Recordings of angry bees are enough to send big, tough African elephants running away, a new study says. Beehives (蜂窝)—either recorded or real—may even prevent elephants from damaging farmer's crops.

    In 2002, scientist Lucy King and her team found that elephants avoid certain trees with bees living in them. Today, Lucy wants to see if African honeybees might discourage elephants from eating crops. But before she asked farmer to go to the trouble of setting up beehives on their farms, she needed to find out if the bees would scare elephants away.

    Lucy found a wild beehive inside a tree in northern Kenya and set up a recorder. Then she threw a stone into the beehive, which burst into life. Lucy and her assistant hid in their car until the angry bees had calmed down. Next，Lucy searched out elephant families in Samburu National Reserve in northern Kenya and put a speaker in a tree close to each family.

    From a distance, Lucy switched on the pre-recorded sound of angry bees while at the same time recording the elephants with a video camera. Half the elephant groups left the area within ten seconds. Out of a total of 17 groups, only one group ignored the sound of the angry bees. Lucy reported that all the young elephants immediately ran to their mothers to hide under them. When Lucy played the sound of a waterfall (瀑布) instead of the angry bees to many of the same elephant families, the animals were undisturbed. Even after four minutes, most of the groups stayed in one place.

Lucy is now studying whether the elephants will continue to avoid the sound of angry bees after hearing it several times. She hasn't tested enough groups yet to know, but her initial (最初的) results were promising enough to begin trials with farmers. She has now begun placing speakers in the fields to see if elephants are frightened away.

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    Fat and shy, Ben Saunders was the last kid in his class picked for any sports team. “Foothall, tennis, cricket-anything with a round ball, I was useless,” he says now with a laugh. But back then he was the one always made fun of in school gym classes in Devonshire, England.

    It was a mountain bike he received for his 15th birthday that changed him. At first he went biking alone in a nearby forest. Then he began to-ride the bike along with a runner friend. Gradually, Saunders set up his mind on building up his body, increasing his speed and strength. At the age of 18, he ran his first marathon.

    The following year he met John Ridgway and was hired as an instructor at Ridgway's school of adventure in Scotland, where he learnt about Ridgway's cold-water exploits. Greatly interested, Saunders read all he could about North Pole explorers and adventures, then decided that this would be his future.

    In 2001, after becoming a skillful skier, Saunders started his first long-distance expedition towards the North Pole. It took unbelievable energy. He suffered frostbite, ran into a polar bear and pushed his body to the limit, pulling his supply-loaded sled（雪橇）up and over rocky ice.

    Saunders has since become the youngest person to ski alone to the North Pole, and he's skied more of the North Pole by himself than any other British man. His old playmates would not believe the change.

    Next October, Saunder, 27, heads south from the coast of Antarctica to the South Pole and back, a 2900-kilometer journey that has never been completed on skis.

    Annie Oakley was born in 1860 in Darke County, Ohio. Her family was very poor. She decided to help family even when she was young, so she learned to use a gun, and began hunting animals for food. She could shoot them without losing the important parts of the meat.

    Soon her shooting ability became well known. When she was sixteen, she was invited to a competition with a famous marksman(神枪手) , Frank Butler. Annie surprised everyone by winning the competition. Later that year she and Frank married.

    In 1882 Annie Oakley and Frank Butler started putting on shows together. Frank Butler was the star of the show and she was his assistant. The famous native American leader, Sitting Bull, thought so highly of her shooting ability that he called her "Little Sure Shot". Later Annie Oakley became the star of the show and Frank Butler was her assistant. Posters （海报）for the show called her the "Champion Markswoman".

    During World War I, Annie Oakley wanted to train a group of women volunteers for the army, but the United States did not accept it. She gave American soldiers shooting lessons, and traveled across the country visiting many training camps. She gave shooting performance and raised money to support the American soldiers.

   Annie Oakley died on November 3, 1926. Eighteen days later, Frank Butler died too.

    I had been living in a whirl: studying the organ at the University of Arizona, conducting a speech clinic in town, and teaching a class in musical appreciation at the Desert Willow Ranch, where I was staying. I was going to parties, dances, horseback rides under the stars. One morning I collapsed. My heart! “You will have to lie in bed for a year of complete rest,” the doctor said. He didn't encourage me to believe I would ever be strong again.

In bed for a year! To be invalid—perhaps to die! I was terror-stricken! Why did all this have to happen to me? What had I done to deserve it? I swept. I was bitter. But I did go to bed as the doctor advised. A neighbor of mine, Mr. Rudolf, an artist, said to me: “You think now that spending a year in bed will be a tragedy. But it won't be. You will have time to think and get acquainted with yourself. You will make more spiritual growth in these next few months than you have made during all your previous life.”

I became calmer, and tried to develop a new sense of values. I read books of inspiration. One day I heard a radio commentator say: “You can express only what is in your own consciousness.” I had heard the words like these many times before, but now they reached down inside me and took root. I determined to think only the thoughts I wanted to live by: thoughts of joy, happiness, health. I forced myself each morning, as soon as I awoke, to go over all the things I had to be grateful for. No pain. A lovely young daughter. My eyesight. My hearing. Lovely music on the radio. Time to read. Good food. Good friends. I was so cheerful and had so many visitors that the doctor put up a sign saying that only one visitor at a time would be allowed in my cabin—and only at certain hours.

    Nine years have passed since then, and I now lead a full, active life. I am deeply grateful now for that year I spent in bed. It was the most valuable and the happiest year I spent in Arizona. The habit I formed then of counting my blessings each morning still remains with me. It is one of my most precious possessions.

    When one tried to unify gravity with quantum mechanics (量子力学), one had to introduce the idea of 'imaginary' time. If one can go forward in imaginary time, one ought to be able to turn round and go backward. This means that there can be no important difference between the forward and backward directions of imaginary time. Yet there is a big difference between the forward and backward directions of 'real time' in ordinary life. Imagine a cup of water falling off a table and breaking into pieces on the floor. If you take a film of this, you can easily tell whether it is being run forward or backward. You can tell that the film is being run backward because this kind of behavior is never observed in ordinary life.

    The explanation that is usually given as to why we don't see broken cups gathering themselves together off the floor and jumping back onto the table is that it is forbidden by the second law of thermodynamics (热力学). This says that in any closed system disorder, or entropy (熵), always increases with time. In other words, it is a form of Murphy's law: things always tend to go wrong! An intact cup on the table is a state of high order, but a broken cup on the floor is a disordered state. One can go readily from the cup on the table in the past to the broken cup on the floor in the future, but not the other way round.

    The increase of disorder or entropy with time is one example of what is called an arrow of time, something that tells the past from the future, giving a direction to time. There are at least three different arrows of time. First, there is the thermodynamic arrow of time, the direction of time in which disorder or entropy increases. Then, there is the psychological arrow of time. This is the direction in which we feel time passes, the direction in which we remember the past but not the future. Finally, there is the cosmological arrow of time. This is the direction of time in which the universe is expanding rather than contracting.

    Finding a friend doesn't seem like a difficult job. However, bad friends are easier to find than good friends these days. If you're sitting there and wondering if you have a bad friend, let me define it for you.

    A bad friend is someone whose jealousies and insecurities outweigh their love for someone. They might want to be a good friend but they're too messed up in their own head to ever actually do it. They wonder if their friends are going out without them or if they're being forgotten and left behind. People who are violently insecure don't have what it takes to be the quality of a friend.

    Bad friends are narcissistic(自恋的). They look for any opportunity to bring the conversation back to them. Worse, they might not even be aware that they're doing it. In their mind, they might think they are the best friend ever, which is truly frightening.

    Bad friends are quick-change. They're by your side when you're fun and you have something to give them but as soon as you're going through a difficult time, they will become indifferent quickly. They won't bring you cold medicine. They won't give you a ride to the doctor, everything they do is self-serving.

    If you find a friend who has these same characteristics, send them to your bad friend list immediately. Your friends are supposed to be the solution to your problems, not the source.

    I believe your twenties are a time when you need positive and helpful friends. In such a time, friendships aren't easy to maintain like they once were in school. Now we actually have to put work into it, we have to make a conscious effort to keep the friendship going. You need to ask yourself, "Is this person worth it? Do they treat me like a fool or what?" if you have doubts, try to make them clear by considering the past experiences. Toxic(有毒的) friendships do nothing but drag you down. My point is that you have to take care of yourself and stop getting in touch with your bad friends. Only surround yourself with people who bring out the best qualities in you. It may sound cruel but it's true.