1 . This question has fascinated behavioural scientists for decades: why do we give money to charity?

The explanations for charitable giving fall into three broad categories, from the purely altruisic (利他的)— I donate because I value the social good done by the charity. The “impurely” altruistic— I donate because I extract value from knowing I contribute to the social good for the charity. And the not-at-all altruistic— I donate because I want to show off to potential mates how rich I am.

But are these motives strong enough to enable people to donate as much as they would want to? Most people support charities in one way or another, but often we struggle to make donations as often as we think we should. Although many people would like to leave a gift to charity in their will, they forget about it when the time comes.

Many people are also aware that they should donate to the causes that have the highest impact, but facts and figures are less attractive than narratives. In a series of experiments, it was found that people are much more responsive to charitable pleas that feature a single, identifiable beneficiary(受益者), than they are to statistical information about the scale of the problem being faced. When it comes to charitable giving, we are often ruled by our hearts and not our heads.

The good news is that charitable giving is contagious—seeing others give makes an individual more likely to give and gentle encouragement from an important person in your life can also make a big difference to your donation decisions— more than quadrupling them in our recent study. Habit also plays a part— in three recent experiments those who volunteered before were more likely to do donate their time than those who had not volunteered before.

In summary, behavioural science identifies a range of factors that influence our donations, and can help us to keep giving in the longer term. This is great news not just for charities, but also for donors.

3 . It was a sunny afternoon in June of 2022 when 20-year-old Anthony Perry stepped off the train at Chicago’s 69th Street station. On the platform, two men were fighting bitterly. Then the unthinkable happened: the pair fell over the edge and onto the tracks. One man ended up on his back. Suddenly, he started convulsing (抽搐) unnaturally. He had fallen on the third rail, the conduit (导线管) for the 600 volts of electricity that powers Chicago’s L trains. The aggressor leaped backward, bounded back up onto the platform and disappeared.

Perry couldn’t just stand there and watch. He sat at the edge of the platform and eased himself down. He took a few quick bounds and approached the victim. The guy looked dead, his body still moving violently as the electricity pulsed (搏动). Gathering up his courage, Perry reached down and grasped the victim’s wrist. Instantly, he felt a blast of electric shock shoot through his body. Perry shrank and jumped back. He reached down a second time, and was shocked again. But the third time he seized the man’s wrist and forearm and, braving the shock, pulled with all his strength. The guy’s body slid briefly along the third rail, coming to rest on the gravel on the outer edge of the tracks.

The man was breathing, but irregularly. Something wasn’t right. “Give him chest compressions (按压)!” yelled a woman. Perry was no expert, but for a few moments he worked on the man’s heart until the victim began convulsing. Then he heard a sudden noise behind him — medical workers and firefighters had arrived. Perry let the professionals take over. His heart still racing from the electric shocks, he climbed back up onto the platform, grabbed his things and headed home.

The evening news reported the incident. After a friend outed him to the media, Perry became the toast of Chicago. Perry was then recruited by the Chicago Fire Department and is now training to be an emergency medical technician.

5 . The Mogao Grottoes were a center of Buddhist life and some of the world’s great cultures for hundreds of years. However, by the late Qing Dynasty they had been abandoned and nearly forgotten and many of the caves had become damaged by the elements. Around 1900, with the discovery of a library of thousands of ancient documents, the caves received new interest from Chinese and foreign researchers. Unfortunately, this resulted in tens of thousands of items from the caves being taken to foreign museums

In the 1940s, many researchers and artists visited the area to study traditional Chinese art. Copies of some of the artwork painted by respected artists such as Zhang Daqian and GuanShanyue helped people all over the country learn about Dunhuang. These artists were also inspired by the artwork they saw in the caves and it began to influence their painting styles. Others staved in the desert for much longer, Chang Shuhong stayed for the rest of his life — struggling to record the cultural treasures and protect them from the weather. As a result of their efforts the Dunhuang Academy was formed to protect and study the Mogao Grottoes.

In 1987, the Mogao Grottoes were named a UNESCO World Heritage Site. While the caves are open to the public, access is now limited in order to protect the artwork. However, the caves can be seen online in digital form so that people around the world can study and enjoy them.

Despite its remoteness, the Mogao Grottoes continue to draw visitors. And just as the sand and desert have survived largely unchanged through the centuries, this small art gallery in the desert has also survived largely unchanged providing an amazing look at a world long ago past.

6 . This week, Google researchers published a paper describing results from an AI tool built to create music. The tool, called MusicLM, is not the first AI music tool to be launched. But the examples Google provided demonstrate musical creative ability based on a limited set of descriptive words.

Several different music examples produced by MusicLM were published online. Some of the generated music came from just one- or two-word descriptions, such as “jazz”, “rock” or “techno (高科技舞曲)”. The tool also created other examples from more detailed descriptions containing whole sentences.

In one example, Google researchers included these instructions to MusicLM, “It is a soundtrack of a game. It is fast-paced and upbeat, with a catchy electric guitar riff (反复乐节). The music is repetitive and easy to remember, but with unexpected sounds ...” In the resulting recording, the music seemed to keep very close to the description. The team said the more detailed the description was, the better the system could attempt to produce it.

The MusicLM model operates similarly to the machine-learning systems used by ChatGPT. ChatGPT and MusicLM both require powerful computers to operate complex machine-learning models. The San Francisco-based company OpenAI launched ChatGPT late last year. ChatGPT has recently received a lot of attention because of its ability to generate complex writings and other content from just a simple description in natural languages. Such tools can produce human-like results because they are trained on huge amounts of data. Many different materials are fed into the systems to permit them to learn complex skills to create realistic works.

However, the MusicLM researchers said there were some risks linked to the new tool. One of the biggest issues the researchers identified was biases (偏好) present in the training data. A bias might be including too much of one side and not enough of the other. The researchers said this raised a question about appropriateness for music generation for cultures underrepresented in the training data.

7 . A recent study conducted by the National Collegiate Athletic Association (NCAA) showed that while sportsmanship among players has improved over the years, sportsmanship in the fans and parents has reduced. It has always interested me why people in the stands often feel they have invested more than the actual participants. Is it the time and money invested into private lessons and travel teams? Is it the college scholarship we need our children to earn? Is it the fear of seeing our kids fail? In any event, we, as parents and fans, should all take a step back and determine if we are helping our kids, or undermining the experience.

As a father of four kids who enjoys participating in athletics, I have to remind myself that it is okay when my kid misses a shot, strikes out, or doesn’t play good enough defense. That fact is, it is their game and their experience, and my playing days are over. A good reminder for me when I feel that my kid needs my advice from the stands comes from the great John Wooden, basketball player and head coach at the University of California at Los Angeles. He once said, “Young people need models, not critics (批判者) .”

Instead of being upset with what my kid is not doing well, or how an official has “cheated” our team, I should focus on helping my kid learn to respect the other team. I should watch my language and the negative comments that could come from my mouth. I should respect the officials and not argue every call that is made. Perhaps most importantly, I should support my kids’ team, win or lose.

Life is tough, and life is not fair. Like life, sports are tough and not always fair. Yet sports can be a wonderful training ground for life’s challenges. Just like we win some and lose some in sports, we also deal with plenty of successes, challenges and failures in our lives. Let’s try to be good sports in both the winning and losing situations and during our successes, challenges and failures.

10 . Living in a city is a well-known risk factor for developing a mental disorder, while living close to nature is largely beneficial for mental health and the brain. A central brain region, the amygdala (大脑杏仁核) involved in stress processing, has been shown to be less activated during stress in people living in rural areas, compared to those who live in cities, hinting at the potential benefits of nature. “But so far the hen-and-egg problem could not be resolved, namely whether nature actually caused the effects in the brain or whether the particular individuals chose to live in rural or urban regions,” says Sonja Sudimac.

To achieve causal evidence, the researchers from the group examined brain activity in regions involved in stress processing in 63 healthy volunteers before and after a one-hour walk in Grunewald forest or a shopping street with traffic in Berlin. The results revealed that activity in the amygdala decreased after the walk in nature, suggesting that nature elicits beneficial effects on brain regions related to stress.

“The results support the previously assumed positive relationship between nature and brain health, but this is the first study to prove the causal link. Interestingly, the brain activity after the urban walk in these regions remained stable and showed no increases, which argues against a commonly held view that urban exposure causes additional stress,” explains Simone Kühn, head of the group.

The authors show that nature has a positive impact on brain regions involved in stress processing and that it can already be observed after a one-hour walk. This contributes to the understanding of how our physical living environment affects brain and mental health. Even a short exposure to nature decreases amygdala activity, suggesting that a walk in nature could serve as a preventive measure against developing mental health problems and reducing the potentially disadvantageous impact of the city on the brain.

In order to investigate beneficial effects of nature in different populations and age groups, the researchers are currently working on a study examining how a one-hour walk in natural versus urban environments impacts stress in mothers and their babies.