Britons may like to complain a lot, but they rarely do so right now, explains BBC writer Ruth Margolis. They would rather grumble (发牢骚) afterward. This is because Britons hate to put someone out and cause any embarrassment. Margolis writes, “For instance, I'm much more comfortable just leaving that piece of raw chicken on my plate instead of complaining to restaurant staff. But beware: if this kind of thing happens when you're dining with an American, they will most likely speak up on your behalf and not understand why you find this ashamed.”

    In a BBC blog post comparing cultural differences between the UK and the US, Margolis mentions a few other things that Americans like to do that are offensive to Britons.

● Not making introductions

    Margolis says most Britons dislike this approach because “talking to strangers without being introduced gives them a stomachache”. Americans rarely introduce a new friend to their friends at parties. Strangers are supposed to introduce themselves.

● “Quite” good

    Using “quite” to mean “very” happens a lot in the US. But if you are invited to a dinner party in Britain, don't describe the meal as “quite good” if you want to express high praise. To Britons' ears, “quite” detracts from the “good”: the meal was OK but could have been better.

● Money Talk

    Americans can talk about money subjects for hours without feeling uncomfortable. For Britons, says Margolis, “Talking about how much we make is unthinkable — even 1ess so than discussing our feelings.”

● Over-politeness

    “It's not that I want shop assistants to be actively rude. But neither do I want to expend energy responding to someone who's been paid to ask: ‘How are you today?'” says Margolis. In the US, it is not unusual to be greeted by a perfect stranger as “honey” or “sweetie”. But Margolis says Britons find put-on friendliness, especially in stores, deeply irritating.

    When Sarah Hansen first came to Bonnie Schlachte's ballet studio, she jokingly called herself a “weeble-wobble,” telling her ballet teacher that when she tried to walk, she would fall. “She couldn't walk across the room without holding on to something,” recalls Schlachte. “She would immediately fall.”

    Hansen was only in middle-school, but a progressive neurological disease was hindering her ability to walk, let alone do ballet. But Hansen had a tenacious spirit and desperately wanted to learn ballet. Hansen joined in weekly group classes at Schlachte's ballet studio called Ballet for all Kids, a studio that teaches children with disabilities. Soon after she began classes and private lessons, her family saw a vast improvement in her ability to move.

    She worked tirelessly in the studio, focusing on what her instructor wanted from her. “At the time, her foot wouldn't fully rest on the floor,” explains Schlachte. “That's why she couldn't stand on her own, there was no support.”

    Schlachte pushed her student, explaining to Hansen that her brain has neuroplasticity(可塑性) so eventually it will receive the message.

    As a mom, a classically trained ballerina, and holding a degree in psychology, Bonnie Schlachte was the perfect person to push Hansen to do her best. Schlachte put herself through college with dance and theater scholarships. After graduation, she came across an opportunity with children with developmental disabilities. She fell in love and chose to focus on jobs in that field.

    Years later, Schlachte found herself watching and celebrating Hansen, who at one point could barely walk, was now moving across the floor on her own two feet. “One day, her ankle dropped, and she put her whole foot on the ground,” says Schlachte. “I was crying, her mom was crying, it was a great moment.”

    Hundreds of years ago, a Roman army came north from England to make war on Scotland. The Scots, a brave people, love their country. They fought hard to drive the enemy out of Scotland. But there were too many of the Romans. It looked as if the Romans would win.

    One night, the leader of the Scots marched his soldiers to the top of a hill. “We will rest here tonight, my men,” he said, “Tomorrow we will fight one more battle. We must win, or we will die.”

    They were all very tired. So they ate their supper quickly and fell asleep. There were four guards on duty, but they were very tired, too, and one by one, they fell asleep.

    The Romans were not asleep. Quickly they gathered at the foot of the hill. Slowly they went up the hill. Closer they came to the sleeping Scots. They were almost at the top. A few minutes more the war would be over. Suddenly, one of them put his foot on a thistle (蓟). He cried out and his sudden cry woke the Scots. In a minute they were on their feet and ready for a battle. The fighting was hard, but it did not last long. The Scots wiped out the Romans and saved Scotland.

    The thistle is not a beautiful plant. It has sharp needles all over it. Few people liked it. But the people of Scotland liked it so much that they made it their national flower.

    Cao Yuan, a PhD student from China, had two papers published on strange behaviour in atom-thick layers of carbon that have opened up a new field of physics.

    Pablo Jarillo-Herrero's group at MIT was already layering and rotating (旋转) sheets of carbon at different angles when Cao joined the lab in 2014. Cao's job was to find out what happened when one graphene (石墨烯) sheet was twisted only slightly wiht respect to the other, which one theory predicted would thoroughly change the material's behaviour.

    Many physicists doubted the idea. But when Cao set out to create the subtly twisted stacks, he spotted something strange. Exposed to a small electric field and cooled to 1.7 degrees above absolute zero, the graphene—which ordinarily conducts electricity—became an insulator. That by itself was surprising. But the best was yet to come: with a slight change to the field, the twisted sheets became a superconductor, in which electricity flowed without resistance.

    The ability to get atom-thick carbon into a complex electronic state through a simple rotation now has physics demanding to engineer exciting behavior in other twisted 2D materials. Some even hope that graphene could shed light on how more-complex materials superconduct at much higher temperatures. "There are so many things we can do," says Cory Dean, a physicist at Columbia University. "The opportunities at hand now are almost irresistible."

    Hitting graphene's “magic angle”—a rotation between parallel sheets of around 1.1°—involved some trial and error, but Cao was soon able to do it reliably. His experimental skill was extremely important, says his supervisor Jarillo-Herrero. Cao pioneered a method of tearing a single sheet of graphene so that he could create a stack of two layers, from which he could then fine-tune alignment (微调校准).

    Cao loves to take things apart and rebuild them. A heart, he is “a tinkerer”, his supervisor says. On his own time, this means photographing the night sky using homemade cameras and telescopes—pieces of which usually lie across Cao's office. "Every ime I go in, it's a huge mess, with computers taken apart and pieces of telescope all over his desk," says Jarillo-Herrero.

    In recent years, terms like "going green" and "eco-friendly" have become buzz words on talk shows, commercials and product packaging. The term "eco-friendly" has been used for so many different products and practices.

    Eco-friendly Car Race

    Can you imagine a car racer is so eco-friendly that its tyres are made from potatoes, its body is created from hemp (大麻) and rapeseed oil and it runs on fuel made from wheat and sugar beet (甜菜)? The one-seater racing car called Eco One is built by experts from Warwick University, who hope that Eco One will be adopted by the automotive industry. It is sold at $ 51,000.

    Pollution-sensitive Dress

    Don't be caught outside unaware of pollution levels in the air. The pollution-sensitive EPA Dress by Stephanie Sandstrom notices pollution in the air accordingly. This dress ­ which is actually quite pretty ­ looks like you pull it from the bottom of the dirty laundry pile when the air is dirty. It might protect your health by advising you to stay indoors for the day, but it won't do you any favor if you're meeting with clients.

    Eco-friendly Umbrella

    Traditional umbrellas come with a fixed surface. Although it is changeable, you cannot replace it easily. This eco-friendly design is more flexible. It is actually only an umbrella skeleton(骨架)without any surface, which can be folded, so you can put anything such as newspapers, plastic bags or whatever you want to serve as the protecting surface.

    Eco-friendly Moss (苔藓) Carpet

    It is said that walking on fresh grass increases your blood circulation. The Moss Carpet, created by Nguyen La Chanh, looks at getting the grass to your feet. The mat includes ball moss, island moss and forest moss. The humidity (湿度) of the bathroom ensures that it grows well. And that's why you need to place it there and not anywhere else.

    Owen Williams and his wife befriended their eighty-year-old neighbor, Ken Watson, when they moved into their home in Wales three years ago. When their daughter, Cadi, was born a year later, Watson became a grandfather figure, taking the time to drop off Christmas presents for the child. Watson died in October.

    On Monday, Watson's daughter stopped by the Williams home with a large bag containing 14 wrapped Christmas presents her father had bought and wrapped for Cadi.

    Williams posted notes about what happened on Twitter to spread some Christmas spirit. He wrote that he wasn't sure whether he should give his daughter all the presents now, or hold onto them and give her one a year. Twitter responded in a big way, with many saying the story brought them to tears. So many people weighed in about the gifts, in fact, that Williams made a Twitter poll. So far, more than 55, 000 people have voted on how he should distribute the gifts.

    Williams, who is a social-media consultant, said the majority of people are voting for giving Cadi one present a year. He said he has no idea what is in the packages, but he's leaning toward listening to the will of the voters. "I think we're going to turn it into a Christmas story for our daughter," he said. "We'll do one a year for the next 14 years. It feels like the right thing to do now. If she opens a box of Lego when she's 16 then so be it."

    He said he was struck by how many people have responded by saying their neighbors are virtual strangers to them. "The thing that stands out to me is how few people know their neighbors," Williams said. "People are saying, 'That's so lovely. I don't even know my neighbors.' … This Christmas, take your neighbors a bottle of wine or a small gift, a token. Just say, 'Hi.' You can open a new world like we did."