With only about 1,000 pandas left in the world, China is desperately trying to clone (克隆) the animal and save the endangered species (物种). That's a move similar to what a Texas A & M University researchers have been undertaking for the past five years in a project called "Noah's Ark".

    Noah's Ark is aimed at collecting eggs, embryos(胚胎), semen and DNA of endangered animals and storing them in liquid nitrogen. If certain species should become extinct, Dr. Duane Kraemer, a professor in Texas A& M's College of Veterinary Medicine, says there would be enough of the basic building blocks to reintroduce the species in the future.

    It is estimated that as many as 2,000 species of mammals, birds reptiles will become extinct in over 100 years. The panda, native only to China, is in danger of becoming extinct in the next 25 years.

    This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda into the egg cells of a Japanese white rabbit. They are now trying to implant the embryo into a host animal.

    The entire procedure could take from three to five years to complete.

    "The nuclear transfer (核子移植) of one species to another is not easy, and the lack of available (capable of being used) panda eggs could be a major problem," Kraemer believes. "They will probably have to do several hundred transfers to result in one pregnancy (having a baby). It takes a long time and ifs difficult, but this could be groundbreaking science if it works. They are certainly not putting any live pandas at risk, so it is worth the effort, adds Kraemer, who is one of the leaders of the Project at Texas A& M, the first-ever attempt at cloning a dog.

    "They are trying to do something that's never been done, and this is very similar to our work in Noah's Ark. We're both trying to save animals that face extinction. I certainly appreciate their effort and there's a lot we can learn from what they are attempting to do. It's a research that is very much needed."

    While the start of a new school year is always exciting, this year was even more so for some elementary school students in Auckland, New Zealand. They became the world's first kids to be" taught" by a digital teacher, Will. Will is just an avatar(用户头像)that appears on the student's desktop, tablet, or smartphone screen, not a human-like robot walking around the classroom.

    Auckland energy company Vector and AI company Soul Machines worked together to develop Will, which has been modeled after the human brain and nervous system, allowing it to perform human-like behavior. The digital teacher is currently assigned to teach Vector's" Be sustainable with energy, "a free program for Auckland elementary schools.

    Just like the humans it replaced, Will is able to instantly react to the students' responses to the topic. Thanks to a webcam(网络摄像头)and microphone, the avatar not only responds to questions the kids may have, but also picks up non-verbal cues(非口头提示).For instance, if a student smiles at Will, he responds by smiling back. This two-way interaction not only helps capture the students' attention, but also allows the program's developers to monitor their engagement, and make changes if needed.

    Vector's Chief Digital Officer, Nikhil Ravishankar says," What was fascinating to me was the reaction of the children to Will. The way they look at the world is so creative and different, and Will really captured their attention."

    Will, in place since August 2018,has been a great success thus far. However, regardless of how popular it becomes, Will is unlikely to replace human educators any time soon .For one, the avatar's knowledge base is severely restricted. But more importantly, even the smartest digital avatars could never predict and react to all the unexpected situations that educators have to deal with on a daily basis. However, it could come in handy as a" personal tutor", providing kids with one-on-one help on specific subjects or even topics.

    No one can deny that buttons are an important clothing device. But, can they rise to the level of art? Organizers of an exhibit in New York City think so.

    Peter Souleo Wright organized “The Button Show” at Rush Arts Gallery in the Chelsea neighborhood of Manhattan. Eleven artists used the small, ordinary objects to create sculptures, portraits and wearable art. Some of the works are political, some are personal and others are just fun.

    Wright said each artist reimagines and repurposes the buttons to make art. “What I tried to do with this show,” he said, “was to look at artists who were promoting that level of craft.”

    He said he wanted the button art to be comparable to a painting “because of the amount of detail and precision in the work.”

    Artist Beau McCall produced “A Harlem Hangover”. It looks like a wine bottle that fell over on a table. A stream of connected red buttons hand over the side, like wine flowing down. Similar red button form a small pool on the floor.

    McCall layers buttons of different shapes and sizes to create the bottle. The stitching that holds them together is also part of the artistic design.

    For San Francisco-based artist Lisa Kokin, buttons are highly personal. After her father died in 2001, she created a portrait of him using only buttons. That memorial to her father led to other button portraits, including those of activists Rosa Parks and Cesar Chavez.

    Others use buttons for details. Artist Amalia Amaki of Tuscaloosa, Alabama, placed them on and around old photographs. Los Angeles artist Camilla Taylor attached buttons to three large sculptures that look like headless animals with long, narrow legs.

    “The Button Show” ends at March 12. The Rush Philanthropic Arts Foundation paid for the exhibition. The foundation was created in 1995 by the Simmons brothers: artist Danny, hip-hop producer Russell and rapper Rev. Run. The foundation seeks to bring the arts to urban youth and to provide support for new artists.

    Your next car could have two seats, three wheels two in front and one in the back and a top speed of more than 100 miles per hour. Elio Motors plans to make such a tiny car named the Elio. Its two seats sit front and back instead of side by side. The driver is positioned in (he center with the passenger directly behind.

    The starting price for the car is just ＄6.800. It has only one door, on the left side, which cuts a few hundred dollars off the manufacturing costs. Having three wheels also makes it cheaper. It has air conditioning, power windows and door locks and an AM/FM radio. More features can be ordered through Elio's long list of suppliers. Elio will also sell the cars directly through its own stores and not through franchised dealers (特约经销商).

    Paul Elio dreamed as a kid that he would one day own a car company called Elio Motora. In 2008, tired of high gas prices, he started working on a car that burns gas in a more effective way. Equally important to him was creating US manufacturing jobs and making the car inexpensive enough to attract buyers who might otherwise be stuck in their old, unreliable cars. "Whatever matters to you, this can move the needle on," he said.

    Already, more than 27,000 people have reserved one. Paul hopes to make 250,000 cars a year by 2020. So far, reservation holders are those who will use the Elio as a second or third car for work. Paul Elio believes the car will interest college students as well as used-car drivers who want something newer and more reliable, though.

    How was your day today? If it was just sort of OK, with nothing much happening, then Scott Shaffer wants to hear from you. Mr Shaffer is the editor of the Journal of Mundane Behaviour. "We can learn a lot about the way that society works by examining normal patterns of behavior," he says. "All the ordinary decisions we make and ordinary things we do are society in action."

    The idea that social scientists should "study the unmarked", in Mr Shaffer's words, has also spread to historians. Traditionally, most history has been written as the story of greatness. It is all about great ideas, great people and great economic and social forces changing the way that millions of people live for ever. Albert Einstein's theory of relativity changed the way that we look at the universe. But has he been of more benefit to humanity than the unknown person who invented the first really comfortable shoe? Try thinking great thoughts when your feet hurt.

    In recent years, books of micro-history have been a great success with the public. Most micro historians like to relate their subject to wider developments in society. According to historian Catherine Gallagher, the potato was once a matter of great argument. Supporters pointed out that it could grow cheaply and easily and help feed the poor. Opponents said that this would lead to the poor becoming more powerful, since they did not have to spend every hour working to feed themselves. It seems that European socialism started with an argument about vegetables. British historian Colin Jones wants us to look at pictures painted hundreds of years ago. He wants us to notice the fact that nobody smiles in these pictures. Compare that with today, when everyone smiles for the camera and refusing to smile is seen as an unfriendly act. It is all because of dentistry, he says. Once people were able to look after their teeth, they began to smile and the world became a happier place.

    Whether stories like this are true or not, they put ordinary people at the center of history. Most of us are not going to change the world in a big way. But we might be able to do something that makes life a bit easier for other people. And maybe one day a historian will come along and write the story. It is something to get excited about, though perhaps not very excited.

I first came across the concept of pay­what­you­can cafés last summer in Boone, N. C. , where I ate at F. A. R. M (Feed All Regardless of Means) Café. You can volunteer to earn your meal, pay the suggested price ($10) or less, or you can overpay—paying it forward for a future customer's meal. My only regret after eating there was not having a chance to give my time. So as soon as Healthy World Café opened in York in April, I signed up for a volunteer shift(轮班).

F. A. R. M and Healthy World are part of a growing trend of community cafés. In 2003, Denise Cerreta opened the first in Salt Lake City. Cerreta now runs the One World Everybody Eats Foundation, helping others copy her pay­what­you­can model.

"I think the community café is truly a hand up, not a handout," Cerreta said. She acknowledged that soup kitchens(施粥所) have a place in society, but people typically don't feel good about going there.

"One of the values of the community café is that we have another approach," she said. "Everyone eats here, no one needs to know whether you volunteered, overpaid or underpaid. "

The successful cafés not only address hunger and food insecurity but also become necessary parts of their neighborhood—whether it's a place to learn skills or hear live music. Some teach cooking to seniors; some offer free used books. Eating or working there is a reminder that we are all in this world together.

My 10 am～1pm shift at World Healthy Café began with the café manager—one of the two paid staff members. Our volunteer crew wasn't the most orderly, but we managed to prepare and serve meals with a lot of laughs in between. At the end of my shift, I ordered my earned meal at the counter, together with other volunteers. After lunch, I walked out the door, with a handful of new friends, music in my head and a satisfied belly and heart.