Disposing (处理) of waste has been a problem since humans started producing it. As more and more people choose to live close together in cities，the waste disposal problem becomes increasingly difficult.

    During the eighteenth century，it was usual for several neighboring towns to get together to select a faraway spot as a dump site. People would transport household rubbish，rotted wood and old possessions to the site. Regularly some of the trash was burned and the rest was buried. The unpleasant sights and smells caused no problem because nobody lived close by. Factories and some other industrial sites also had waste to be disposed of. Those located on rivers often just poured the unwanted remains into the water. Others built huge burners with chimneys to deal with the problem.

    Several facts make these choices unacceptable to modern society. The first problem is space. Dumps(垃圾场)， are most needed in heavily populated areas. Such areas rarely have empty land suitable. Farm areas are refusing to accept rubbish from elsewhere，cheap land in major city areas to dispose wastes is nonexistent(不存在的). Awareness of pollution dangers has resulted in more strict rules of waste disposal. Pollution of rivers，ground water，land and air is a price people can no longer pay to get rid of waste. The amount of waste，however， continues to grow.

    Recycling efforts have become commonplace，and many towns require their people to take part. Even the most efficient recycling programs，however，can hope to deal with only about 50 percent of a city's reusable waste，so more people should be involved in recycling programs.

    My son Cameron who was 16 years old came up with this crazy idea to make his own survival show. Well I thought it was just another one of his “phases” but he began to sound more and more serious about it. He's a big outdoors man and has always loved the idea of surviving in the woods by himself, but he has never done anything like this. Anyway, he somehow raised $4,000 for his idea. With the money he bought a nice camcorder(摄像机) ;that's when I realized that he was really serious about this whole thing.

    Cameron organized the trip all by himself. I just put out a few rules that he had to follow and rented a satellite phone so that he could contact us on his journey. My son traveled nearly 50 miles, while surviving for four days and three nights alone in the wilderness. He had no food or water, only his knife, and a camera. The journey was difficult as he traveled through valleys, up and down big waterfalls, all while he was filming his entire journey. The wilderness we dropped him off in was a wild forest that is made up of untouched land; he found his way to the beautiful lake where we picked him up. In the end he made the most amazing movie that I have ever seen in all my life.

    My son's courage should be recognized. That is why I am trying my hardest to get him seen by the rest of the world. Cameron recently turned 17. He already has plans for his next adventure and I have no hope in stopping him from completing it. This next summer he plans on surviving for two or three weeks on a desert island in Fiji or Tonga. No teenage kid has ever done anything close to what my son Cameron has done.

    What do you usually do to comfort your friends when they are sad? You probably pat them on the shoulder, or give them a warm hug.

    We used to think that knowing when and how to comfort others was an ability that only humans have. But scientists have discovered that apes (猩猩) have this ability too.

    Two researchers from Emory University in Atlanta, US, went to an Ape Protection Centre in Congo to study bonobos (倭黑猩猩), which are closely related to humans.

    The researchers analyzed the bonobos' reactions (反应) after more than 370 cases of stressful situations, such as fights and losing temper, and found that some bonobos rushed to hug those that were screaming after being attacked, just like humans would have done.

    However, researchers found that not all bonobos were able to comfort others. In the protection center, many bonobos are orphans whose mothers were killed by hunters. They were found to be more worried in times of tension and have greater difficulty controlling their own emotions, making them worse at reaching out to help friends in need.

    "Orphans, who have not had the benefit of a mother helping them handling their emotions, are much worse at comforting others," Professor Frans de Waal told TheTelegraph. "Bonobos with moms were able to curb their negative emotional reactions more quickly. Therefore, they pay more attention to others."

    This pattern mirrors the way that human children have been found to react. Those who are good at handling their own emotions—for example, those who can calm themselves down more quickly after upsetting experiences—are usually better at expressing their concerns for others.

    No one has a temper naturally so good, that it does not need attention and cultivation, and no one has a temper so bad, but that, by proper culture, it may become pleasant. One of the best disciplined tempers ever seen, was that of a gentleman who was naturally quick, irritable, rash, and violent; but, by taking care of the sick, and especially of mentally deranged(疯狂的) people, he so completely mastered himself that he was never known to be thrown off his guard.

    There is no misery so constant, so upsetting, and so intolerable to others, as that of having a character which is your master. There are corners at every turn in life, against which we may run, and at which we may break out in impatience, if we choose.

    Look at Roger Sherman, who rose from a humble occupation to a seat in the first Congress of the United States, and whose judgment was received with great respect by that body of distinguished men. He made himself master of his temper and cultivated it as a great business in life. There are one or two instances which show this part of his character in a light that is beautiful.

    One day, after having received his highest honors, he was sitting and reading in his sitting room. A student, in a room close by, held a looking­glass in such a position as to pour the reflected rays of the sun directly in Mr. Sherman's face. He moved his chair, and the thing was repeated. A third time the chair was moved, but the looking­glass still reflected the sun in his eyes. He laid aside his book, went to the window, and many witnesses of the rude behavior expected to see the ungentlemanly student severely punished. He raised the window gently, and then—shut the window blind!

    I can not help providing another instance of the power he had acquired over himself. He was naturally possessed of strong passions, but over these he at length obtained an extraordinary control. He became habitually calm and self­possessed. Mr Sherman was one of those men who are not ashamed to maintain the forms of religion in their families. One morning he called them all together as usual to lead them in prayer to God. The "old family Bible" was brought out and laid on the table.

    Mr Sherman took his seat and placed beside him one of his children, a child of his old age. The rest of the family were seated around the room, several of whom were now grown­ups. Besides these, some of the tutors of the college were boarders in the family and were present at the time. His aged mother occupied a corner of the room, opposite the place where the distinguished Judge sat.

    At length, he opened the Bible and began to read. The child who was seated beside him made some little disturbance, upon which Mr Sherman paused and told it to be still. Again he continued but again he had to pause to scold the little offender, whose playful character would scarcely permit it to be still. At this time he gently tapped its ear. The blow, if blow it might be called, caught the attention of his aged mother, who now with some effort rose from the seat and tottered across the room. At length, she reached the chair of Mr Sherman, and in a moment, most unexpectedly to him, she gave him a blow on the ear with all the force she could gather. "There," said she, "you strike your child, and I will strike mine."

    For a moment, the blood was seen mounting to the face of Mr Sherman. But it was only for a moment and all was calm and mild as usual. He paused; he raised his glasses; he cast his eye upon his mother; again it fell upon the book from which he had been reading. Not a word escaped him; but again he calmly pursued the service, and soon sought in prayer an ability to set an example before his household which should be worthy of their imitation. Such a victory was worth more than the proudest one ever achieved on the field of battle.

    "The history of the world is but the biography (传记) of great men," argued Thomas Carlyle, the advocate of what has come to be known as the "Great Man Theory of History." This theory suggests that the broader movements and outline of history all go back to the leadership of great individuals who had unique influence on their times. Whether or not Carlyle's theory proves true is debatable, but that certain individuals cast long shadows is not.

    As one who is entrusted with a leadership position, I find it profitable to read of others who have led. Wherever you find me, you'll likely find a good biography nearby. Why is this the case? First, I find good biographies fascinating. I'll occasionally read a novel, but I've never been overly drawn to fiction. I have found myself unable to sleep while in the struggle of the Battle of Britain in William Manchester's The Last Lion. For me, not to read biographies would rob me of pleasure in my life.

    Second, I find good biographies informative. A good biographer tells not only the story of a person, but also of their times. Reading a good biography is like wandering through an intellectual shopping mall. The first store is what drew you there, but you will be pleasantly surprised along the way at what other items grab your attention. You'll find no better account of the British Empire at its peak than the opening chapters of Manchester's Visions of Glory, volume one of his The Last Lion. Strictly speaking, a biography is but a slice of history.

    Third, I find good biographies relaxing. Winston Churchill once noted a man who works with his hands should have a hobby that engages his mind, and a man who works with his mind should have a hobby that engages his hands. Another way to apply Churchill's saying is to combine technical, pen-in-hand vocational reading with leisurely biographical reading. Indeed, few things are more relaxing to me than winding down the evening and entering into another world.

    This is why I love reading good biographies, and why I pity the person who neglects them. Don't be counted among their number.

    Nowadays six Amazon Scout delivery robots rolled out in a pilot program in Snohomish County, Wash. The robots carry meals, groceries and packages to homes and offices in this region just north of Seattle. They have appeared on the sidewalks of London, Beijing and other cities and communities worldwide. These machines must overcome pedestrian legs, naughty dogs and broken pavement, which raises some questions.

    These services are gaining attraction as a growing number of city residents expect immediate or scheduled delivery for just about everything. Between 2017 and 2018 online retail sales in the U.S. increased by 16 percent. On the final step of all these deliveries, called the last mile, humans on bicycles, motorized scooters (电动车) or large delivery trucks typically deliver packages. All the vehicles compete for space on busy urban streets. "Deliveries are trending upwards in all crowded city centers, and if city and state leaders don't start thinking about creative solutions like robot deliveries, we can expect even worse traffic jams," says Paul Mackie, director of a transportation policy research center in Arlington.

    A study by this center found 73 percent of delivery vehicles in Arlington were parked outside of authorized areas, often blocking bike lanes and crosswalks. By moving the last step of deliveries from the road to the sidewalk, cities could reduce traffic jams and solve the parking problem entirely, Mackie says.

    Companies such as Amazon are not developing this delivery technology simply to clear up urban traffic. Self-driving vehicles and sidewalk robots could cut down last-mile delivery costs in cities by as much as 40 percent, according to a 2018 report by a consultancy firm. A delivery robot can cost thousands of dollars to manufacture, and most currently require human management and conservation. But in the long run companies that use autonomous delivery vehicles in the next several years could end up saving billions of dollars, the report stated.