Work started this week on next season's flu vaccine (疫苗), with experts working off forecasts about which types of the flu virus will be making the rounds. But don't expect any improvements. Flu experts are already admitting that most vaccines will give at best basic protection, because they're based on old-fashioned technology. It's not a new problem, but one that the slow-moving world of drug and vaccine production seems helpless to improve upon.

    Every flu vaccine is a cocktail, aimed at either three or four of the most common flu types. Flu vaccines must be recreated every year because flu viruses develop constantly in a process called antigenic drift. In February, global flu experts gather to trade notes on what viruses are circulating in different countries and to come to an agreement on which types the next vaccines should be made to target.

    In recent years, flu vaccines have been based on H1N1, H3N2 and either one or two types of influenza B virus. Each of these has a "reference" type, which is used to make seed virus. Producers add the seed types to eggs and incubate (孵) them as the virus grows. Then they purify the virus, and either weaken it or kill it to make a vaccine.

    Using eggs is a tricky (=difficult) and unpredictable process. Sometimes the virus doesn't grow well in eggs, which can mean less vaccine than expected. The result is a flu vaccine that doesn't offer much protection. "As long as we have eggs we are going to have this problem," said Scott Hensley, a flu virus expert, "The only solution is not to depend on eggs."

    Flu is a major killer. The 2017-2018 season has been a severe one, hitting the entire U. S. with widespread influenza infection (感染) at once for weeks on end, and killing 97 children so far. Against this threat, even a less satisfying flu vaccine will definitely help. "Even when you have these mismatches it will not prevent infection but likely prevent disease severity," said Hensley.

In many ways, Providence Mount St. Vincent in Seattle is a typical senior living community. It is home to about 400 elderly people and provides them with different types of assistance. However, it is also the Inter-generational Learning Center—a preschool where children and seniors have the chance to bond（结成友好的关系）.

    Established in 1991, the ILC's purpose is to allow kids to learn about acceptance while also being nurtured. It also aims to help seniors develop a greater sense of self-worth and strengthen social interactions. Babies to prekindergarten-aged children are placed into six different classes at the ILC. The kids attend art and music classes, as well as story time and exercise time with the seniors. Marie Hoover, ILC director, said that interacting with the seniors has proven beneficial for the young ones, making them more open-minded.

    “For the ILC children, interacting with the residents is simply part of their day-to-day life here and the way aging is 'normalized', which may be the most important benefit they receive,” Hoover said.“ I've had parents call me years after their children have graduated from our program to let me know about some incidents when their child was the first to warmly greet someone who happened to be in a wheelchair.”

    As for the seniors, they're delighted by the companionship the children provide. The children bring so much energy and joy to our residents. Many of residents are widows or widowers and can become lonely. Their adult children may still be working, so they may not get to see them as often as they would like. Having the children stay with the old makes our residents feel they are still part of a community. The young and the old connect and learn from one another at this unique facility.

    Have you ever been faced with trying to stay positive when others around you are negative? A negative person can bring you down and throw your positive plans out of the window. Whether you deal with a family member, friend or co-worker who is negative, there are things you can do to remain positive in the face of negativity?

    Whatever you do, don't argue with a negative person. Arguing only adds fuel to the fire. I have noticed when my children are crabby, it is best to avoid trying to convince them to analyze and adjust their attitude. As soon as I take the approach of being in opposition to them, the situation gets worse before it gets better. Sometimes the best thing to do is remain silent and let negativity pass.

    You know how difficult it can be to give love and positive attention to negative people. Unfortunately, that is often exactly what they need. A negative person is usually afraid he is unlovable. How do you show love when someone is negative? You must listen to what he is trying to tell you. Acknowledge the feelings he has by saying something like, “You sound very angry right now.” How might you help a negative person? Offer a hug even if you get rejected. A negative person often has difficulty accepting love from others.

If you have negative people on your life who are affecting your mental and physical health, you need to decide whether or not you want these people in your life. Some people are so negative that you have no other choice but to remove them from your life. However, some people, such as your children, are difficult to remove from your life, in this case, professional counseling(咨询) may be the answer.

    Teen Art Show

    Do you want to see your artwork displayed alongside other teens' artwork? Don't miss your opportunity! Showcase your paintings, sculptures, photographs and other artworks at the Environmental Educational Center. The show will provide an opportunity for artists to network, provide feedback and become a resource for others.

    Activity fee: $25

    Night Fishing

    Escape the night and join us as we fish at Desert Breeze Park. No experience needed. We will provide the fishing poles, transportation, the bait, help you catch a fish and best of all, teens 14 years and under do not require a license to fish.

    Location: Desert Breeze Park

    Activity fee: $22

    Overnight Snow Trip

    Join the City of Chandler in an exciting new trip! We will travel up to Camp Tontozona and enjoy great food and a campfire in the early evening. Snow play will be the highlight as we explore the snow-filled meadows(草地) of Woods Canyon Lake and sled down small hills in the area. You will be responsible for your own ski/snowboard equipment.

    Location: Camp Tontozona

    Activity fee: $30

    Paintballing

    Come out and play paintball with all your friends! Join the City of Chandler as we go to Tempe Indoor Paintball. This is a great way to join in the fun of playing paintball for a low, low cost. All equipment is included. Please wear old clothes because clothes can get dirty easily!

    Location: Tempe Paintball

    Activity fee: $28

    A dog spent the last four years of his life waiting a crossroad in the Thai city of Khon Kaen as if waiting for someone. People originally thought the dog had been abandoned, but then realized that he looked healthy, so people asked around about him. It turned out that the dog had indeed been spending most of his time around that crossroad, but a woman had been coming -.round regularly to bring him food and water.

    One day, while photographing the dog everyone called Leo, a reporter met the woman who had been taking care of him. She had come to drop off some food. After learning the story about the dog and the woman, the reporter decided to share the story on social media. The post soon went viral and the photos of Leo got shared hundreds of times. And the photos reached the eyes of Leo^ former old owner.

    Nang Noi Sittisarn, a 64-year-old woman from Thailand's Roi Et Province, almost had a heart attack when her daughter showed her a photo of the beloved dog named BonBon she had lost during a car trip. When she learned that he had been waiting for her in the same spot for the last four years，her heart melted(融化).

    Auntie Noi told her daughter to drive her to where the dog was waiting. When she got there and called his name. BonBon, the poor dog started wiggling(扭动)his tail and came to her，but when she tried to take him home with her, he was unwilling to follow. She didn't want to force the dog to come with her so she agreed to leave him with his new master. However, she and her daughter will come to visit him regularly.

As the Chinese saying goes, a seed can change the world; a variety can benefit a nation.

Zhang Daorong, who has spent the last 26 years 1 13 new varieties of wheat and contributing to national food security, has done both. The 50-year-old, who is called the "mother of wheat", is a 2 at the Xiangyang Academy of Agricultural Sciences in Xiangyang city.

The research into new varieties requires strict standards and 3 experiments. "The first 4 is to find suitable parental types for a specific cultivation(培育) purpose. Then we try a hybrid(杂交的) combination," Zhang explained, "After several generations of 5 and selection, and when characteristics remain stable, we 6 a two-year process of yield testing and disease identification." And after several more founds of tests, a(n) 7 for evaluation and approval can be made for market production.

"Generally speaking, a good new 8 should produce high yields(产量), have stable production, and 9 good resistance to bad conditions," she added. "10 , it also should be accepted by the market."

Zhang added that the team 11 70,000 to 80,000 seedlings(幼苗) each year. All year round they were busy with 12 experiments on the growth of the new seedling sand making records and analyses.

"Agricultural research work is 13 and complicated. Sometimes your efforts do not 14 . All we can do then is think more, discuss more and find 15 on the land," she said.