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.

    We produce 500 billion of plastic bags in a year worldwide and they are thrown away polluting oceans, killing wildlife and getting dumped in landfills where they take up to 1,000 years to decompose. Researchers have been unsuccessfully looking for a solution.

    The 16-year-old Canadian high school student, Daniel Burd, from Waterloo Collegiate Institute, has discovered a way to make plastic bags degrade(降解) in as few as 3 months, a finding that won him first prize at the Canada Wide Science Fair, a ＄10,000 prize, a ＄20,000 scholarship, and a chance to revolutionize a major environmental issue.

    Burd's strategy was simple: Since plastic does eventually degrade, it must be eaten by microorganisms(微生物)．If those microorganisms could be identified, we could put them to work eating the plastic much faster than under normal conditions.

    With this goal in mind, he grounded plastic bags into a powder and concocted(调制) a solution of household chemicals, yeast(酵母) and tap water to encourage microbes growth．Then he added the plastic powder and let the microbes work their magic for 3 months．Finally, he tested the resulting bacterial culture on plastic bags, exposing one plastic sample to dead bacteria as a control．Sure enough, the plastic exposed(暴露) to the live bacteria was 17% lighter than the control after six weeks.

    The inputs are cheap, maintaining the required temperature takes little energy because microbes produce heat as they work, and the only outputs are water and tiny levels of carbon dioxide.

    “Almost every week I have to do chores and when I open the closet door, I have piles of plastic bags falling on top of me．One day, I got tired of it and I wanted to know what other people are doing with these plastic bags．The answer: not much．So I decided to do something myself.” Said Daniel Burd.

    Exposing living tissue to subfreezing temperatures for long can cause permanent damage. Microscopic ice crystals (结晶体) cut cells and seize moisture (潮气), making donor organs unsuitable for transplantation. Thus, organs can be made cold for only a few hours ahead of a procedure. But a set of lasting new antifreeze compounds (化合物)—similar to those found in particularly hardy (耐寒的) animals—could lengthen organs' shelf life.

    Scientists at the University of Warwick in England were inspired by proteins in some species of Arctic fish, wood frogs and other organisms that prevent blood from freezing, allowing them to flourish in extreme cold. Previous research had shown these natural antifreeze molecules (分子) could preserve rat hearts at -1.3 degrees Celsius for up to 24 hours. But these proteins are expensive to extract (提取) and highly poisonous to some species. “For a long time everyone assumed you had to make synthetic (人造的) alternatives that looked exactly like antifreeze proteins to solve this problem, ”says Matthew Gibson, a chemist at Warwick who co-authored the new research. “But we found that you can design new molecules that function like antifreeze proteins but do not necessarily look like them.”

    Most natural antifreeze molecules have a mixture of regions that either attract or repel water. Scientists do not know exactly how this process prevents ice crystal formation, but Gibson thinks it might throw water molecules into push-pull chaos that prevents them from tuning into ice. To copy this mechanism, he and his colleagues synthesized spiral-shaped molecules that were mostly water-repellent—but had iron atoms at their centers that made them hydrophilic, or water-loving. The resulting compounds were surprisingly effective at stopping ice crystals from forming. Some were also harmless to the roundworm Caenorhabditis elegans, indicating they might be safe for other animals.

    “These compounds are really cool because they are not proteins—they are other types of molecules that nonetheless can do at least part of what natural antifreeze proteins do, ”says Clara do Amaral, a biologist at Mount St. Joseph University, who was not involved in the research. Gibson's antifreeze compounds will still need to be tested in humans, however, and may be only part of a solution. “We don't have the whole picture yet,”do Amaral adds. “It's not just one magical compound that helps freeze-tolerant organisms survive. It's a whole suite of adaptations.

Dear Derrick ,

    Although under great pressure, we all get on well with each other in this large office. You are one of the people who keep the social temperature at such a comfortable setting. I don't know anyone in the office who is better liked than you .

    You can perhaps help with this. The collection of contributions towards gifts for employees' personal-life events is becoming a little troubling. Certainly, the group sending of a gift is reasonable now and then. In the past month, however, there have been collections for two baby shower gifts, one wedding shower gift, two weeding gifts, one funeral remembrance, four birthday gifts, and three graduation gifts .

    It's not only the collected-from who are growing uncomfortable(and poor), but the collected-for feel uneasy receiving gifts from people who don't know them outside the office, who wouldn't even recognize their graduating children, their marrying daughters and sons, or their dead relatives.

    This is basically a kind gesture (and one that people think well of you for), but the practice seems to have become too wide-ranging and feels improper in today's office setting .

    Thank you for understanding .

    Charlie is a teacher and his wife, Maria is an artist. The night before last, just before the longest day of the year, Charlie was sitting in a deckchair enjoying the warm summer air when Maria touched his shoulder and he could tell immediately she was a little worried about something. He asked her what the matter was and she replied that there was a strange thing on the jacket that was hanging in the bedroom. They had both lived in the West Indies (西印度群岛) and had seen a lot of strange creatures in their house before. But now they were living in England and so Charlie just laughed and said he would have a look at the "thing".

    He walked to the bedroom. He saw a jacket hanging in the bedroom and went up to it to have a closer look at the "thing". The moment he touched it, the thing sprang into life. Now Charlie experiences fear like the rest of us but when this creature opened its wings, he jumped out of his skin and ran screaming from the room like a small child doing about 100 miles an hour.

    For a moment the next-door neighbours thought that Charlie was murdering his wife because of the noise they could hear. In fact, it was a bat that frightened Charlie.

    Eventually Charlie managed to trap the bat in a box and took it to the garden to let the bat fly. Maria, who had been playing the guitar while Charlie was upstairs, asked Charlie if he had found out what the thing was. "Oh, nothing to worry about", he said casually hoping that the terror could not be seen in his eyes, "it was just a bat."

    During my third year of university, I spent six months studying in Rio de Janeiro, Brazil. Many are worried about travelling to Rio but I promise, it is worth a visit. Now I want to share my top recommendations (推荐) for experiencing Rio less as a tourist but more like a native Brazilian.

    Pedra Bonita

    Rio is full of hiking routes, and some Brazilians love to spend an afternoon hiking. My favorite route of all has to be Pedra Bonita. Pedra Bonita involves a steep climb of about an hour through tall trees, and I admit it is difficult in Rio's heat, but you are rewarded at the top with a wonderful view of the city, standing high above the green landscape and blue sea below.

    Mureta da Urca

    One thing you are sure to find in Rio is an amazing sunset, but a lot of the best spots tend to be full of tourists. In my opinion, Mureta da Urca is the most relaxing place to watch the sun set over the silver sea, with the figure of Christ the Redeemer standing tall in the background.

    Pedra do Sal

    Pedra do Sal is a historical area in the city centre and on Monday nights it is brought to life by the sound of samba. Hundreds of people gather in the street, food and drink stalls are set up and it becomes a giant street party with everyone enjoying the happy sound of live samba!

    Picanha

    If there were one Brazilian food I could bring back to the UK, it would be picanha. It is the tastiest cut of steak I have ever tasted, served alongside rice and beans.