Scientists found that sleeping considerably improves our creativity. After taking a nap people are able to think faster and put more imagination into their thinking. Besides, if we dream, the thinking abilities are improved even more.

    Researchers consider that sleeping on a problem in most cases leads to elucidation(解释). They say when a person enters a phase called Rapid Eye Movement (REM) during sleep, it increases the effect. Such phase takes place right before we awake and according to scientists it helps our brain make links between unrelated subjects.

    In the study, led by Professor Sara Mednick, scientists made a conclusion that the REM was "important for assimilating(消化) new information into past experience" in order to find solutions to creative problems.

    Prof. Mednick is a psychiatrist at the University of California. Her study involved the analysis of 77 adults. Each participant was given several word-associated creative tasks. All tasks were given in the morning, with participants being shown a number of groups of 3 words, for example: cookie, heart and sixteen. They were asked to come up with a word that would be associated with all three given terms—like sweet. Sometime later, after some participants were allowed to sleep, they were asked to perform the same tasks and some new ones. It is worth mentioning that while some people slept, researchers used brain scans to see the type of sleep each participant entered.

    When given the same tasks, participants, who took a nap, were able to give more varied solutions, some of which were much better than they gave earlier. But when given new tasks, researchers found that those who entered REM sleep had a 40 percent better result compared to the performance they showed in the morning.

    For the Travel section, writers and editors selected special items to profile from a dozen cities.

Brussels:Chocolate

    Nearly half the chocolate consumed in the world is eaten in Europe, and Belgium—with average consumption of 14.99 pounds per person a year—certainly covers its fair share. While Brussels, the country's capital, is home to hundreds of chocolate makers, what makes a visit necessary is the rich heritage of traditional chocolate makers.

Budapest: Paprika (红辣椒)

    The job of preparing Hungarian paprika was once considered too dangerous for mothers to do. A woman who touched her children upon returning from work risked burning them, so only the elderly and unmarried were allowed the delicate task of separating the skin from the flesh. But by the early 20^th century, sweeter varieties and a machine turned paprika into a common feature of all Hungarian cuisine.

Lisbon: Tiles (瓷砖)

    Is there a bluer Country than Portugal? The blue sky and Atlantic Ocean embrace the land. The blue moods of Fado, the dark folk music, form the national soundtrack. And all across Portugal, the typically blue designs of azulejos—ceramic tiles—are spread across churches, castles, palaces, university halls, parks... The result is a beautiful land of Christian saints, Portuguese kings, historical glories, aristocrats at leisure, seascapes and so on.

Madrid: Guitars

    Walking into one of Madrid's storied guitar makers' workshops can feel like stepping into the past. Curly wood shavings, from the palest pine to ebony, fall onto the floor as artisans turn some humble wood into works of art. It's painstaking work—all done by hand—with classical guitar models and the methods of making them changing little over the last century.

    People are compassionate. With effort, we can translate compassion into action. An experience last weekend showed me this is true. I work part-time in a supermarket across from a building for the elderly. These old people are our main customers, and it's not hard to lose patience over their slowness. But last Sunday, one aged gentleman appeared to teach me a valuable lesson. This untidy man walked up to my register (收款机) with a box of biscuits. He said he was out of cash, had just moved into his room, and had nothing in his cupboards. He asked if we could let him have the food on trust. He promised to repay me the next day.

    I couldn't help staring at him. I wondered what kind of person he had been ten or twenty years before, and what he would be like if luck had gone his way. I had a hurt in my heart for this kind of human soul, all alone in the world. I told him that I was sorry, but store rules didn't allow me to do so. I felt stupid and unkind saying this, but I valued my job.

    Just then, another man, standing behind the first, spoke up. If anything, he looked more pitiable. “Charge it to me,” was all he said.

    What I had been feeling was pity. Pity is soft and safe and easy. Compassion, on the other hand, is caring in action. I thanked the second man but told him that was not allowed either. Then I reached into my pocket and paid for the biscuits myself. I reached into my pocket because these two men had reached into my heart and taught me compassion.

    How do the world's only flying mammals communicate? Researchers have observed young bats adopting new “dialects” simply by hearing them repeatedly, making them one of the few animals known to have a capacity for vocal (声音的) learning. “These bats may help us clarify the evolution of speech acquisition (习得) skills,” says Yosef Prat, a PhD at Tel Aviv University (TAU).

    For one year, researchers raised 14 Egyptian fruit bat pups with their mothers in controlled area, exposing each young bat to two different vocalizations: the natural call of its mother and a separate recording that varied in pitch (音高) or frequency. They found that the pups in each group developed a dialect like the recording. “The general assumption in this field is that most animals develop their born vocalizations regardless of what they hear, and that human vocal learning abilities have developed during evolution,” says Mr Prat. “The finding that bats learn the common dialect in their rest place was unusual.”

    Scientists know little about the origin of spoken language, which is believed to have appeared in humans within the past 500,000 years. Dozens of theories attempt to explain the complexity of this skill, but none have done so conclusively.

    “Studying vocal communication and vocal learning in animal models is a very useful way to approach the problem,” says Olga Feher, an assistant professor at the University of Warwick in England.

    But animal vocalizations and human speech are very different things, says Jamin Pelkey, a professor at Ryerson University. “All species communicate. Unlike other animals, though, human beings are able to use sound patterns for functions that are far stranger—functions that are imaginative, theoretical, and critical. When speech is involved in these stranger functions, that is what we mean by spoken ‘language'.”

    Television in the United States is free. To pay for programs, there are many advertisements. Often these advertisements are short plays with actors. The following television advertisement is like many others that Americans see daily.

    We see a man and his wife at the breakfast table. They have been married for a long time. They are not speaking to each other. They haven't spoken to each other at the breakfast table for years. The husband is reading his newspaper. We can't see his face. The wife looks very bored as she pours a cup of coffee for him. Today, she is using a new kind of coffee for the first time. The husband picks up his cup. He isn't very interested. He tastes his coffee. Suddenly he puts down his newspaper. Something is different. Can it be the coffer? He takes another taste. It's wonderful. He smiles. He looks at his wife and says in amazement, “Doris, when did you cut your hair?” Doris is pleased. She answers, “Two months ago.” Doris asks, “Herbie, when did your hair begin to turn grey?” He replies, “A long time ago.” Doues says, “Oh, very handsome.” Now they aren't bored anymore. Breakfast is different. Having a new kind of coffee changed their lives.

    The Top 4 Restaurants of 2018

    No. 4

    Kuya Ja's Lechon Belly (4 stars): 5268-H Nicholson Lane, Rockville, Md. 240-669-4383. kuyajas. com.

    Open: Breakfast, lunch and dinner Wednesday through Monday; breakfast and lunch Tuesdays.

    Prices: Sandwiches, bowls and combination meals, $ 6.99-$ 12.59.

    Sound check: 74 decibels（分贝）/ Must speak with raised voice.

    No. 3

    Little Havana（41/2 stars): 3704 14th St. NW. 202-758-2127. littlehavanadc.com.

    Open: Dinner daily.

    Prices: Sandwiches and mains $ 9-$ 25.

    Sound check: 70 decibels / Conversation is easy.

    No. 2

    Three Blacksmiths (41/2 stars): 20 Main St., Sperryville, Va. 540-987-5105. Three black smiths.com.

    Open: Dinner Thursday—Saturday.

    Prices: Small plates $ 5 - $ 20, large plates and family-style plates $ 24 - $ 94.

    Sound check: 81 decibels / Extremely loud.

    No. 1

    Momofuku（5 stars): 1090 I St. NW. 202-602-1832. ccdc.momofuku.com.

    Open: Lunch Monday through Friday, dinner daily, breakfast Saturday and Sunday.

    Prices: Small plates $ 5 - $15.

    Sound check: 75 decibels / Must speak with raised voice.