Dogs are likely to have complex emotions such as jealousy(嫉妒)and pride, according to a new scientific research.

    Dogs feel very jealous when they find that they are unfairly treated. And they do not like seeing their owners being kind to other creatures, especially other dogs. They often react negatively(消极地)when their owners bring home new pets, the research found. “Dogs show a strong aversion to unfair treatment,” Dr. Friederike Range of the Vienna University said.

    At first, people believed most animals lack(缺少)the “sense of self” , which is needed to experience so-called secondary emotions such as jealousy, embarrassment or guilt. These emotions are more complex than feelings such as anger or joy.

    Besides dogs research, another research includes cows, horse, cats and sheep, and all the results have shown that animals are far more self-aware than we thought.

    Dr Paul Morris, a psychologist at the University of Portsmouth who studies animal emotions, told The Sunday Times, “We are learning that dogs, horses, and perhaps many other species are far more emotionally complex than we ever realized. They can suffer simple forms of many emotions we once thought only primates (灵长类) could experience. ”

    In research among dog owners, Dr Morris found almost all of them reported jealous behavior by their pets. The dog often tried to keep their owner away from a new lover in the early days of a relationship.

    Behavioral experts suggest that owners should keep a close relationship with the dog as usual when a new pet or child comes along in order to prevent jealous activity from the dog such as interruptions with barking.

    The past two decades have seen astronomers' catalogue of planets expand over two hundred times, as new techniques and better telescopes have found more than 2,000 of them orbiting stars other than the sun. But in the solar system itself, the list of planets has actually shrunk, Pluto（冥王星）having been downgraded from that status in 2006. The number of the sun's planetary companions has thus fallen from nine to eight.

    Now, a pair of astronomers from the California Institute of Technology think they have evidence that will restore the sun's record to its previous value. Their analysis of objects orbiting in the Kuiper Belt（柯伊伯带）, a ring of frozen asteroids（小行星）that circle beyond the orbit of Neptune (and of which Pluto is now regarded as the largest member), suggests to them that something about ten times as massive as Earth has changed those orbits. If you knew where to look, this planet-sized object would be visible through a suitable telescope. And Konstanin Batygin and Michael Brown believe they do know.

As they write in the Astronomical journal, they have analyzed the orbits of Kuiper Belt objects and found six that behave in a peculiar way. As the diagram shows, the points of closest approach of these objects to the sun, known as their perihelia（近日点）, almost coincide. Moreover, these perihelia all lie near the ecliptic（黄道）—the plane of Earth's orbit and also, approximately, that of the other planets—while the objects' orbits are all angled at 30° below the ecliptic. The chance of all this being a coincidence, the two researchers estimate, is about seven in 100,000. If it is not a coincidence, it suggests the six objects have been guided into their orbits by the gravitational intervention of something much larger.

    A computer analysis Dr Batygin and Dr Brown performed suggests this something is a planet weighing 5-15 times as much as Earth, whose perihelion is on the opposite side of the sun from the cluster, and which thus orbits mainly on the other side of the solar system from the objects its orbit has affected. This planet's perihelion would be 200 times farther from the sun than Earth's, and the far end of its orbit might be as much as six times that distance away. This gives a search zone, and Dr Batygin and Dr Brown are using Subaru, a Japanese telescope, to perform that search.

    Given other demands on Subaru's time, it might take five years for this search to find (or not find) the hypothetical planet. But looking at some existing data from. The Widefield Infrared Survey Explore, a satellite, might also show it, if it is there to be seen.

    Ironically, it was Dr Brown as much as anyone who was responsible for Pluto's downgrading, for he discovered Eris, an object almost as big as Pluto, in 2005.

    That discovery did much to damage Pluto's planetary proof. By his own admission, he was skeptical that the anomalies he and Dr Batygin have investigated actually would point to the existence of a replacement ninth planet. He is a skeptic no longer. Whether he is actually right may soon become apparent.

    Latrice Brown was excited about starting her junior year. She had volunteered to take part in the Lincoln High School Friendship Program. As an upperclassman, she would be assigned a “freshman(新生) friend”. Her duties would include helping her friend get used to high school life by offering friendship. Latrice thought it was important to have someone with whom to talk and share concerns. She knew that the friendship program was likely to make the freshman year of high school a positive experience. On August 2nd Latrice received a notice in the mail about the schedule of events for the freshman orientation (适应指导).

Freshman Orientation

    Please call your freshman friend and introduce yourself over the telephone.

    Confirm that he or she will be attending the orientation.

    Barbara McCintock was one of the most import scientists of the twentieth century. She made important discoveries about genes（基因） and chromosomes （染色体）.

    Barbara McClintock was born in 1902 in Hartford, Connecticut. Her family moved to Brooklyn area of new York City in 1908. Barbara was an active child with interests in sports and music. She also developed an interest in science.

    She studied science at Cornell University in Ithaca, New York. Barbara was among a small number of undergraduate students to receive training in genetics in 1921. Years later, she noted that few college students wanted to study genetics.

    Barbara McClintock decided to study botany, the scientific study of plants, at Cornell University. She completed her undergraduate studies in 1923. McClintock decided to continue her education at Cornell. She completed a master's degree in 1925. Two years later, she finished all her requirements for a doctorate degree.

    McCintock stayed at Cornell after she completed her education. She taught students botany. The 1930s were not a good time to be a young scientist in the United States. The country was in the middle of the great economic Depression. Millions of Americans were unemployed. Male scientists were offered jobs. But female geneticists were not much in demand.

    An old friend from Cornell, Marcus Rhoades, invited McClintock to spend the summer of 1941working at the Cold Spring Harbor Laboratory. It is a research center on Long Island, near New York City. McClintock started in a temporary（临时的）job with the genetics department. A short time later, she accepted a permanent （永久的） position with the laboratory. This gave her the freedom to continue her research without having to teach or repeatedly ask for financial aid.

    By the 1970s, her discoveries had an effect on everything from genetic engineering to cancer research. McClintock won the Nobel Prize for Physiology or Medicine in 1983for her discovery of the ability of genes to change positions on chromosomes. She was the first American woman to win an unshared Nobel Prize.

When faced with the decision to get out of bed or have a few more minutes of sleep, which do you choose? Believe it or not, that decision could make a world of difference in the rest of your day.

About 85 percent of Americans use an alarm clock to wake up in the mornings, according to sleep researcher Till Roennenber. And while there are no official numbers on snoozing (打盹), a quick survey of social media makes it clear that hitting the snooze button is a popular pastime.

As to how the snooze button will affect your day, scientists have mixed opinions. Some scientists think people who hit the snooze button in the mornings are actually clever, creative and happy while some said that hitting the snooze button will ruin your life, or at the very least your day. "I feel that hitting the snooze button has got to be one of the worst things that ever happened to human sleep," researcher Jonathan Horowitz said. "The chances of you 'snoozing' and actually experiencing a meaningful rest are close to zero."

According to some sleep experts, when hitting the snooze button, you are in fact confusing your body and mind, and throwing yourself into a deep state of being sleepy. The body needs some time to wake up, so, when returning to what will be a light sleep for a brief period of time, you are putting your body back into a sleep mode before waking it again. At that point your body won't know what it wants, resulting in a sort of half awaken state.

If you really want to take advantage of an alarm clock, the key is to form a healthy sleep cycle. Focus your efforts on getting enough sleep each night and waking up at the same time each day so that when your alarm goes off you feel rested.

Tunnels are passageways that are built under the ground. They can also be made under a sea or a river. Some tunnels are dug through high mountains.

For hundreds of years, tunnels have been built all over the world. People use these tunnels to travel from one place to another. Some tunnels are used as waterlanes. Coal and gemstones are also brought from under the ground through long tunnels.

In the past, people dug tunnels using picks and shovels. Rocks and soil were loaded into one-wheel barrows and then onto horses and carts. This work was very tiring.

Today, engineers do a lot of planning before they start to build a tunnel. They use computers to check the level of the water and the types of rock under the ground. When they are sure the area is safe, huge machines are used to dig out the soil.

These machines have an enormous cutting wheel at the front. The wheel slowly grinds (磨碎) through the rock and soil to make the tunnel. Soil that is not needed is carried away in large trucks. As the tunnel becomes longer, it is lined with huge pipes so the walls and roof do not callapse.

Long tunnels have powerful lights to help drivers see the road ahead. Water sprinklers (洒水装置) are fitted to help keep people safe if a fire breaks out in the tunnel.

In large cities, tunnels are built under very busy roads. , People can drive through these tunnels. This makes it quicker to travel to different parts of the city.

Some trains have to wind slowly and carefully over steep mountain slopes. But, in places where there are tunnels, trains can travel quickly through the mountain to reach the other side.