【推荐3】Some dogs can be really mean. They fight with other dogs and bark at you on the street when you walk by.

Now scientists say that some dogs are badly behaved because they were taken away from their mothers too early. Scientists say this can turn them into aggressive(有攻击性的)dogs.

Researchers at the University of Milan in Italy studied 140 dogs aged between 18 months and seven years, according to the Daily Mail newspaper.

Half of these dogs had been taken away from their mothers and given new homes when they were between 30 and 40 days old. The other half were taken away when they were 60 days old.

Researchers asked the owners where their pets were from and what breed they were. Then they asked owners to write down whenever their dogs behaved badly. Examples of bad behavior include biting furniture and clothes, barking a lot, and being aggressive to people. Some dogs got angry if other dogs took away their food and toys. Some got scared when they were walking outdoors or if they heard a sudden noise.

The scientists found that bad behavior was more common in dogs that had been taken away from their mothers between 30 and 40 days old.

Behavior was also worse in dogs that had been removed early and put in pet shops than those that had been removed later.

So if you want to keep a pet dog. think twice before getting one younger than two months old. Your puppy could grow up to be a real troublemaker.

Rhythm of LifeChoosing the right time to sleep, the correct moment to make decisions, the best hour to eat—and even go into hospital—could be your key to perfect health.Centuries after man discovered the rhythms(节奏、韵律) of the planets and the cycles of crops, scientists have learned that we too live by precise rhythms that govern everything from our basic bodily functions to mental skills. Man is a prisoner of time.But it’s not just the experts who are switching on to the way our bodies work.    1    Prince Charles consults a chart which tells him when he will be at his peak on a physical, emotional and intellectual level. Boxer Frank Bruno is another who charts his bio-rhythms to plan for big fights.    2    Sleep, blood pressure, hormone levels and heartbeat all follow their own clocks, which may bear only slight relation to our man-made 24-hour cycle.Research shows that in laboratory experiments when social signals and, most importantly, light indicators such as dawn are taken away, people lose touch with the 24-hour clock and sleeping patterns change. Temperature and heartbeat cycles lengthen and settle into “days” lasting about 25 hours.In the real world, light and dark keep adjusting internal clock to the 24-hour day. But the best indicator of performance is body temperature. As it falls from a 10 p.m. high of 37.2℃ to a pre-dawn low of 36.1℃, mental functions fall too.    3    The most famous example is the nuclear accident at Three Mile Island in the US. The three operators in the control room worked alternating(交替的) weeks of day, evening and night shifts.    4    Investigators believe this caused the workers to overlook a warning light and fail to close an open valve.Finding the secret of what makes us tick has long fascinated scientists and work done over the last decade has yielded important clues.    5    For example, the time we eat may be important if we want to maximize intellectual or sporting performance. There is already evidence suggesting that the time when medicine is given to patients affects how well it works.

【推荐2】Everyone has got two personalities---the one that is shown to the world and the other that is secret and real. You don’t show your secret personality when you’re awake because you can control yourself, but when you’re asleep, your sleeping position shows the real you. In a normal night, of course, you often change your sleeping positions. The important position that best shows your secret personality is the one that you fall asleep with.

If you go to sleep on your back, you’re a very open person. You normally trust people and you are easily influenced by fashion or new ideas. You don’t like to upset people. So you never express your real feelings. You’re quite shy and you aren’t very confident.

If you sleep on your stomach, you are a person who likes to keep secrets. You worry a lot and you’re always easily becoming sad. You never want to change your ideas, but you are satisfied with your life the way it is. You usually live for today not tomorrow.

If you sleep curled up(卷曲), you are probably a very nervous person. You have a low opinion of yourself and you often protecting yourself from being hurt, so you are very defensive. You’re shy and you don’t usually like meeting people. You prefer to be on your own. You’re easily hurt.

If you sleep on your side, you have usually got a well-balanced(平衡的) personality. You know your strengths and weaknesses. You’re usually careful. You believe in yourself. You sometimes feel anxious, but you don’t often get unhappy. You always say what you think, even if it makes people rather angry.

【推荐3】Making the Most of the Body's Clock

Want to know when the best time is to do your homework and study for your exams? Then just take advantage of your body's clock, and you can work more efficiently(效率高地)and more happily.     1    

Morning

Research shows that in the morning your body can take fatty foods more easily, so don't worry too much about having a big breakfast.     2     So if you need to go to the doctor's for an injection(注射), this is the best time to go.

Do you know that the best time for the brain to work well is between 10: 00 am and noon? Therefore, that's the time when you should be listening to your teachers the most attentively.

Lunch-time

Between 12: 00 pm and 2: 00 pm is the best time for eating. The body clock tells your body to help you digest your food at this time, so you have less chance of suffering from stomachache.

Early Afternoon

    3     There is a slowdown in the speed your brain works, so it's not the best time to solve difficult maths problems.

Late Afternoon

After three o'clock, the body clock starts to tell your body to start working again.     4    So why not try to start and finish your homework during this time period?

Late Evening

Between 8: 00 pm and 10: 00 pm is the time people are most likely to feel lonely.     5    Another problem students have at night time is the difficulty in sleeping. If you want a good night's sleep, just take a warm bath and don' t do any exercise before you sleep. Avoid staying up late.

【推荐1】Food storing is common in members of the crow(乌鸦）family.A new study tested the birds outside this naturally occurring behaviour,which may have evolved(进化）specifically because it gives crows a survival advantage.Some crow species are known to naturally use tools to recover food.So the researchers tested whether the birds could store and recover a tool so they could get it at their food after a gap of 17 hours-something we wouldn't expect them to do naturally.But they were able to instantly select the tool out of a number of unnecessary items.

In another experiment,the researchers taught crows to select a token(礼品券）from a number of items so that they could then exchange for food.Again,the birds then showed that they could plan for the future using this new behaviour.This is different from all of the previous studies in future planning,which have focused on naturally occurring behaviour.For example,we know that chimpanzees select,transport and save appropriate tools for future needs.

These studies have shown that animals can plan for the future-but they left an important question open for debate.Are animals only able to plan to use abilities that have evolved to give them a specific advantage,or can they flexibly and intelligently apply planning behaviour across various actions? Most critics would say the former,as the animals were tested in naturally occurring behaviors.

But the new research provides the first evidence that animal species can plan for the future using behaviour that doesn't typically occur in nature.This supports the view that at least some recognitive abilities in animals don't evolve just in response to specific problems.Instead,it suggests that animals can apply these behaviors flexibly across problems in a similar way to humans.We need to investigate how flexible behaviour evolved.Then we might be able to see how crows' ability to plan for the future fits in with their broader cognitive powers.

【推荐2】Chinese researchers have developed a robot designed to help doctors treat the new coronavirus and other highly contagious (传染的)diseases.

The machine has a long robotic arm attached to a base with wheels. It can perform some of the same medical examination tasks as doctors. For example, the device can listen to sounds made by patients'hearts and lungs.

Cameras record the robot's activities, which are controlled at a distance so doctors can avoid coming in close contact with infected patients. Doctors and other medical workers can run the machine from a nearby room, or from much farther away.

The robot's main designer is Zheng Gangtie, an engineer and professor at China's Tsinghua University in Beijing. He told Reuters news agency that he got the idea for the machine when the number of cases of the COVID-19 virus was rising quickly in the city of Wuhan.

One of Zheng's friends, head of Bering's Tsinghua Changgung Hospital, told him that one of the biggest problems in dealing with COVID-19 was that healthcare workers treating patients were getting themselves infected. Zheng said he wanted to do something to help this situation.

So the engineer gathered a team and went to work on the robot. Zheng said the team was able to change two robotic arms. The new robot is almost completely automated (自动化的), Zheng said. It can even disinfect itself after performing actions involving patient contact.

"Doctors are all very brave," Zheng told Reuters. "But this virus is just too contagious…We can use robots to perform the most dangerous tasks."

However, Zheng said he had heard from some doctors that it would be better not to build such robots. This is because many patients still desire a personal presence to help calm them during treatment.

The team now has two robots and both have been tested by doctors at hospitals in Beijing. One machine was once taken to Wuhan's Union Hospital, where doctors there were trained to use it.

Zheng would like to build more of the robots, but money from the university has run out, each robot costs about$72,000 to make. He does not plan to commercialize the design, but hopes that a company can begin that process.

【推荐3】Recently a new network word “ghost” is popular on line, which refers to a sort of Internet social behavior that your net friends or loved ones don’t answer your online messages or phones on purpose as if leaving the earth. Thus you often wonder whether those chatters are ghosts or pretending to be dead. This behavior is called ghosting in the English world, which means “playing with disappearance”.

“Ghost” is better known as a noun referring to spirits of the dead, but “ghost” used as a verb which means “to disappear suddenly like a ghost”, or “play with disappearance” is relatively unknown. Finally, owing to its high using frequency online, this usage has been added to the Oxford Dictionary of Contemporary English.

Playing with disappearance or ghosting also has different grades. Wendy Walsh, a professor of psychology from Boston University told us, “There are different grades of ghosting: If you just read on social software but never answer, you are only a lightweight ghosting player; if you meet a person several times but try to avoid him, you are an ordinary ghosting player; if you let your partner fall in love with you, but you suddenly disappear; which will give the other a heavy blow, you are a heavyweight ghosting player.”

Why are some people accustomed to this kind of escapist social behavior? The Times reports that ghosting has a lot to do with how comfortable people feel and how they deal with their emotions. When they are in a complex interpersonal relationship, or it is too heavy for their weak mind to carry, they will have to choose to escape.

When you find yourself being ghosted, you may lose your self-respect, question yourself, or even hesitate to start the next friendship or love. How to get out of this emotional trouble? It’s important to remember that when you’re ghosted, it’s the other’s fault rather than yours. In addition, it’s good to risk telling others how you really feel, even if it’s not what they want to hear. Have you ever been ghosted? What do you think of this way of dealing with a relationship?