To whom it may concern,

    My husband Jim and I got married in 1965. For the first ten years of our marriage, I was very happy to stay home and raise our three children. Then about four years ago, our youngest child went to school, and I thought I might go back to work.

    Jim was very supportive and helped me to make my decision. He started to do all the things I used to do around the house, and said he thought I could be a great success in business.

After several weeks of job hunting, I found my present job, which is working for a small public relation firm. At first, my husband was proud of me and would tell his friends, "My clever little wife can run that company she's working for."

    But, as his joking words were becoming reality, Jim stopped talking to me about my job. I have received several promotions and pay increases, and I am now making more money than he is. I can buy my own clothes and a new car. Because of our combined incomes, Jim can do things that we had always dreamed of doing, but we don't do these things because he is unhappy.

    We fought about little things, and Jim is very critical of me in front of our friends. For the first time in our marriage, I think there is a possibility that our marriage may come to an end.

    I love Jim very much, and I don't want him to feel inferior(较差的), but I also love my job. I think I can be a good wife and a working woman, but I don't know how. Can you give me some advice? Will I have to choose one or the other or can I keep both my husband and my new career?

    Please help.

Yours,

Mary

    As a young boy, I sometimes traveled the country roads with my dad. He was a rural mill carrier, and on Saturdays he would ask me to go with him. Driving through the countryside was always an adventure: There were animals to see, people to visit, and chocolate cookies if you knew where to stop, and Dad did.

    In the spring, Dad delivered boxes full of baby chickens, and when 1 was a boy it was such a fun to stick your finger 'through one of the holes of the boxes and let the baby birds peck on your fingers.

    On Dad' s final day of work, it took him well into the evening to complete his rounds because at least one member from each family was waiting at their mailbox to thank him for his friendship and his years of service. "Two hundred and nineteen mailboxes on my route." he used to say, "and a story at every one. " One lady had no mailbox, so Dad took the mail in to her every day because she was nearly blind. Once inside, he read her mail and helped her pay her bills.

Mailboxes were sometimes used for things other than mail. One note left in a mailbox read. "Nat, take these eggs to Marian; she's baking a cake and doesn't have any eggs. " Mailboxes might be buried in the snow, or broken, or lying on the groom:. bat the mail was always delivered On cold days Dad might find one of his customers waiting for him with a cup of hot chocolate. A young wrote letters but had no stamps, so she left a few button on the envelope in the mailbox; Dad paid for the stamps. One businessman used to leave large amounts of cash in his mailbox for Dad to take to the bank. Once, the amount came to 8 32,000.

    A dozen years ago, when I traveled back to my hometown on the sad occasion of Dad's death,  the mailboxes along the way reminded me of some of his stories. I thought I knew them all, but that wasn't the case.

    As I drove home, I noticed two lamp poles, one on each side of the street. When my dad was around, those poles supported wooden boxes about four feet off the ground. One box was painted green and the other was red, and each had a long narrow hole at the top with white lettering: SANTA CLAUS, NORTH POLE. For years children had dropped letters to Santa through those holes.

    I made a turn at the comer and drove past the post office and across the railroad tracks to our house. Mom and I were sitting at the kitchen table when I heard footsteps. There, at the door, stood Frank Townsend, Dad's postmaster and great friend for many years. So we all sat down at the table and began to tell stories.

    At one point Frank looked at me with tears in his eyes. " What are we going to do about the letters this Christmas?" he asked.

    "The letters?"

    'I guess you never knew. "

    "Knew what?"

    " Remember, when you were a kid and you used to put your letters to Santa in those green and red boxes on Main Street? It was your dad who answered all those letters every year. "

    I just sat there with tears in my eyes. It wasn't hard for me to imagine Dad sitting at the old table in our basement reading those letters and answering each one. I have since spoken with several of the people who received Christmas letters during their childhood, and they told me how amazed they were that Santa had known so much about their homes and families.

For me, just knowing that story about my father was the gift of a lifetime.

    At 29 years old, Ding Ding, who has cerebral palsy (脑瘫), has been accepted to Harvard University. Ding Ding succeeded in his academic studies and overcoming many of his physical disabilities because of his mother's persistence(坚持不懈) and endless love.

    In 1988, when Ding Ding was found born with cerebral palsy, Doctors suggested to his mother Zou Hongyan that she give up the baby, saying it was worthless trying to rescue him as he would grow up either disabled or with low intelligence. Even the boy's father agreed with the doctors and told Zou that the boy would be a burden for the family for his entire life. But Zou insisted on saving the boy and soon divorced (离婚).

    To support the family and provide treatment for her son, Zou took up several jobs. In her spare time, she regularly took Ding to a recovery hospital. She taught herself how to exercise his muscles, and would also play educational games with him.

    Zou also insisted from the start that her son would learn to overcome his disabilities as far as possible. She insisted on teaching him how to use chopsticks during mealtimes, even though he found this extremely difficult at first, so he would not have to always explain his disability to others when he had meals with them.

    "I didn't want him to feel sorry for his physical problems," she said. "Because he had poor abilities in many areas, I was quite strict on him to work hard to catch up where he had difficulties. "

    Ding graduated with a degree in environmental science from Peking University's school of engineering in 2011. That same year, he took part in a second degree program at the university's international law school. In 2016, after working for two years, Ding was accepted into Harvard Law School.

    "I never dared to dream of applying to Harvard," Ding said. "It was my mother who never stopped encouraging me to give it a try. Whenever I had any doubts, she would guide me forward."

    Self-driving cars have been backed by the hope that they will save lives by getting involved in fewer crashes with fewer injuries and deaths than human-driven cars. But so far, most comparisons between human drivers and automated vehicles have been unfair.

    Crash statistics for human-driven cars are gathered from all sorts of driving situations, and on all types of roads. However, most of the data on self-driving cars' safety have been recorded often in good weather and on highways, where the most important tasks are staying in the car's own lane and not getting too close to the vehicle ahead. Automated cars are good at those tasks, but so are humans.

    It is true that self-driving cars don't get tired, angry, frustrated or drunk. But neither can they yet react to uncertain situations with the same skill or anticipation of an attentive human driver. Nor do they possess the foresight to avoid potential perils. They largely drive from moment to moment, rather than think ahead to possible events literally down the road.

    To a self-driving car, a bus full of people might appear quite similar to an uninhabited corn field. Indeed, deciding what action to take in an emergency is difficult for humans, but drivers have sacrificed themselves for the greater good of others. An automated system's limited understanding of the world means it will almost never evaluate (评估) a situation the same way a human would. And machines can't be programmed in advance to handle every imaginable set of events.

    Some people may argue that the promise of simply reducing the number of injuries and deaths is enough to support driverless cars. But experience from aviation (航空) shows that as new automated systems are introduced, there is often an increase in the rate of disasters.

    Therefore comparisons between humans and automated vehicles have to be performed carefully. To fairly evaluate driverless cars on how well they fulfill their promise of improved safety, it's important to ensure the data being presented actually provide a true comparison. After all, choosing to replace humans with automation has more effects than simply a one-for-one exchange.

    A society that lives by the plastic fork may very well die from it. That's how things are looking. Anyway, for a world so used to disposable(一次性的) habits, any hope for a solution(解决方案) also increasingly seems to be buried.

    Sure, there have been some hopeful ideas. Boyan Slat, the Dutch inventor developed a plan for Covering the Great Pacific Garbage Patch. Not long after it started, Slat's system experienced "material fatigue(疲劳)"-likely the result of being strained(使受到压力) by all that trash-and the task was delayed.

    All the while, the plastic increases. Its growth is very fast, according to Linda Wang, a professor of chemical engineering at Purdue University. She says, "We'll have more plastic than fish by 2050." Yet Wang, along with other researchers at Purdue, may have a solution not only to this plastic problem, but also to the growing need for clean energy.  Her team has developed a system that turns waste, a durable, lightweight material that accounts for about a quarter of all plastic waste, into a highly pure form of gasoline.

    Publishing their findings in the journal Sustainable Chemistry and Engineering, the scientists' state that instead of making plastic go away, they can break it down and reuse it, using chemistry to destroy what chemistry brought to the world when plastic was developed back in 1907.

    The process uses "supercritical" water-heated to around 450 degrees Celsius (842 degrees Fahrenheit),beyond the key point at which distinct liquid and vapor phases(气液态) exist-to boil plastic waste into an oil, the researchers explain. It takes a couple of hours for the supercritical water to complete the transformation, but the result is a kind of oil that can be used as gasoline or fuel. It can also be turned into other products.

    The researchers have only made the transformation in a laboratory setting so far, but they suggest turning the process to a commercial scale(规模) may not be far off. And considering the 300 million tons of plastic into the environment every year, that day can't come soon enough. But it will come in time.