When milk arrived on the doorstep

    When I was a boy growing up in New Jersey in the 1960s, we had a milkman delivering milk to our doorstep. His name was Mr.Basille. He wore a white cap and drove a white truck. As a 5-year-old boy, I couldn't take my eyes off the coin changer fixed to his belt. He noticed this one day during a delivery and gave me a quarter out of his coin changer.

    Of course, he delivered more than milk. There was cheese, eggs and so on. If we needed to change our order, my mother would pen a note-"Please add a bottle of buttermilk next delivery"—and place it in the box along with the empty bottles. And then, the buttermilk would magically appear.

    All of this was about more than convenience. There existed a close relationship between families and their milkmen. Mr. Basille even had a key to our house, for those times when it was so cold outside that we put the box indoors, so that the milk wouldn't freeze. And I remember Mr. Basille from time to time taking a break at our kitchen table, having a cup of tea and telling stories about his delivery.

    There is sadly no home milk delivery today. Big companies allowed the production of cheaper milk thus making it difficult for milkmen to compete. Besides, milk is for sale everywhere, and it may just not have been practiced to have a delivery service.

    Recently, an old milk box in the countryside I saw brought back my childhood memories. I took it home and planted it on the back porch. Every so often my son's friends will ask what it is. So I start telling stories of my boyhood, and of the milkman who brought us friendship along with his milk.

    The American state of Colorado is considering a ban on smartphones for children younger than 13.

    A Denver-based doctor - and father - is leading the effort. Tim Farnum is the founder of a group called ‘Parents Against Underage Smartphones.' His proposal would ban sales of smartphones to children under the age of 13. It would also ban sales to anyone who wishes to buy such a device for anyone younger than 13. The measure would also require sellers of smartphones to provide proof to the state government that they have asked buyers if the phone is for anyone under 13.

    The measure now needs about 300,000 signatures in order to appear on Colorado's statewide ballot (投票权)next year. If it makes the ballot and is approved by voters, Colorado would become the first state to have such a ban.

    Tim Farnum said he decided to push for the measure after watching his own children struggle with the mental effects of always having a smartphone around. "They would get the phones and lock themselves in the room and change who they were," he told The Coloradoan newspaper.

    State Senator John Kefalas, a Democrat, said he understands the reasoning behind the proposed law. However, he told The Coloradoan that a child's smartphone usage is a "family matter" and not something the government should decide. "Ultimately, this comes down to parenting,” he said, “making sure their kids are not putting themselves at risk.”

    Last year, the AAP (the American Academy of Pediatrics) released guidelines for media use by children. The group advised parents to limit time spent watching videos to no more than one hour a day of high-quality programming until age 6. After that, it said, parents should set reasonable time limits for their children and make sure electronic devices do not take time away from sleep or exercise.

C

Plastic-Eating Worms

    Humans produce more than 300 million tons of plastic every year. Almost half of that winds up in landfills(垃圾填埋场), and up to 12 million tons pollute the oceans. So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.

    Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms' chewing alone was not responsible for the polyethylene breakdown, the researchers made some worms into paste(糊状物) and applied it to plastic films. 14 hours later the films had lost 13% of their mass — apparently broken down by enzymes (酶) from the worms' stomachs. Their findings were published in Current Biology in 2017.

    Federica Bertocchini, co-author of the study, says the worms' ability to break down their everyday food — beeswax — also allows them to break down plastic. ＂Wax is a complex mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there as well, ＂she explains, ＂The wax worm evolved a method or system to break this bond. ＂

    Jennifer DeBruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared with previous studies, she finds the speed of breaking down in this one exciting. The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?

    Bertocchini agrees and hopes her team's findings might one day help employ the enzyme to break down plastics in landfills. But she expects using the chemical in some kind of industrial process — not simply ＂millions of worms thrown on top of the plastic.＂

    I study English literature at university and have always been proud of Britain's literary heritage（文学遗产）. Some British authors that you may have heard of are Charles Dickens and Jane Austen. These writers are famous all over the world because their books have been translated into many different languages. In the UK, their novels are celebrated as some of the best that have ever been written. We say that these novels are “classic” because they are still read and enjoyed years after their publication.

    I read classic novels because they are part of my university lessons but also because I enjoy them. They can teach you a lot about how people used to live and what society was like in the past. Novels like Hard Times by Charles Dickens remind us of the poverty in London during the Industrial Revolution while Jane Austen's fiction shows us what family life was like in the 18th century.

    Classic novels usually have memorable stories land interesting characters. One of my favourite books is Charles Dickens Great Expectations. It is about a boy called Pip who suddenly receives a lot of money from a mysterious supporter. As he grows up, his character changes: he becomes quite selfish and mean. Another important character is Miss Havisham. When she was young, her fiancé ran away on their wedding day. She lives in a dark house and still wears her wedding dress. She is a fascinating character, both sad and scary.

    Reading classic novels enriches my knowledge and life experience. And it has become part of life.

    If a person who lived 200 years ago was treated for a seizure(癫痫)today, they would be surprised by the treatment's freshness. That's because doctors in the 1800s were influenced more by original medical beliefs than science.

    Rather than thinking the brain caused seizures, people in the 1800s still thought they were the result of strange forces. They associated seizures with the work of evil spirits. Others felt that the seizures had a cosmic or lunar cause. They believed that the cycles of the moon and stars could make someone have a seizure.

    During a process to treat a patient who has seizures, doctors would force the patient to pray for the grace of the God. They thought if the patient did this, then the patient would rid themselves of the evil spirits causing the seizures.

    The arrival of modern psychiatry(精神病学) occurred during the 1800s. At that time people who suffered from seizures were placed in psychiatric hospitals. They were treated like they were mad. However, none of the out-of-date treatments worked.

    It wasn't until the late 1850s that the causes of seizures were understood. We know today that these causes are related to the brain. Misfired signals from the brain cause a jerking reflex(反射) in the body. These usually occur when someone is very tired.

    Once the causes of seizures were known, definitive treatments were developed. Today, treatments range from taking pills to having surgery. Treatment is personalized according to the type of seizure the patient has.

    Even today, some people are unsure about seizures. Their most common mistake is thinking that a person having a seizure will swallow their tongue. They often push some implement roughly in the person's mouth. However, this doesn't help. The implement often blocks the airway and prevents the person from breathing. Yet most of the public no longer fear people who have seizures. Instead, they can now help and comfort a person if they have a seizure.

The history of Chinese poetry dates back almost 2,700 years 

{#blank#}1{#/blank#} the Spring and Autumn Period (770 BCE-476 BCE). Records are rare before that time {#blank#}2{#/blank#} Qinshihuang destroyed all the books that could {#blank#}3{#/blank#} (locate). The styles, rules and regulations for Chinese poetry gradually {#blank#}4{#/blank#} (change) over the centuries until the time of the Tang Dynasty (618 AD-907 AD). This became the golden age for Chinese poetry. During that time a number of {#blank#}5{#/blank#} (product) poets turned out as many as 50,000 classical poems. All aspects of Chinese society {#blank#}6{#/blank#}(high) regarded these poets. Seven-character lines became very popular. 

Poetry, painting and calligraphy are three of these art forms that go particularly well together. Many poets were also excellent {#blank#}7{#/blank#} (paint) and calligraphers. A poem would be written for {#blank#}8{#/blank#} purpose of matching a painting and then written into the forefront of the painting with traditional Chinese calligraphy. This gives the paintings deeper 

{#blank#}9{#/blank#} (mean) and more elegance. It is common {#blank#}10{#/blank#} (find) this type of art hanging in people's homes.