Beautysleep is a real thing, researches have shown that people who have enough sleeplook more attractive (有魅力的) to others.

    A few badnights are enough to make a person look especially "more ugly", theirsleep experiments show.

    Theresearchers asked 25 university students to join in their sleep experiment.They were asked to get a good night's sleep for two nights.

    A weeklater, they were asked to sleep for only four hour every night for two nightsin a row. The researchers took make—up free (素颜) photos of the volunteers afterboth the good and the bad sleep.

    Next, theyasked 122 strangers to have a look at the photos and judge (评价) them on attractiveness, health,and sleepiness, as well as asking them: "How much would you like to makefriends with this person in the picture?"

    Thestrangers were good at judging whether the person they were looking at wastired, and if he was sleepy, his attractiveness score would be low.

    Thestrangers also said they wouldn't want tosocialize with the tiredstudents. The researchers say this is natural for people. An unhealthy-lookingface makes people run away. In other words, people don't want to hang aroundwith people who might be ill.

    Dr Brewer,an expert at the University of Liverpool said: "Judgment of attractivenessis often unconscious (无意识的), but we all do it, and we are able to judge on even somethingsmall like whether someone looks tired or unhealthy. This study is a goodreminder of how important sleep is to us."

Animals

   Corona viruses are common in animals. Sometimes, animals get infected (感染的) with these viruses which may then spread to human beings. To protect yourself, you should not visit live animal markets or have direct contact with wild animals. Stay away from raw meat, animal organs and other undercooked animal products.

   When an infectious pet was found in Hong Kong, some may wonder if one can get virus from their pets. Until today, there is no evidence that a dog, cat or any pet can transmit (传播) COVID-19. Please do not kill or give up pets!

Touching surface with virus

   Studies suggest that COVID-19 virus may stay on surfaces for a few hours or up to several days. However, the number may change under different conditions such as type of surface, temperature or the environment.

   If you think a surface may be infected, clean it with ethyl alcohol (酒精). After touching it, clean your hands with alcohol or wash them with soap and water. Avoid touching your eyes, mouth, or nose.

Package(包裹)

   Before delivering to your home, a package has been moved, travelled, and exposed to different conditions and temperature. Therefore, the possibility of being infectious because of your package from COVID-19-reported areas is rather low. There is no need to send your package back.

Smoking

   An article posted on Wechat recently says that cigarette can protect smokers from COVID-19 and thus make cigarettes sell very well. It is an online rumor (谣言)! As has been known, smoking harms people's health. It weakens the immune system and worsens diabetes and blood pressure. No smoking is still a must!

Transportation

   According to Feng Luzhao, an expert from the Chinese Center for Disease Control and Prevention, the major routes of transmission are still through respiratory droplets and direct contact. In order to protect yourself in underground station, wearing a mask and keeping your hands clean are good ways. People are also encouraged to use a personal transportation card or pay for the ticket via an app. After taking public transportation, washing hands is necessary.

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What did people do to communicate in ancient times? Here are some very interesting answers to this question.

Alphorns（阿尔卑斯长号角） were once used to communicate in the mountains in Switzerland. They are very long and they are very heavy, too. So, alphorns are hard work to blow. Then why use them? Well, they make a loud sound which travels much further than the human voice. Herdsmen（牧民） used them to call cows in the distance for milking. At sunset, alphorns were also used to send a message down to villagers that all was well. These days, they're mostly used as musical instruments.

The people of La Gomera, an island in Europe, have their own special way of sending messages from mountain to mountain. They use a whistled（口哨） language called el silbo, which comes from their language Spanish. Whistling can be heard within five kilorneters, which means it can be used across much greater distances than shouting. El silbo can be used for all kinds of messages, including greetings and announcements. El silbo is used a lot less than it used to be, but primary school students in La Gomera have to leave it.

Did you know it 's also possible to send messages without making a noise? This is called visual communication, and it includes the use of flags and even smoke. Long ago, soldiers along the Great Wall of China used smoke as a warning. If they noticed the enemy from their signal（信号） tower, they lit a smoky fire. When soldiers in other towers saw the smoke signal, they lit fires, too. In this way, messages about the enemy's arrival could travel as far as 800 km in just a few hours.

In recent years, we can see some changes on P. E. classes at schools. Besides basic trainings like running and jumping, students are having a lot of fun now. Here are some examples. 

Tai Chi

Gao Ming enjoys the Tai Chi class at his school. "At first, we only learned Tai Chi in P. E. class. Day by day, my classmates fell in love withit! There is a Tai Chi competition in our school every year. Different from ballgames, doing Tai Chi makes me calm down and relaxed. It helps me get ready for other classes." said Gao, "I also keep practicing in my free time and it has been a part of my life."

Hip-hop

Ren Hui is a fan of hip-hop and the school helps her develop the hobby. "We can choose the type (类型) of our P. E. class at the beginning of every term and I always go for hip-hop." Ren said "It doesn't need much experience, so anyone can have a try. Every Monday, we learn a new movement. Then we review it on Thursday and Friday. I'm very happy to make new friends during dancing!"

Diabolo (空竹)

Playing diabolo, a traditional folk game, is a class for nearly all the students at Nanjing Yuhua Primary School. The much-loved sport includes whole-body exercise. "It is my favorite sport. It can help me train my reaction (反应) speed. Most importantly, it's so cool and fun. " Ma Jiaying, an eighth-grade girl said.

 Dr. Jack Todd is very interested in clean water. {#blank#}1{#/blank#}, so it's natural that he is to develop a small and affordable system(系统) to clean wastewater. His" Living Machine" can clean wastewater in your home or in your business.

{#blank#}2{#/blank#} The wastewater goes into a big plastic tank where bacteria(细菌) start to break down the waste. {#blank#}3{#/blank#}, the water is brought into a greenhouse filled with plants and fish.

 With the help of sunlight, the plants and animals remove more chemicals from the water, making it cleaner. Then the water can be reused for washing or bathing {#blank#}4{#/blank#} but the water is clean enough for watering the flowers, washing the dogs, or even for bathing or swimming.

 The advantage of this technology is that it is affordable and good for the environment. {#blank#}5{#/blank#} It can help to use less fresh water, and it can help keep the water supply unpolluted.