What do you often do when you wait for a bus or a train at the station?

    Tom arrived at the bus station quite early for Paris bus. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in line, others were walking around. There was a group of schoolgirls. The teacher was trying to keep them in line. Tom looked around but there was no place for him to sit.

    He walked into the station cafe. He looked up at the clock there. It was only twenty to twelve. He found a seat and sat down before a large mirror on the wall. Just then, Mike, one of Tom's workmates, came in and sat with Tom. "What time is your bus?" asked Mike. "There's plenty of time yet," answered Tom. "Well, I'll get you more tea then," said Mike.

    They talked while drinking. Then Tom looked at the clock again. "Oh! It's going backward!" he cried. "A few minutes ago it was twenty to twelve and now it's half past eleven."

    "You're looking at the clock in the mirror," said Mike. Tom was so sad. The next bus was not to leave for another hour. Since then Tom has never liked mirrors.

    Many people wrongly think that cities don't have farms and fruits and vegetables are only grown in the country. Believe it or not, there are more urban farms popping up in cities all over the world.

    Alexandra Sullivan, a food systems researcher in New York, studies urban agriculture. Urban agriculture is another name for farming and gardening in a city environment. Ms. Sullivan studies everything from tiny gardens in empty lots between buildings to bigger fields that have been planted and grown. According to Ms. Sullivan, “Urban agriculture has existed since cities have, across the world.”

    The number of humans living in urban areas, or cities, is increasing. The amount of people who wanted to garden in urban areas is also rising. Ms. Sullivan says, “In small gardens, on rooftops and indoors, city residents grow fruits, vegetables, grains, and herbs, and raise animals to produce milk, eggs, honey, and meat. City residents use these foods as supplements to food produced by rural agriculture.” Even though some people who live in urban areas grow crops, urban residents still need to rely on food grown in rural areas. This is because a city doesn't have enough space to grow enough food for everyone living in it.

    In New York City, urban farmers have come up with many different ways to grow their own produce, even though there isn't a lot of room. For example, Brooklyn Grange is a farming operation that has two rooftop vegetable farms in New York City. All together, the farms are made up of 2.5 acres of rooftop space. This makes Brooklyn Grange one of the largest rooftop farming operations in the world.

    Brooklyn Grange grows all kinds of things. The farming company sells its vegetables to local residents and restaurants. And because the farms are on rooftops, they are specially adapted to their urban location. They use available space that is not needed for anything else. As more urban farmers find ways to grow food in cities, urban residents will be better able to get fresher materials for their meals.

    It's apparently become a trend in schools around the world to ban students from using the term, “best friends,” according to psychologist Dr. Barbara Greenberg. The movement, which is believed to have started in Prince George's school in South London, isn't intended to discourage close friendships, but rather encourage a wider friend group, Greenberg says.

    “Let's face it. You can't ban somebody from having a close relationship, and you can't really ban somebody from having a best friend but what the schools are trying to do is foster the idea of kids having more than a single friend,” Greenberg said.

    The idea is to increase the number of interactions a student may have with different members of his or her peer group. “I see kids come in all week long who are feeling awful because they are either nobody's best friend or their best friend has moved on,” Greenberg says.

    Jay Jacobs, who operates Timber Lake Camp in New York, stresses the downside of not fostering multiple relationships at a young age, for exactly that reason. “I think that there are problems in just having one friend,” Jacobs says. “Remember as you grow up, interests change, and children go in different directions.” Jacobs adds that teachers at Timber Lake, which changes positions between Glen Cove in winter and Shandake in summer, have made it a point to promote a more inclusive environment for years.

    Jacobs reminds people that, “As you grow up, interests change, and children go in different directions,” so having only one friend can be risky. He holds the belief that children will be better set up for success later in life if they get used to having a wider friend group at a young age. “It's about promoting kindness, looking to children to be kind to one another and to be aware of what it looks like when you're not,” Jacobs says.

A huge lake of salty water appears to be buried deep in Mars, scientists reported this week. The presence of water raises the chances of finding life on the red planet. The discovery is based on observations by a European spacecraft. It has excited experts. Water is necessary for life, and scientists have long hoped to prove that it is present on Mars.

Cassie Stuurman is a geophysicist at the University of Texas. In 2016, she found evidence of a huge ice deposit(沉积)on Mars. “If these researchers are right, this is the first time we've found evidence of a large water body on Mars. ”Stuurman said. Researchers are not yet sure how deep the area of water is. So, they cannot say whether it is an underground pool, or just an area of soft and wet soil.

In order to find the water, Italian researchers examined radar signals. The signals were collected over three years by the European Space Agency's Mars Express spacecraft. The results suggest that a 20-kilometer-wide water body lies below ice that is 1.5 kilometers thick. They believe the area is close to the planet's southern pole.

    Mars is very cold, but salt in the water may have kept it from freezing. It is the same as when you put salt on a road to prevent ice from forming. The water would be extremely cold, right at the point where it's about to freeze. And it would be salty. Such conditions are not ideal for life to form. But, she said there are bacteria on the earth that have been able to survive in similar conditions.

Mars has been a popular planet for exploration, with some groups placing instruments on its surface and others examining it from space. In May, NASA launched another spacecraft, the InSight Mars lander which will dig deep into the data under the surface after it reaches a flat area of the planet in November.

    The big fire in April that tore through the Notre Dame Cathedral in Paris(巴黎圣母院) is still fresh in people's minds. The 800-year-old landmark suffered great damage to its top, but thankfully the most valuable religious relics and cultural treasures were undamaged.

    So a US publishing company GoArchitect organized the People's Design Competition to invite designers, worldwide to share their ideas of rebuilding the French landmark. The open call attracted more than 200 proposals from 56 countries and regions. In the end, Chinese architects Cai Zeyu and Li Sibei won the competition with their striking design. They are both the post-90s generation.

    Named "Paris Heartbeat", the design replaces the old top with a kaleidoscope(万花筒) of multifaceted mirrors, which is combined with a mirror roof, reflecting the ever–changing urban environment.

    The kaleidoscope is the floating "time capsule", at the top using magnetic levitation(磁悬浮) technology, which is meant to open every half century. The "time capsule" moves up and down, breathing and beating together with the city.

    "I believe that the 'time capsule' can be achieved with present technology," Cai told the Global Times.

    The pair hoped that their design, Paris Heartbeat, could meet people's high expectations for the rebuilding. As Cai and Li told GoArchitect, "Notre Dame witnessed Parisian history. It burns, survives and co-breathes with the ever-changing world…The 2019 fire will mark a new era."

    Though people still don't know what kind of design the French government will choose, it's clear that people around the world hope that the lost beauty of Notre Dame will come back. Once rebuilt, it will certainly become a permanent part of history and the Parisian skyline again.

When I first heard about the improv(即兴表演) classes, I was torn. As an introvert, I feared getting on stage and improvising in front of strangers. However, I knew I wanted to work as a science communicator after finishing my Ph.D. , so it seemed like the perfect opportunity to improve my speaking ability and gain confidence thinking on my feet.

During our first class, we learned a core concept of improv: "yes, and." It means that, as improvisers, we accept what fellow performers say. If someone says that rhinos(犀牛) are librarians, for example, then rhinos are librarians. We do not question the logic; we say "yes" and continue with the scene as if no him is wrong.

I got a taste of how difficult that was when acting out my first scene. My classmate turned to me and said, "Mom is going to be so mad." Mad about what? My mind spun out ideas, and my inner critic shot them all down. We broke the car? No, that's too easy. We failed a test? No, you don't want your classmates thinking you're stupid on the first day. I finally landed on an answer: "Yes, we're going to be late for dinner." The scene proceeded from there, and we eventually finished as two sisters who lost their way on a hiking trail.

The first few scenes were hard, but as weeks turned into months, I became more comfortable thinking on my feet and even started to enjoy our classes. I never silenced my inner critic entirely, but over time, I didn't police my words with quite so much effort. I also became better at listening, relating to my conversation partners, and communicating clearly in the moment.

That training proved useful 6 months ago, when my experiments generated unreasonable data. Early on in graduate school, I would get stuck when this happened; my inner critic would assume I had made a mistake. But then, after embracing the "yes, and" concept, instead of getting discouraged, I kept exploring the data and ended up identifying a new type of cell—one that wasn't behaving as expected. If I hadn't accepted the possibility that the results were real, I would have missed out on the most exciting finding of my Ph.D. so far.

All scientists can benefit from this lesson. If the data say rhinos are librarians, then it's worth investigating whether rhinos are, in fact, librarians. Our job as scientists isn't to generate data that support a preconceived(预想的) story. Our job is to say "yes, and."