You dash through a crowded railway station, tripping over bags, spilling (泼出) your coffee, only to have the doors slide shut in your face, leaving you breathless on the platform as the train pulls away,

    But at least, if you're in France, someone may be playing the piano for you. But it won't be performed by a paid musician, or even a street entertainer playing for coins. It will just be a random passer - by, jamming for the fun of it on one of the pianos that the national railroad company, S. N. C. F., has fixed in nearly 100 stations across France. They are free for anyone to play, and travelers from all walks of life have taken to doing just that.

    Gares & Connexions, the S. N. C. F. division that manages its stations, rents the instruments from the producer, Yamaha: which maintains them and tunes them every month or two. The first one was set up in the Gare Montparnasse in Paris in 2012.

    The music, mixed with the sounds of shouting passengers, screaming trains and rolling suitcases, gives French stations a special soundscape. The amateur musicians have included Irish soccer fans and even babies. In 2014, Gares & Connexions and Yamaha organized a nationwide contest called Your Turn to Play, asking participants to submit videos of themselves using one of the pianos. It drew nearly 900 entries.

    Isn't the railroad company taking a big chance? Apparently not: “None of the instruments has been vandalized to this day, or even merely damaged,” said Claire Foumon, a spokeswoman for Gares & Connexions. “They are shared and respected by all.”

    So if you miss a train in Paris; Bordeaux or Marseille one day, perhaps someone will be playing a favorite piece that will ease your pain. Or perhaps you'll sit down and play your annoyance away yourself.

    In China, Major Cold (大寒) is the last solar term in winter and also the last solar term in the annual lunar(阴历的) calendar. In this period, snow, rain and icy cold weather have a big influence on people's lives.

    Here are several things you should know about Major Cold.

    Eating "dispelling cold cake" (吃"消寒糕")

    During Major Cold, people in Beijing have a habit of eating "dispelling cold cake", a kind of rice cake. Sticky rice, the cake's main ingredient, contains more sugar than rice, which can make people feel warm all over their bodies. In Chinese the word "rice cake" has the same pronunciation with the word "higher in a new year", which symbolizes good luck and continual promotion.

    Eating fried spring roll（吃春卷）

    In Anqing of Anhui province, people traditionally eat fried spring rolls during Major

    Cold. They use a round, cooked, thin pancake to wrap stuffing（馅料）in a thin roll. Then it is fried in a pan with oil until it turns yellow and floats to the top. The stuffing inside the spring roll contains meat or vegetables and the flavor can be salty or sweet.

    Drinking stewed soup

    People in Nanjing of Jiangsu province like to drink stewed soup during Major Cold, which can make people feel warm from head to foot. They always stew the aged hen soup with ginseng(人参), matrimony vine(枸杞) and black fungus(黑木耳).

    Doing winter sports

    There is a saying that goes, "Dripping water freezes during Minor and Major Cold." In various regions of China, Major Cold is the perfect time for winter sports such as skiing, ice skating and sledding.

Open water swimming

    I had only swum in open water a few times, and always in gentle lakes, so I wasn't prepared for how rough Lake Windermere appeared on a cold day. A swimmer told me the water felt colder than it had been measured, and that the water was a bit rough. But I, along with 10,000 others, was about to complete the challenge.

    Most of the people taking part were doing a one-mile race, and 10 races were planned over the weekend. There seemed to be a mix of open-water enthusiasts alongside complete beginners—which is precisely the aim of the swims, to get as many people as possible completing their own challenge. The oldest woman competing was 77, taking part in the two-mile race, alongside a man who last year had swum in every one-mile race.

    I had chosen the third one-mile race of the day. There were over 600 people in my race. We were taken through an acclimatization area  a children's paddling pool-sized part of the lake where we moved in to feel how cold the water was. "Not too bad" was everyone's thought! Then we headed out towards the middle of the lake.

    We'd been warned that the first 100 metres would be really rough. However, somewhere near the 750m mark I was still waiting for the calm; it felt more like swimming in the sea than a lake. I tried to focus on my breathing and technique, and just keep going. As I approached the 400m-to-go mark my lower right leg became painful. I recalled overhearing people talking about how they kept swimming through the pain, so I tried. But it didn't work. I began to feel the entire leg tight and painful. I didn't want to stop, so I bent my right knee and just kicked with the left leg.

    Finally I saw the finishing post, and I just concentrated on getting there—still one-legged. My finishing time was 38 minutes 25 seconds but that didn't matter—the atmosphere was fantastic and everyone felt a sense of achievement, whatever their time. I'm hooked, and want to give it another go. I've already signed up for my next open-water swim.

    When one tried to unify gravity with quantum mechanics (量子力学), one had to introduce the idea of 'imaginary' time. If one can go forward in imaginary time, one ought to be able to turn round and go backward. This means that there can be no important difference between the forward and backward directions of imaginary time. Yet there is a big difference between the forward and backward directions of 'real time' in ordinary life. Imagine a cup of water falling off a table and breaking into pieces on the floor. If you take a film of this, you can easily tell whether it is being run forward or backward. You can tell that the film is being run backward because this kind of behavior is never observed in ordinary life.

    The explanation that is usually given as to why we don't see broken cups gathering themselves together off the floor and jumping back onto the table is that it is forbidden by the second law of thermodynamics (热力学). This says that in any closed system disorder, or entropy (熵), always increases with time. In other words, it is a form of Murphy's law: things always tend to go wrong! An intact cup on the table is a state of high order, but a broken cup on the floor is a disordered state. One can go readily from the cup on the table in the past to the broken cup on the floor in the future, but not the other way round.

    The increase of disorder or entropy with time is one example of what is called an arrow of time, something that tells the past from the future, giving a direction to time. There are at least three different arrows of time. First, there is the thermodynamic arrow of time, the direction of time in which disorder or entropy increases. Then, there is the psychological arrow of time. This is the direction in which we feel time passes, the direction in which we remember the past but not the future. Finally, there is the cosmological arrow of time. This is the direction of time in which the universe is expanding rather than contracting.

The Kids' Farm

    While kids visit vegetable plots and animal contact areas, they will learn that most of the food we eat every day comes from farms, and that taking care of animals takes time, commitment and knowledge.

    Kids can see our cows, donkeys, goats, alpacas, pigs, etc. and learn all about looking after farm animals. At the Caring Corral, they will have a chance to touch cows and donkeys, under staff members' supervision.

    Please Note:

    ●Any time you touch an animal, there is a risk of spreading germs (细菌). Visitors to the Kids' Farm should wash their hands after touching the animals.

    ●The Caring Corral is open only when the staff are available; hours are limited.

    ●The Kids' Farm uses pizza to teach kids how many kinds of food grow. Hands-on exhibits show how pizza ingredients go from the farm to the pizza. The Pizza Garden has slice-shaped plots of growing ingredients, including tomatoes, wheat and herbs.

    ●The 22-foot-wide Giant Pizza gives kids a place to play with oversized toppings and each other.

    ● During the busier season (beginning in June), a free shuttle picks up visitors in need of a lift at the Kids' Farm and drops them off at the Panda Plaza/the Bus Lot from 11 a. m. to 6 p.m.

    Spending money on time-saving services reduces stress and boosts(增进）happiness, according to a new research, but shockingly, few of us do it.

    Whillans, a professor at HBS said, "Buying time helps to protect us from the stress in our lives caused by time pressure, and the feeling that we don't have enough minutes in the day to complete our tasks."

    The effect was clearest in the Canadian experiment, in which 60 working adults were given $40 to spend in two different ways. One weekend, they were told to spend the money on a material purchase—a gift for themselves. The next weekend, they were instructed to spend the $40 on anything that saved them time, from paying the neighbor ' s kid to run errands (跑腿）to taking an Uber instead of a bus.

    〇n the day they made the time-saving purchase, they felt happier, in a better mood, and lower feelings of time stress than on the day they bought a material purchase," said Whillans.

    The biggest surprise to the researchers was how few people would spend money on time-saving services. When they asked 98 working adults how they would spend a "windfall" of $40, only two percent named a purchase that would save them time.

    "One reason," said Whillans, is that we're very bad at remembering how much we hate doing certain tasks once the suffering has passed. That makes us less likely to take active steps to avoid that overburdened feeling in the future. "But another possible cause is good old-fashioned guilt." If you feel guilty about getting someone to clean your house for you, then you might get less happiness from outsourcing (夕卜包）that task," said Whillans, "or you might just be less likely to spend your money in that way."