A warm drink of milk before bed has long been the best choice for those wanting a good night's sleep. But now a study has found it really does help people nod off-if it is milked from a cow at night.

    Researchers have discovered that “night milk” contains more melatonin(褪黑激素), which has been proven to help people feel sleepy and reduce anxiety.

    The study, by researchers from Seoul, South Korea, involved mice being fed with dried milk powder made from cows milked both during the day and at night.

    Those given night milk, which contained 10 times the amount of melatonin, were less active and less anxious than those fed with the milk collected during daytime, according to the study published in The Journal of Medicinal Food.

    Night milk quickened the start of sleep and caused the mice to sleep longer.

    While the effect of cows milk harvested at different time has not been tested on humans up to now, taking melatonin drugs has been suggested to those who are struggling to fall asleep at night.

    Previous studies have also indicated that milk can be excellent for helping sleep because of the calcium content, which helps people to relax.

    Milk is also sugar-free and additive-free with nutritionists recommending skimmed milk as the best choice before bed as it is the least fattening. The more fat you take in before bedtime, the greater burden you will put on your body at night.

    While residents of wealthy nations tend to have greater life satisfaction, new research shows that those living in poorer nations report having greater meaning in life.

    These findings, published in Psychological Science, a journal of the Association for Psychological science, suggest that meaning in life may be higher in poorer nations as a result of greater religiosity (笃信宗教). As countries become richer, religion becomes less central to people's lives and they lose a sense of meaning in life.

    “Thus far, the wealth of nations has been almost always associated with longevity, health, happiness or life satisfaction,” explains psychological scientist Shigehiro Oishi of the University of Virginia. “Given that meaning in life is an important aspect of overall well-being, we wanted to look more carefully at differential patterns, correlates (相关物), and predictors for meaning in life.”

    Oishi and colleague Ed Diener of the University of Illinois at Urbana-Champaign investigated life satisfaction, meaning, and well-being by examining data from the 2007 Gallup World Poll, a large-scale survey of over 140,000 participants from 132 countries. In addition to answering a basic life satisfaction question, participants were asked: “Do you feel your life has an important purpose or meaning?” and “Is religion an important part of your daily life?”

    The data revealed some unexpected trends: “Among Americans, those who are high in life satisfaction are also high in meaning in life,” says Oishi. “But when we looked at the societal level of analysis, we found a completely different pattern of the association between meaning in life and life satisfaction.”

    When looking across many countries, Oishi and Diener found that people in wealthier nations were more educated, had fewer children, and expressed more individualistic attitudes compared to those in poorer countries — all factors that were associated with higher life satisfaction but a significantly lower sense of meaning in life.”

    The data suggest that religiosity may play an important role: Residents of wealthier nations, where religiosity is lower, reported less meaning in life and had higher suicide rates than poorer countries.

    According to the researchers, religion may provide meaning to life to the extent that it helps people to overcome personal difficulty and cope with the struggles of working to survive in poor economic conditions:

    “Religion gives a system that connects daily experiences with the coherent whole (连贯的整体) and a general structure to one's life … and plays a critical role in constructing meaning out of extreme hardship,” the researchers write.

    Oishi and Diener hope to reproduce these findings using more comprehensive measures of meaning and religiosity, and are interested in following countries over time to track whether economic prosperity gives rise to less religiosity and less meaning in life.

    When her five daughters were young, Helene An always told them that there was strength in unity (团结). To show this, she held up one chopstick, representing oneperson. Then she easily broke it into two pieces. Next, she tied several chopsticks together, representing a family. She showed the girls it was hard to break the tied chopsticks. This lesson about family unity stayed with the daughters as they grew up.

    Helene An and her family own a large restaurant business in California. However, when Helene and her husband Danny left their home in Vietnam in 1975, they didn't have much money. They moved their family to San Francisco. There they joined Danny's mother, Diana, who owned a small Italian sandwich shop. Soon afterwards, Helene and Diana changed the sandwich shop into a small Vietnamese restaurant. The five daughters helped in the restaurant when they were young. However, Helene did not want her daughters to always work in the family business because she thought it was too hard.

    Eventually the girls all graduated from college and went away to work for themselves, but one by one, the daughters returned to work in the family business. They opened new restaurants in San Francisco and Los Angeles. Even though family members sometimes disagreed with each other, they worked together to make the business successful. Daughter Elisabeth explains, "Our mother taught us that to succeed we must have unity, and to have unity we must have peace. Without the strength of the family, there is no business."

    Their expanding business became a large corporation in 1996, with three generations of Ans working together. Now the Ans' corporation makes more than $20 million each year. Although they began with a small restaurant, they had big dreams, and they worked together. Now they are a big success.

    The Bazaar of Bad Dreams

    Author: Stephen King

    US author Stephen King is well-known for creating contemporary horror, supernatural fiction and science fiction stories. His latest book delivers a generous collection of stories with hidden connections. The master storyteller also includes insight into why and how he came to write them.

    Magnus Chase and the Gods of Asgard

    Author: Rick Riordan

    A troubled kid named Magnus Chase has lived alone on the streets of Boston since his mother's mysterious death. His life changes when he meets Uncle Randolph, a man his mother warned him about. Randolph reveals that Chase is the son of a Norse god. Chase is then tasked with searching for a lost weapon to save the world from monsters.

    Little Victories: Perfect Rules for Imperfect Living

    Author: Jason Gay

    There are always moments in our lives when we feel doomed（注定） to be imperfect. In this collection of humorous essays，Wall Street Journal columnist Jason Gay tells us that, when we mess things up，we should just give ourselves a break and celebrate the things we did right.

    Thing Explainer: Complicated Stuff in Simple Words

    Author: Randall Munroe

    Have you ever been puzzled by complex terminology (术语）？ Has it prevented you from learning about science? This fascinating book provides simple explanations and line drawings to explain essential science concepts. The book's author is the man behind the popular science blog -- What If.

    My senior year of high school was a very hectic one, to say the least. If I wasn't studying or worrying about my grades, I was working on after-class activities. It seemed as if my life had turned into one crazy cloud of confusion and I hoped to find some sort of direction.

    Finally, I got a part-time job at the local coffee shop. I had thought it would be easy and, for the most part, stress-free. I pictured myself pouring coffee and becoming close friends with my customers.

    What I hadn't expected was the people with so many orders. There were moments when I was very angry simply because I couldn't seem to please anyone. There was always too much sugar, too little ice, or not enough skim milk. However, I kept at it.

    One day, one of my customers came in, depressed. Before he left, I handed him a bag along with his iced coffee. He looked at me questioningly because he hadn't ordered anything but the coffee. He opened the bag and saw his favorite doughnut (甜甜圈) I had given him. He smiled and thanked me before heading out into the rain.

    The next evening, he came. Instead of ordering something, he handed me a single pink rose and a note.

    “Thanks for being so sweet and thoughtful yesterday. It is so nice to meet someone who's warm and unselfish. Please don't change your ways because I truly believe that you will do better. Have a great day!”

    As time went on, I did come across some customers really particular. But anytime I felt depressed, I thought of that man and his kindness. Then I would smile, hold my head up high, clear my throat and ask politely, “How can I help you?”

    Most groups of plants and animals are richer in species and more plentiful near the equator. In the ocean, that holds true for cold-blooded predators(掠食者). But warm-blooded predators are more diverse toward the poles and noticeably missing from several warm hot spots. Why?

    John Grady, an ecologist, and his team considered the possibility—warm-blooded animals need a lot to fuel their metabolism(新陈代谢). Perhaps colder waters are just richer in small fish? But they found that at higher, colder places, there isn't actually much more food around. It's more that warm-blooded animals are eating a much bigger share of it than their cold-blooded competitors.

    The real explanation is simple. An animal's speed, swiftness, and intelligence depend on its metabolism, which in turn depends on its temperature. Since birds and mammals can keep heating their bodies in icy conditions, they remain fast and attentive. By contrast, the fish they hunt become slower and duller. At some tipping point of temperature, seals, dolphins, and penguins start out swimming their prey(猎物). They become more likely to come upon targets and outpace the cold-blooded predators of their own.

    In Grady's words, "Warm-bodied predators are favoured where preys are slow, stupid and cold." That's why sharks and other predatory fish dominate near the equator, but colder waters are the kingdom of whales and seals. By keeping food to themselves in the poles, these creatures can then specialize on specific types of prey, which makes them more likely to split into separate species. The killer whales of the North Pacific, for example, include mammal-eating transients and fish-eating, year-round residents.

    But the world is changing. It's likely that the surface of the oceans will warm by 2 to 3℃ within this century. Grady's team estimates that every time the ocean's surface warms by 1℃, populations of sea mammals will fall by 12%, and populations of seals and sea lions will fall by 24%.

    But "predictions are hard," Donna Hauser from the University of Alaska Fairbanks notes. "Polar bears are losers of a warming world, but some populations are still doing well. Some groups of whales have changed the timing of their migrations; others are hunting in deeper, colder waters. These changes might make sea mammals more adaptable to changing climates. Maybe they just need to find the places where fish remain slow, stupid and cold."