A study published in Child Development,the top－ranked educational psychology journal,provides some of the strongest evidence yet that gesturing may have a unique effect on learning.Teachers in the United States tend to use gestures less than teachers in other countries.

     "Gesturing can be a very beneficial tool that is completely free and easily employed in classrooms," said Kimberly Fenn,study co－author and assistant professor of psychology at Michigan State University."And I think it can have long－lasting effects."

    Fenn and Ryan Duffy of MSU and Susan Cook of the University of Iowa conducted an experiment with 184 second－,third－ and fourth－graders in Michigan elementary classrooms.

    Half of the students were shown videos of an instructor teaching math problems using only speech.The others were shown videos of the instructor teaching the same problems using both speech and gestures.In the speech－only videos,the instructor simply explains the problem.In the other videos,the instructor uses two hand gestures while speaking,using different hands to refer to the two sides of the equation.Students who learned from the gesture videos performed better on a test given immediately afterward than those who learned from the speech－only video.

    Another test was given 24 hours later,and the gesture students actually showed improvement in their performance while the speech－only students did not.

    While previous research has shown the benefits of gestures in a one－on－one tutoring－style environment,the new study is the first to test the role of gestures in equivalence learning in a regular classroom.

    The study also is the first to show that gestures can help students transfer learning to new contexts—such as transferring the knowledge learned in an addition－based equation to a multiplication－based equation.

    Fenn noted that U.S.students lag behind those in many other Western countries in math and have a particularly hard time mastering equivalence problems in early grades."So if we can help them grasp this foundational knowledge earlier," she said,"it will help them as they learn algebra and higher levels of mathematics."

    Information Overload

    In modern society，if we're trying to make a decision，we often have so much information that we get confused，and we don't know what to do．This state is known as information overload．{#blank#}1{#/blank#} It can cause stress，frustration and reduced productivity．But what can we do in the face of information overload？

•Plan for only one time each day to check e-mail，social messaging sites，Wechat，etc．Don't allow yourself to check multiple times，unless you truly are waiting for an important e-mail．{#blank#}2{#/blank#}And that eats up your valuable time before getting away．

    If you are suffering from too many electronic interruptions during the weekday，ask people to call or text you during work hours only if it's really an emergency．{#blank#}3{#/blank#}

    Remind yourself that it's okay to not know everything．In fact，it's impossible to keep up with the pace of the information superhighway．The sooner you accept that，the happier you'll be．{#blank#}4{#/blank#} It is good to fall behind on the information that really isn't worth your attention．

    {#blank#}5{#/blank#}Set aside a regular time each week where you and other family members do not use any kind of electronic media technologies，including television．It could be something you do every weekend，or perhaps an hour or two every evening．

A．Just catch up with the happiest moment．

B．Know what's worth knowing and what isn't．

C．Each time you go online，you run the risk of being addicted to it．

D．Spend time with your family free from electronic products．

E．We need to find some effective ways to process the information．

F． Almost everyone suffers from it to some degree．

G．Otherwise they and you end up stealing time from your employer．

Live in Cave

    Kokopelli's Cave Bed &Breakfast, Farmington, New Mexico.

    The idea may seem very stone age, but this lone unit, which was carved into a 65-million-year-old sandstone rock, is filled with modern amenities(便利设施). The Travel Channel says these “cave comforts” include a comfortable bedroom, large fire circle, and rainfall shower. Plus, the views of the La Plata River and nearby mountains are breathtaking.

    $260/ night; bbonline.com

    Sleep below the Surface

    Jules' Undersea Lodge, Key Largo, Florida.

    This hotel, which is named after20,000 Leagues Under the Sea author Jules Verne, is the world's only underwater hotel. Lonely Planet says that this former research station has been turned into a pleasant hotel. Guests must make the 21-foot dive to its two rooms, fully stocked kitchen, and showers. Don't want to cook? The staff will dive and bring your food to you.

    $400/night; jul.com

    Sail into History

    The Queen Mary, Long Beach, California

    Wish you could experience the greatness of a ship like the Titanic? According to CNN Travel, here's your chance. Book a room to get a taste of a bygone time on this ship-turned hotel. You may not be able to sail into the sunset like Kate and Leo, but you can enjoy onboard attractions like original 1930s artwork and tours of strange and mysterious hot spots.

    $129/night;queenmary.com

    While faking and fierce looks are among animals great defenses, many species know that everyone runs from a big stink (臭气) too.

    Vulture (秃鸳)

    Vultures, are street sweepers that feast on the rotting flesh of dead animals, which benefits us by ridding our highways and landscapes of animal bodies and the bacteria they might carry. When vultures feel threatened they vomit, and the smell of vomited-on dead bodies puts of most predators. Throwing up allows the vulture to fly away more quickly-and the vomit can hurt the aggressor's eyes and face.

    Opossum (负鼠)

    In some ways opossums have it easy. In order to become "dead", they don't have to fax anyone a death certificate. They just lie there with their tongues hanging out with the smell of dead flesh, sometimes for hours, effectively convincing potential predators they can find a much fresher meal elsewhere. Even if they keep getting attacked, they won't move any more than a human statue until the threat has passed.

    Hoatzin (磨雉)

    Hold your nose and meet the hoatzin, a bird of distinctions, not the least of which is that it smells like fresh cow shit. The animal mostly eats leaves and it's the only bird known to digest by fermentation, like a cow. This process is what causes its smell and has earned it the nickname the "stink bird

    Millipedes (千足虫)

    Millipedes are tricky. For starters they look wormy. Their name is deceptive, too: Their legs number about 750. Their major defense is to curl up into a ball. They, though, also release a harm eyes, and leave a horrible smell on their attackers.

    Sea Hare (海兔)

    The graceful sea hare is plain in taste in the first place, so it's not the most popular dish in the seafood chain. Nonetheless this type of sea creature has a pretty creative smell-related defense that is almost the opposite of its smelly companions on this list. The sea hare gives out a slimy, purple ink, the substance which makes food less palatable to predators.

    Researchers using lobsters (2-f) as model predators found that the sea blocks the lobsters receptive mechanism. In other words, the sea hare gives its attacker the equivalent of a stuffy nose so they don't know how appealing it is.

You've probably heard it a dozen times by now. But here it goes again: Sleep is important. Your mental health and immune (免疫时)system are connected to your sleeping habits. So are your grades, a new study finds. Sleep accounts for nearly one-fourth of the difference among students' grades in a class. So even if you spend hours studying for a test but get too little sleep, you might still do poorly.

Typically, people's sleep schedules are messy and can not be known in advance. Professor Jeffrey Grossman of Massachusetts Institute of Technology in Cambridge wanted to see if sleep links to people's learning performance even when a study was done with people who kept such true-to-life schedules at home. So he turned to Fitbits, which can check how long people sleep and how frequently they wake up. And the researchers looked for 100 students. They focused on these students' sleep patterns in the days and weeks before exams and then compared them to these students' test scores.

"How much time a person sleeps the night. before an exam doesn't affect that person's grade," Grossman says. "A student who sleeps 7 hours every night will do better than a student who sleeps 7.5 hours one night and 6.5 hours another night."

"It's important for people to know that if their Fitbits tell them that they have terrible sleep, that may not actually be so," Michael Scullin, a sleep scientist at Baylor University says. Grossman also raises this point. Fitbit, Inc. makes this advanced tool. But it doesn't share how its tool works. This leaves a question about whether the tool is really correct when checking a student's sleep. Even so, Scullin emphasizes that there are enough data supporting ties between sleep and how well someone performs.

"Students need more sleep and less late evening use of phones and other screens. Even with after-school activities and schoolwork, they need to get enough sleep," Grossman says.

Hamlet, the prince of Denmark, has come back from university to find that his father, the old king, is dead. His mother has married his father's brother, Claudius, who is now king of Denmark. Hamlet is shocked that his mother has married so soon after his father's death, and angry that she has married Claudius.

Soon, a ghost (幽灵) is seen walking on the castle walls. The ghost looks like Hamlet's father, the dead king. When Hamlet sees the ghost, he is told that it is the ghost of his father. "I am your father's spirit," the ghost tells Hamlet. It tells him that Hamlet's father did not die naturally, but was murdered by his brother Claudius. As the king slept, Claudius put poison into his ear, causing the king a painful death. The ghost tells Hamlet to take revenge on Claudius for murdering his father.

Hamlet can't believe his mother would marry the man who murdered her husband. He becomes depressed, and he thinks about killing himself: "To be or not to be, that is the question. " Hamlet decides to pretend he is mad while he tries to find out if King Claudius really killed his father. Claudius soon notices that Hamlet is acting strangely, so he asks Polonius, his adviser, to discover if it is true…