: all of the professors began to think about how they teach and how they can teach better.

A Norwegian company has created what it calls the world's first zero-emission(排放), autonomous cargo ship(货船). Developed by chemical company Yara International, the ship was designed to reduce emissions of pollutants and greenhouse gases, and move goods away from roads to the sea.

The shipping industry accounts for between 2.5% and 3% of global greenhouse gas emissions, according to the International Maritime Organization. Nearly all of Norway's electricity is generated by hydroelectric power, which is generally considered to have much lower carbon emissions than burning fossil fuels, despite the fact that it still produces greenhouse gases.

Capable of carrying 103 containers and with a top speed of 13 knots, it will use a 7 MWh battery, with about a thousand times the capacity of one electrical car. The ship will be charged near the port before sailing to container harbors along the coast and then back again, replacing 40,000 truck journeys a year.

As well as providing a greener option compared to conventional cargo ships, there is no crewman, which means it will be more cost-effective to operate. Initially, loading and unloading the ship will require humans, but gradually, all loading, discharging, and some other operations will also be eventually operated using autonomous technology. That will involve developing autonomous cranes(起重机) and carriers, which are the vehicles that place containers onto ships.

According to researchers, fully autonomous ships are the future. But there are many challenges to overcome before autonomous ships can be used for commercial long sea journeys. Navigating traffic in large ports could be a major barrier.

Without a crew aboard to carry out maintenance checks, autonomous ships would need built-in self-diagnosing systems with the ability to detect and fix problems, or call for human assistance.

Although Yara International has no plans to add more autonomous ships to its operations, we may see more elements of AI technology used on commercial ships in the future. Elements are already being used in shipping today when it comes to the voyage and we'll see more partly autonomous elements added.