Have your parents ever inspected your room to see if you cleaned it properly? Imagine having your entire houses, garage, and yard inspected at any time -- with no warning. Inspections were a regular part of lighthouse (灯塔) living, and a keeper's reputation depended on results. A few times each year, an inspector arrived to look over the entire light station.  The inspections were supposed to be a surprise, but keeper sometimes had advance notice.
           Once lighthouses had telephones, keepers would call each other to warn that the inspector was approaching. After boats began flying special flags nothing the inspector aboard, the keeper's family made it a game to see who could notice the boat first. As soon as someone spotted the boat, everyone would do last-minute tidying and change into fancy clothes. The keeper then scurried to put on his dress uniform and cap. Children of keepers remember inspectors wearing white gloves to run their fingers over door frames and  windowsills looking for dust.
           Despite the serious nature of inspections, they resulted in some funny moments. Betty Byrnes remembered when her mother did not have
 time to wash all the dishes before an inspection. At the time, people did not have dishwashers in their homes. In an effort to clean up quickly, Mrs. Byrnes tossed all the dishes into a big bread pan, covered them with a cloth and stuck them in the oven. If the inspector opened the oven door, it would look like bread was baking. he never did.
          One day, Glenn Furst's mother put oil on the kitchen floor just before the inspector entered their house. Like floor wax, the oil made the
 floors shiny and helped protect the wood. This time, though, she used a little too much oil. When the inspector extended his hand to
greet Glenn's mother, he slipped on the freshly oiled surface. "He came across that floor waving his arms like a young bird attempting
its first flight," Glenn late wrote. After he steadied himself, he shook Glenn's mother's hand, and the inspection continued as though
 nothing had happened.

    Tom was one of the brightest boys in the year,with supportive parents.But when he was 15 he suddenly stopped trying.He left school at 16 with only two scores for secondary school subjects.One of the reasons that made it cool for him not to care was the power of his peer（同龄人）group.

    The lack of right male role models in many of their lives—at home and particularly in the school environment—means that their peers are the only people they have to judge themselves against.

    They don't see men succeeding in society so it doesn't occur to them that they could make something of themselves.Without male teachers as a role model,the effect of peer actions and street culture is all-powerful.Boys want to be part of a club.However,schools can provide the environment for change,and provide the right role models for them.Teachers need to be trained to stop that but not in front of a child's peers.You have to do it one to one, because that is when you see the real child.

    It's pointless sending a child home if he or she has done wrong.They see it as a welcome day off to watch television or play computer games.Instead,schools should have a special unit where a child who has done wrong goes for the day and gets advice about his problems—somewhere he can work away from his peers and go home after the other children.

    Drug companies have spent billions of dollars searching for therapies to reverse or significantly slow Alzheimer's disease, but in vain. Some researchers argue that the best way to make progress is to create better animal models for research, and several teams are now developing mice that more closely imitate how the disease destroys people's brains.

    The US National Institutes of Health (NIH), the UK Dementia Research Institute and Jackson Laboratory (JAX) - one of the world's biggest suppliers of lab mice - are among the groups trying to genetically design more suitable mice. Scientists are also exploring the complex web of mutations(突变) that influences neurological (神经学的) decline in mice and people.

    "We appreciate that the models we had were insufficient. I think it's sort of at a critical moment right now." says Bruce Lamb, a neuro-scientist at Indiana University ~ho directs the NIH-funded programme.

    Alzheimer's is marked by cognitive impairment(认知损伤) and the build-up of amyloid-protein plaques (淀粉样蛋白块) in the brains of people, but the disease does not occur naturally in mice. Scientists get around this by studying mice that have been genetically modified to produce high levels of human amyloid protein. These mice develop plaques in their brains, but they still do not display the memory problems seen in people.

    Many experimental drugs that have successfully removed plaques from mouse brains have not lessened the symptoms of Alzheimer's disease in people. One focused stumble came last month, when three companies reported that their Alzheimer's drugs had failed in large, late-stage clinical trials. Although the drugs successfully blocked the accumulation of amyloid protein in mice, they seemed to worsen cognitive decline and brain shrinkage in people.

    The drive for better mouse models comes as genomics studies are linking the most common form of Alzheimer's to dozens of different genes. This diversity suggests that each case of the disease is caused by a different combination of genetic and environmental factors. "There is no single Alzheimer's disease," says Gareth Howell, a neuro-scientist at Jackson Laboratory (JAX) in Bar Harbor, Maine.

    Howell argues that scientists' reliance on lab mice with only a few genetically engineered mutations might have limited research. His own work suggests that in mice, just as in people, genetic diversity plays a part in determining how Alzheimer's develops.

    Living next to the Spellmans, our new neighbors, almost drove my mother crazy. If shewasn't shaming them for not attending church, or complaining to her sister Jackie about theway the Spellman girls dressed, then she was shoeing the Spellman's dogs out of our yard or filing noise complaints with the police, My mother had never been so busy.All she ever spoke of any more were the Spellmans and their wrongdoings.

    One Sunday afternoon after church service, my mother was driving old Ms Parker home to her house on the hill when we got a flat tire. As far as changing the tire, let's just say that we were at the mercy of the good Lord. Since old Ms. Parker lived so far up that hill, not a lot of traffic drove by us. It had been about fifteen minutes since the last car passed when we heard the rattling and puttering of an old pickup truck as it pulled over to assist us.

    The Spellman boys ran up on our car like a NASCAR pit crew. Before my mother could even protest, they had taken the tire off. "Her spare is flat," said the middle one to the big one. " Give her ours” replied the big one, barely acknowledging the sacrifice. My mother was stunned. "I don, t know what to say, "she stammered. The big one said, "Well, the Lord said love your neighbor, and we are neighbors, right?

    The next day when the Spellman's dogs went through my mother's flower garden, she put out a bowl of water for them. When she saw the Spellman girls walking out with nothing but a halter on, she lectured them about being upright ladies and offered them sweaters. And when she heard the Spellman's music through our walls, she tried to dance a little bit. She even invited the Spellmans to be part of the good neighbors committee. Now the neighborhood was a better place.

    After the examination, the doctor told my parents my sight would get worse and that I would lose my sight finally. On the way home from hospital, no one said a word. One day, would I only imagine the scenery beyond the glass rather than see it?

    That September, I entered middle school. Most nights I had homework that included an armful of books to read. To keep up with other children, I took great trouble to finish the task. With my nose a couple of inches from the page, I was tired easily. What's worse, after I had read several pages on my own, the words slipped off the page into inky pools.

    However, then I did not have audio books and electronic devices like kids do now. Instead, Mom volunteered to read out loud. Mom worked part time, cleaned the house, cooked and spent time with Grandma. In spite of being so busy, she showed up in my room like clockwork. She put on her reading glasses. Mom always thought those glasses made her look old. To me, she looked like a teacher.

    In my room, Mom's voice compared with the ticking of the clock. Being forced to focus on listening, I found a way to keep my marks up and compete with the other kids. When the teacher asked a question, I raised my hand with confidence. Teachers praised me for having a good memory. Reading removed my fear for my failing sight, reading also made me curious about other people's challenges and how they managed. Though I could not use my eyes to fix on each passage, my mind lit up with every new book.

    True to what the doctor said, the worst came, but thanks to Mom, my sense of hearing now allows me to “see”. This was the most precious gift from a mother to her child.

    People have grown taller over the last century, with South Korean women shooting up by more than 20cm on average, and Iranian men gaining 16.5cm. A global study looked at the average height of 18-year-olds in 200 countries 1914 and 2014. The results show that while Swedes were the tallest people in the world in 1914, Dutch men have risen from l2th place to claim top spot with an average height of 182.5cm. Larvian women, meanwhile, rose from 28th place in 1914 to become the tallest in the world a century later, with an average height of 169.8cm. James Bentham, a co-author of the research says the global trend is likely but once you average over whole populations, genetics plays a less key role," he added.

    But while height has increased around the world, the trend in many countries of north and sub-Saharan Africa causes concern, says Elio Riboli of Imperial College. While height increased in Uganda and Niger during the early 20th century, the trend has reversed in recent years, with height decreasing among 18-year-olds.

    "One reason for these decreases in height is the economic situation in the 1980s," said Professor Alexander. The nutritional and health problems that followed the policy of structural adjustment, he says, led to many children and teenagers failing to reach their full potential in terms of height.

    Bentham believes the global trend of increasing height has important implications. "How tall we are now is strongly influenced by the environment we grew up in," he said. "If we give children the best possible start in life now, they will be healthier and more productive for decades to come."