Researchers in China and the United States have developed a new cataract(白内障)treatment with cells that has restored vision in babies in a trial and may eventually be used in adults.

    The treatment- by doctors and staff members at the University of California, San Diego School of Medicine and Sichuan and Sun Yat-sen universities in China-was published in March 9 edition of the scientific journal Nature.

    A cataract is a clouding of the normally clear lens(晶体)of an eye. Typical cataract operation involves the removal of the cloudy lens and the insertion of an artificial one. The new operation has been tested in animals and during a small, human trial. It resulted in fewer complications(并发症)than the current harmful operation, and in regrown lenses with superior visual function in all 12 of the baby cataract patients who received the procedure.

    A congenital cataract- lens clouding that occurs at birth or shortly after- is important cause of blindness in children. In the new research, Kand Zhang, head of ophthalmic genetics at US San Diego's Shiley Eye Institute, and his colleagues relied on the regrown potential of endogenous(同源的)stem cells.

    According to Zhang, endogenous stem cells are different from other stem cells that are typically grown in a laboratory, transplanted into a patient, and can have risks of immune（免疫的）rejection, infection or cancers. Zhang told CBS News, “We invented a new operation to make a very small opening at the side of a cataractous lens bag, remove the cataract inside, allow the opening to heal, and promote potential lens stem cells to regrow an entirely new lens with vision.”

    The human trial involved 12 babies under the age of 2 who were treated with the new method, while 25 babies received thee standard operation care.. The latter group experienced a higher incidence of pos- operation danger, early- onset eye high blood pressure and increased lens clouding. The scientists reported fewer complications and faster healing among the 12 babies who has the new procedure.

    Many people wrongly think that cities don't have farms and fruits and vegetables are only grown in the country. Believe it or not, there are more urban farms popping up in cities all over the world.

    Alexandra Sullivan, a food systems researcher in New York, studies urban agriculture. Urban agriculture is another name for farming and gardening in a city environment. Ms. Sullivan studies everything from tiny gardens in empty lots between buildings to bigger fields that have been planted and grown. According to Ms. Sullivan, “Urban agriculture has existed since cities have, across the world.”

    The number of humans living in urban areas, or cities, is increasing. The amount of people who wanted to garden in urban areas is also rising. Ms. Sullivan says, “In small gardens, on rooftops and indoors, city residents grow fruits, vegetables, grains, and herbs, and raise animals to produce milk, eggs, honey, and meat. City residents use these foods as supplements to food produced by rural agriculture.” Even though some people who live in urban areas grow crops, urban residents still need to rely on food grown in rural areas. This is because a city doesn't have enough space to grow enough food for everyone living in it.

    In New York City, urban farmers have come up with many different ways to grow their own produce, even though there isn't a lot of room. For example, Brooklyn Grange is a farming operation that has two rooftop vegetable farms in New York City. All together, the farms are made up of 2.5 acres of rooftop space. This makes Brooklyn Grange one of the largest rooftop farming operations in the world.

    Brooklyn Grange grows all kinds of things. The farming company sells its vegetables to local residents and restaurants. And because the farms are on rooftops, they are specially adapted to their urban location. They use available space that is not needed for anything else. As more urban farmers find ways to grow food in cities, urban residents will be better able to get fresher materials for their meals.

    Born in Detroit, Michigan, on January 10, 1928. Philip Levine was formally educated in the Detroit public school system. After graduation from university, Levine worked a number of industrial jobs, including the night work in factories, reading and writing poems in his off hours. In 1953, he studied at the University of Iowa. There, Levine met Robert Lowell and John Berryman, whom Levine called his "one great guide."

    About writing poems, Levine wrote: "I believed even then that if I could change my experience into poems I would give it the value and honor that it did not begin to have on its own. I thought too that if I could write about it, I could come to understand it: I believed that if I could understand my life-or at least the part my work played in it-I could write it with some degree of joy, something obviously missing from my life."

    Levine published (出版)his first collection of poems. On the Edge in 1961, followed by Not This Pig in 1968. Throughout his life. Levine published many books of poems, winning many prizes. A review said: "Levine writes poems about the bravery of men, physical labor, simple pleasures and strong feelings, often set in working-class Detroit or in central California, where he worked or lived."

    He taught for many years at California State University, Fresno, and served as Distinguished Poet in Residence for the Creative Writing Program at New York University. After retiring from teaching, Levine divided his time between Brooklyn, New York, and Fresno, California, until his death on February 14, 2015. His final poem collection, The Last Shift, as well as a collection of essays(短文)and other writings, My Lost Poets, A Life in Poetry, were published in 2016.

    At a daycare center in Texas, children were playing outside. One of the children was Jessica Mc Clure. She was 18 months old. Her mother, who worked at the daycare center, was watching the children. Suddenly Jessica fell and disappeared. Jessica's mother screamed and ran to her.

    A well was in the yard of the center. The well was only eight inches across and a rock always covered it. But children had moved the rock. When Jessica fell, she fell right into the well.

    Jessica's mother reached inside the well, but she couldn't feel Jessica. She dialed 911 for help. Men from the fire department arrived. They discovered that Jessica was about 20 feet down in the well. For the next hour the men talked and planned Jessica's rescue.

    "We can't go down into the well," they said."It's too narrow. So, we're going to drill a hole next to the well. Then we'll drill a tunnel across to Jessica. When we reach her, we'll bring her through the tunnel and up through our hole."

    The men began to drill the hole at 11 a.m. on Wednesday, October 14, 1987. The men had a difficult job; they were drilling through solid rock. During her days in the well, Jessica sometimes asked for her mother. Sometimes she slept, sometimes she cried and sometimes she sang.

    All over the world, people waited for news of Jessica. Everyone worried about her.

At 8 p.m. on Friday, October 16, men reached Jessica and brought her up from the well. She was soon sent to hospital. Jessica was dirty, hungry, thirsty and tired. Her feet and forehead were badly injured. But Jessica was alive.

    After Jessica's rescue, one of the rescuers made a metal cover for the well, saying," To Jessica, with love from all of us."

    Homebuyers nationwide are watching housing prices go up, up, and up. "How high can they go?" is the question on everyone's lips.

    It's crazy, "said Tim, who is looking for a house near the beach. "In 1993, I bought a two-bedroom house in Venice for $70，000. My friends thought then that I was overpaying. Five years later, I had to move. I sold it for $230，000, which was a nice profit. Last year, the exact same house was for sale for S510, 000!

    It is a seller's market. Homebuyers feel like they have to offer at least 10% more than the asking price. Donna, a new owner of a one-bedroom house in Venice Beach, said, "That's what I did. I told the owner that whatever anyone offers you, I'll give you $20,000 more, under the table, so you don't have to pay your realtor(房地产经纪人) any of it. I was tired of looking.”

    Tim said, "Whether you decide to buy or decide not to buy, you still feel like you made the wrong decision. If you buy, you feel like you overpaid. If you don't buy, you want to kick yourself for passing up a great opportunity.”

    Everyone says the bubble has to burst sometime, but everyone hopes it will burst the day after they sell their house. Even government officials have no idea what the future will bring. "All we can say is that, inevitably, these things go in cycles," said the state director of housing. "What goes up must come down But, as we all know, housing prices always stay up a little higher than they go down. So you can't lose over the long run. Twenty years down the road, your house is always worth more than you paid for it.”

Chinese President Xi Jinping once said. "Heroes come from the people." Every year, there are ordinary people spreading positive energy (正能量) and touching our hearts. Let's take a look at some of them.