The “swim-with-dolphins” tourist industry is becoming more popular every year with the increase of people's income. After all, it can cost a large amount of money to have this kind of holiday experience. So tour operators try to place eager swimmers as near as possible to the dolphins by trying to predict where the dolphins will be.

    Research has shown that while dolphins can move away if they do not want to interact (交流） with human swimmers, they do not like it at all if the swimmers slip into the water directly on top of them or if humans are in their path of travel. However, if swimmers enter the water to one side of them, the dolphins do not avoid the swimmers to the same extent.

    In all cases, the dolphins seem to have become more sensitive to the presence of the swimmers. For dolphins, swimming amongst or with humans is not necessarily a high priority. This research has shown that only 19% of any group of dolphins will participate in interaction. Young dolphins are the most likely to interact; they do seem curious about being with humans. It is believed that they see humans as “entertainment” and that the interaction is a new and unusual experience for them.

    It is frequently asked whether “swim-with-dolphins” tourism should be discontinued. The advice is that dolphins should be given enough periods of time throughout the day when they are not exposed to tourism. Permitted interactions should not be too disturbing to the dolphins since there could be mothers and calves (幼崽） present in dolphin groups. There should also be educational campaigns about the creatures and what is likely to cause danger to them.

    It is not easy to explain to someone that they cannot fulfill their lifelong dreams because the dolphins are resting, or that a mother dolphin and calf are in the area. But if we are to enjoy these remarkable animals and not just use them for our entertainment, then we must carefully monitor the “swim-with-dolphins” industry worldwide.

    We asked more than 200 teachers,children's authors,and children's literature experts to name the best picture books ever.We made a list based on their advice.Here are some of the books in the list.

    If You Give a Mouse a Cookie by Laura Numeroff,illustrated by Felicia Bond

    Who it's for: Grades PreK-2

    What it's about: Oh,that hungry mouse.Once you give him the cookie,he will ask for a glass of milk,and then a straw（吸管）and then...The action is unstoppable!In the end,the mouse and the boy that gives him the cookie (and perhaps the reader) are extremely exhausted!With terrific pictures and a wonderful lead character,this book shouldn't be missed by little kids.

The Other Side by Jacqueline Woodson,illustrated by E.B.Lewis

    Who it's for: Grades 1-4

    What it's about: This is a story about a fence（篱笆）that divides a white neighborhood from a black one and two little girls whose need for play and friendship allow them to cross it.It has a very deep theme.

Owl Moon by Jane Yolen,illustrated by John Schoenherr

    Who it's for: Grades 1-5

    What it's about: A classic example of child's expanding a simple walk into a glorious adventure.As a girl and her father hike through the moonlit night,the creatures they come across become exciting companions（同伴）for their owl hunt.

    The Snowman by Raymond Briggs

    The only wordless story on our list.

    Who it's for: Grades PreK-2

    What it's about:A great book to lead a child into reading.A fanciful story of a boy who makes and then befriends a snowman who both enters his world and takes him out for fun.

    An experiment was carried out at British school into the performance of new pupils. At the start of the year, the pupils were each given a rating, ranging from "excellent prospect" to "unlikely to do well". These were totally untrue ratings and did not reflect how well the pupils had previously performed. However, these ratings were given to the teachers. At the end of the year, the experimenters compared the pupils' performance with the ratings. Despite their real abilities, there was an astonishingly high connection between performance and ratings. It seems that people perform as well as we expect them to.

    The Self-fulfilling Effect is also known as the Pygmalion Effect. This comes from an old Greek story. The story was also the basis of George Bernard Shaw's play "Pygmalion", later turned into the musical "My Fair Lady". In Shaw's play, Professor Henry Higgins claims he can turn a Cockney flower girl, Eliza Doolittle into a duchess. But, as Eliza herself points out to Higgins' friend Pickering, it isn't what she learns or does that determines whether she will become a duchess, but how she's treated.

    The implication (含义) of the Pygmalion Effect for leaders and managers is massive. It means that the performance of your team depends less on them than it does on you. The performance you get from people is no more or less than what you expect, which means you must always expect the best. As Goethe said, "Treat a man as he is and he will remain as he is. Treat a man as he can and should be and he will become as he can and should be."

    If your dog looks pleased to see you—it is probably because it loves the particular way you smell.

    The scent (气味)of a familiar human apparently lingers like perfumein the animal's brain—where it causes an instinctive emotional response, research reveals.

    Our scent acts on a part of the canine (犬科的) brain associated with reward and the strongest reactions are produced by humans that pets know best, say scientists in America.

    Gregory Bern, of Emory University in Atlanta, said, “While we might expect that dogs should be highly tuned to the smell of other dogs, it seems that the 'reward response' is reserved for their humans. When humans smell the perfume of someone they love, they may have an immediate, emotional reaction that's not necessarily cognitive (认识的). So is it in dogs. But since dogs have a more sensitive smell than humans, their responses would likely be even more powerful than the ones we might have. In our experiment, however, the owners of the dog were not physically present. The canine brain responses were being caused by something distant in space and time. It shows that dogs' brains have these mental representations of us that persist when we're not there.”

    The experiment involved 12 dogs of various kinds by brain scans while five different scents were placed in front of them. The scent samples (样本)came from the subject (接受试险者) itself, a dog the subject had never met, a dog living in the subject's household. The familiar human scent samples were taken from someone else from the house other than the handlers during the experiment, so that none of the scent donors were physically present.

    The results showed all five scents gained a similar response in parts of the dogs brains involved in detecting smells. Responses were significantly stronger for the scent of familiar humans, followed by that of familiar dogs. The findings showed dogs reacted strongest to the scent of familiar humans even when they were not there. Pets trained as help or therapy dogs showed greater brain activity than the other dogs in the test.

    Researchers say the findings could improve the way to select animals helping wounded old soldiers or disabled people.

    Scientists recently discovered that pictures on cave walls at Creswell Crags are the oldest known in Great Britain. But they didn't find out in the usual way.

    Archaeologists often date cave art with a process called radiocarbon dating. The technique can measure the age of carbon found in charcoal (木炭) drawings or painted pictures. Carbon is an element found in many things, including charcoal and even people. But in this case, there was no paint or charcoal to test. People carved the pictures of animals and figures into the rock using stone tools. The scientists had an "aha!" moment when they noticed small rocks stuck to the top of the drawings. The small rocks must have formed after the drawings were made.

    "It is rare to be able to scientifically date rock art," said Alistair Pike, an archaeological scientist at Britain's University of Bristol. "We were very fortunate that some of the engravings were covered by stalagmites(石笋).

    When a test proved that the stalagmites formed 12,800 years ago, the scientists knew the art underneath them had to be at least that old. And some of the animals shown, like the European bison, are now extinct-another tip-off that the art is quite old.

    The artists came to Creswell Crags, This place is one of the farthest points north reached by our ancient ancestors during the Ice Age. At that time, much of the North Sea was dry, so people could move about more easily.

    Some tools and bones found there are 13,000 to 15,000 years old. They show that the travelers hunted horses, reindeer, and arctic hare. Their artwork is similar to art in France and Germany. It tells scientists that the Creswell Crags artists must have had a close connection to peoples several thousand kilometers away—another important clue to understanding how humans spread out across the world.

Paper cutting is one of the most popular decorative Chinese handicrafts. It is popular for its low cost and artistry. Rural women often make paper cuttings in their spare time when farming is not busy. As a {#blank#}1{#/blank#} (reflect) of its philosophical origins, paper cutting is comprehensive and attractive. Moreover, folk paper cutting conveys (表达) the content and nature of traditional culture with {#blank#}2{#/blank#} (it) own particular language.

The history of paper cutting {#blank#}3{#/blank#}_(date) back to around the 6th century. From the 7th to 13th century, paper cutting became popular {#blank#}4{#/blank#} (especial) during Chinese festivals. The art spread to the rest of the world in the 14th century.

These days, with a pair of scissors {#blank#}5{#/blank#} a piece of red paper, Fu Zhao'e from the Ningxia Hui autonomous region cut out an image of Argentina football star Lionel Messi within a couple of minutes.

Since the Qatar World Cup {#blank#}6{#/blank#}_(start), Fu, 63, has been creating works of football superstars, {#blank#}7{#/blank#} are favored by a lot of her friends. "I can cut out anything that I can picture in my mind, people, animals and scenery{#blank#}8{#/blank#} (include)," said Fu, {#blank#}9{#/blank#} (add) that people say the cuttings were lifelike.

Fu is a national-level inheritor (继承人) of paper-cutting. Her works show the customs of northwestern China and have strong ethnic characteristics. She was recognized as {#blank#}10{#/blank#} Chinese folk craft artist by UNESCO.