In American schools there is something called Homecoming Day. Many high schools and colleges with a football team have a homecoming game. This can be the most important event of the year except graduation or commencement day(毕业典礼)．Students plan Homecoming Day for many weeks in advance.

    Several days before Homecoming，students start to decorate the school. There are signs to wish luck to the team，and many other signs to welcome all the graduates. Many people still come to Homecoming twenty or thirty years after their graduation.

    The members of school clubs build booths(摊位) and sell lemonade(柠檬)，apples and sandwiches. Some clubs help to welcome visitors.

    During the day people like to look for teachers that they remember from long ago. Often they see old friends and they talk together about those happy years in school.

    Everyone soon comes to watch the football game. When the game is half over，the band comes onto the field and plays school songs. Another important moment is when the Homecoming Queen or King appears. All the students vote a most popular student. It is a great honor to be chosen.

    Homecoming is a happy day，but it is not perfect unless the football team wins the game. Even if the team loses，the students still enjoy Homecoming. Some stay at the school to dance，and others go to a party. For everyone it is a day worth remembering.

    Anki has introduced Cozmo, a little robot powered by an advanced artificial intelligence. Cozmo promises to be far more interactive（互动的）than any toy robot.

    Cozmo, which can lie in your hand, has a “brain”—technically its CPU—that can process data amazingly fast. In addition Cozmo has a playful personality. He's designed to react to emotions and even ask users to play with him.

    Cozmo is not the first interactive toy to reach the market nor is it the first robot toy. What sets Cozmo apart from the other “smart toys” is that it has greater play value than those toys, which can become repetitious all too quickly.

    “Every interaction with Cozmo is different, so you do not put up with repetitive patterns and responses typically found with other preprogrammed robots,” explained Anki spokesperson Peter Nguyen. Because it has functionality that is similar to that of video games, Cozmo also can receive regular updates, which could extend its playability. Still, Anki has designed this toy to be just that: a toy. It's not an advanced computerized robot. Its software is app-based.

    Cozmo lacks the “traditional” human-like robot form factor of legs, arms and a head. But Cozmo does have an OLED screen / face with blue eyes, which in fact were designed to help it connect with its user.

    “I'm glad my kids are already raised,” said Roger L. Kay, analyst an Endpoint Technologies Associates. “Otherwise, they might become more antisocial if their relationship with Cozmo is more satisfying than those with real people,” said Kay. “Cozmo might encourage kids to learn more about technology or even inspire them to try programming and similar studies,” said Charles King, analyst at Pund-IT.

    Yet this technology does promise to be more than a toy. “It's a pretty cool invention and might have further applications, for example in elder care,” suggested Kay.

    When the sun sets in Hong Kong, the city skyline comes alive. Billboard（广告牌）lights flash, and light up the crowded streets. The colorful lights from the tall buildings are one of the city's main attractions.

    “Oh, my god. The lights are so amazing. We love it. It's so nice.” said one visitor.

    But this appreciation is not shared by everyone in Hong Kong. Lat year then government reported a record number of complaints. The curtains may be drawn. But residents argue the bright light outside is hard to escape. “We receive some complaints about the light pollution. They find it very hard to sleep or they have disturbance from the light outside.”

    Scientists at the University of Hong Kong spent 18 months studying levels of light pollution and collecting more than 5 million measurements. They found Hong Kong one of the world's worst “victims”. The lights pollution condition in Hong Kong was extremely severe. Particular in cities, the night sky brightness, as well as the lights, is a few hundred times over the level of that of a night sky without light pollution. In cities such as Seoul, London, Shanghai and Paris, billboard lighting is under control. And there are punishments for people who go against the law.

    But in Hong Kong, there are no laws. A volunteer regulation called Charter of External Light（户外灯光约章）encourages visitors to switch off between 11 p.m. and 7 p.m. The critics say it's not enough to make a difference. The government says 4800 businessmen have signed up to the Charter so far. And it's satisfied that it's working.

    But not everyone is convinced and some residents are taking upon themselves to act. Zoe Chow led a campaign to have a commercial building switch off their midnight. She won but she believes the lights will eventually turn back on. “I know that the building has signed the Charter of External Light. But it is voluntary, not mandatory（强制的）.

    Road trip

    Motorhome delivery offers great family holidays. For just $1 a day, you can hire a fully-equipped motorhome, which you deliver to a specific destination within some days and kilometers. You then hire another one to get home or take a bus or train. Your only other expense will be fuel and about $20 a day for parking fees. To learn more, visit apollocamper. com.

    Plan ahead

    For a comfortable break, flexibility with times, dates and places helps lower the cost. Find a few hotels you like, ask about their vacant rooms, then wait a few weeks and call again. If they still have rooms, you're at an advantage to ask for a better price. Lots of last-minute deals are online. Watif (watif. com. au) has deals on hotels that have dropped their prices so slow. You don't know where you're staying until it's booked, but anywhere with four or five stars has to be fairly good.

    Back to nature

    Wild camping appeals to nature lovers and costs nothing. This is forbidden on beaches and parks in most urban areas, but you can turn up in more distant area as long as nobody owns the land. You'll need to take everything with you and may need to shop on eBuy (ebuy. com. au). If you're a camping beginner, be aware of safety measures and get your questions answered on the Internet.

    Swap meet

    How about a home swap? For a $250 yearly joining cost, you can stay in someone's home in an international place of your choice while they or someone else stays in yours. Find out more at familylink.com.au.

    There has, in recent years, been an outpouring of information about the impact of buildings on the natural environment. Information which explains and promotes green and sustainable construction design, strives to convince others of its efficacy (功效) and warns of the dangers of ignoring the issue. Seldom do these documents offer any advice to practitioners, such as those designing mechanical and electrical systems for a building, on how to use this knowledge on a practical level.

    Although there are a good many advocates of "green" construction in the architectural industry, able to list enough reasons why buildings should be designed in a sustainable way, not to mention plenty of architectural firms with experience in green design, this is not enough to make green construction come into being. The driving force behind whether a building is constructed with minimal environmental impact lies with the owner of the building; that is, the person financing the project. If the owner considers green design unimportant, or of secondary importance, then more than likely, it will not be factored into the design.

    The commissioning (委任) process plays a key role in ensuring the owner gets the building he wants, in terms of design, costs and risk. At the predesign stage, the owner's objectives and expectations are discussed and documented. This gives a design team a solid foundation on which they can build their ideas. Owners who skip the commissioning process, or fail to take "green" issues into account when doing so, often come a cropper once their building is up and running. Materials and equipment are installed as planned, and, at first glance, appear to fulfil their purpose adequately. However, in time, the owner realizes that operational and maintenance costs are higher than necessary, and that the occupants are dissatisfied with the results. These factors in turn lead to higher ownership costs as well as increased environmental impact.

    In some cases, an owner may be aware of the latest trends in sustainable building design. However, firms should not take it as read that the client already has an idea of how green he intends the structure to be. Indeed, this initial interaction between owner and firm is the ideal time for a designer to outline and promote the ways that green design can meet the client's objectives, thus turning a project originally not destined for green design into a potential candidate.

    Typically, when considering whether or not to adopt a green approach, an owner will ask about additional costs or return for investment. In a typical project, landscape architects, mechanical and electrical engineers do not become involved until a much later stage. However, in green design, they must be involved from the outset, since green design demands interaction between these disciplines. This increased cooperation clearly requires additional cost. However, there may be financial advantage for the client in choosing a greener design. There are examples of green designs which have demonstrated lower costs for long-term operation, ownership and even construction.

With all the dietary information online, it can be hard to know what tips to follow. Watch out for these words and expressions.

Fat Is Good

It doesn't matter if you are part of the fat is GOOD for you or BAD for you group, the important question to ask is the source of the fat. If it comes from a land-based animal, and is likely to be solid at room temperature, then it is saturated （饱和的） fat whereas if it comes from fish or plants, and it is likely to be liquid at room temperature, then it is unsaturated fat. All the evidence indicates that eating more unsaturated fat than saturated fat lowers your risk of dying early.

Natural Sugar Is Better

The vast majority of sugar we consume is sucrose （蔗糖）. It is the white powdered stuff we cook with and is made up of glucose and fructose. How about sugar from honey? It is often marketed as natural and better for you. Actually, it just has its own distinct flavour, but is as sweet because of glucose and fructose.

High-pH Water

Some people think we need to eat alkali （碱） food to maintain our blood at a pH of 7.4. But everything we eat or drink passes through the stomach, which, at a pH of 1.5, is the most acidic part of the body. It is then neutralised to a pH of 7. So, nothing we eat will change the pH of our blood.

Don't Eat Anything That You Can't Pronounce

Whether foods are natural or highly processed, they are all full of chemicals. Are you supposed to fear "phenylthiocarbamide", because you can't pronounce it? This is simply the chemical responsible for the bitter taste found in brassicas, the plants in the cabbage and mustard family.

Don't Eat Food With More Than Five Ingredients（佐料）

Simple foods are not necessarily healthier for you. If I, for instance, use Chinese five spice powder in a recipe, that would count as one of the five ingredients. However, what if I added the typical components of five spice powder separately into a dish? Does that mean my recipe suddenly becomes bad because it has more than five ingredients?