When someone is happy, can you smell it?

    You can usually tell when someone is happy based on seeing them smile, hearing them laugh or perhaps from receiving a big hug. But can you also smell their happiness? Surprising new research suggests that happiness does indeed have a scent, and that the experience of happiness can be transmitted through smell, reports Phys.org.

    For the study, 12 young men were shown videos meant to bring about a variety of emotions while researchers gathered sweat samples from them. All of the men were healthy and none of them were drug users or smokers, and all were asked to abstain from drinking or eating smelly foods during the study period. 

    Those sweat samples were then given to 36 equally healthy young women to smell, while researchers monitored their reactions. Only women were selected to smell the samples, apparently because previous research has shown that women have a better sense of smell than men and are also more sensitive to emotional signaling—though it's unclear why only men were chosen to produce the scents.

    Researchers found that the behavior of the women after smelling the scents—particularly their facial expressions—indicated a relationship between the emotional states of the men who produced the sweat and the women who sniffed them. 

    “Human sweat produced when a person is happy brings about a state similar to happiness in somebody who breathes this smell,” said study co-author Gun Semin, a professor at Koc University in Turkey.

    This is a fascinating finding because it not only means that happiness does have a scent, but that the scent is capable of transmitting the emotion to others. The study also found that other emotions, such as fear, seem to carry a scent too. This ensures previous research suggesting that some negative emotions have a smell, but it is the first time this has proved to be true of positive feelings.

    Researchers have yet to isolate(分离) exactly what the chemical compound for the happiness smell is, but you might imagine what the potential applications for such a finding could be. Happiness perfumes, for instance, could be invented. Scent therapies（香味疗法）could also be developed to help people through depression or anxiety.

    Perhaps the most surprising result of the study, however, is our broadened understanding of how emotions get communicated, and also how our own emotions are potentially managed through our social context and the emotional states of those around us. 

    Ask someone what they have done to help the environment recently and they will almost certainly mention recycling. Recycling in the home is very important of course. However, being forced to recycle often means we already have more material than we need. We are dealing with the results of that over-consumption in the greenest way possible, but it would be far better if we did not need to bring so much material home in the first place.

    The total amount of packaging increased by 12% between 1999 and 2005. It now makes up a third of a typical household's waste in the UK. In many supermarkets nowadays food items are packaged twice with plastic and cardboard.

    Too much packaging is doing serious damage to the environment. The UK, for example, is running out of it for carrying this unnecessary waste. If such packaging is burnt, it gives off greenhouse gases which go on to cause the greenhouse effect. Recycling helps, but the process itself uses energy. The solution is not to produce such items in the first place. Food waste is a serious problem, too. Too many supermarkets encourage customers to buy more than they need. However, a few of them are coming round to the idea that this cannot continue, encouraging customers to reuse their plastic bags, for example.

    But this is not just about supermarkets. It is about all of us. We have learned to associate packaging with quality. We have learned to think that something unpackaged is of poor quality. This is especially true of food. But it also applies to a wide range of consumer products, which often have far more packaging than necessary.

    There are signs of hope. As more of us recycle, we are beginning to realize just how much unnecessary material we are collecting. We need to face the wastefulness of our consumer culture, but we have a mountain to climb.

    In Britain, many theatres put on shows for children at Christmas and many theatres have a theatre­in­education team working there. This team, made up of actors and teachers, writes plays for children, usually performing them in schools. They do different plays for different age groups and the children often take part in the play in some way.

    Pantomime is a special kind of Christmas show for children. It is loved by people and also allows the audience (观众) to join in.＂Pantomime＂ was the name of the Roman actor who performed shows without speaking — this is where the English word ＂mime＂ comes from.

    A pantomime is always based on a well­known children's story. But there are always certain types of characters in the show and certain situations and events. For example, a pantomime must always include a hero, known as the ＂principal boy＂ and this principal boy is always played by a pretty girl wearing a short costume (服装). Then there is the comic older woman, known as the ＂dame＂ who is played by a man. There is always a group of men and women who sing and dance and often there is a pantomime horse. The horse is played by two men who form the ＂front＂ and ＂back＂ ends inside a ＂horse＂ costume. It is funny and it usually kicks the dame when she isn't looking.

    Members of the audience have to shout a warning to one of the characters and argue (争论) with the character (usually the dame) when she does not believe them. When she shouts, ＂Oh no, it isn't, ＂ the audience always responds with ＂Oh yes, it is!＂ The audience also learns and sings a simple song and a few children are sometimes invited to help one of the characters during the show.

    When Luke went to university he thought he would be on a new journey in life and getting his own place. In the UK, it's common to fly the nest at a fairly young age. Many choose a flat-share; others make plans to get on the property ladder.

    But the current economic situation forced Luke back to his mum's house at the age of 27. And he's not alone: a quarter of young adults in the UK now live with their parents. The Office for National Statistics said more than 3.3 million adults between the ages of 20 and 34 were living with their parents in 2013.

    Lack of jobs and the high cost of renting accommodation made Luke change his plans. He's upset. "There's something very difficult about being an adult living in an environment where you're still a child," he says. "It limits me socially; sometimes I feel it limits me professionally."

    Indeed, many young people have no choice but to stay at "the hotel of Mum and Dad".

    Krissy had to return home after a year away and now lives in rather terrible conditions, sharing the family's three-bedroom house with her sisters. She says they end up getting on each other's nerves when it's time to use the bathroom in the morning.

    Of course, living with your parents is not unusual in some countries. Economic conditions, culture, or family traditions mean many young people stay at home until they get married. Even then, it can be too expensive to rent or buy a house and the married couples continue to live at one of their parents' homes.

    But some parents seem to enjoy having their kids back at home. Janice's daughters are part of what's being called "the boomerang generation". She says, "I get to share their lives with them, and I've got to know them all as adults. We have the sort of conversations that good friends do."

    So for some it's a win-win situation — spending time with your families, and saving money.

    "Dreams may be more important than sleep. We all need to dream," some scientists say. Dreams take up about one quarter of our sleeping time. People have several dreams each night. Dreams are like short films. They are usually in colour. Some dreams are like old films. They come to us over and over again. That may be because the dreamer is worrying about something. Dreaming may be a way of trying to find an answer. Some people get new ideas about their work from dreams. They may have been thinking about their work all day. These thoughts can carry over into dreams.
    Sometimes we wake up with a good feeling from a dream. But often we can't remember the dream. Dreams can disappear quickly from memory. Too much dreaming can be harmful. The more we sleep, the longer we dream. The mind is hard at work when we dream. That is why we may have a long sleep and still wake up tired.

    College students may find a greener campus when they return to classes this fall. Some schools arc repairing older buildings and constructing new ones that arc better for the environment. Other steps include adding wind and solar energy systems and planting vegetable gardens.

    George Washington University（GW）is a private school with 200.000 students. The university has two gardens where students volunteer their time.

    Over the last ten years GW has developed projects in three main areas-climate, water and eco-systems. They have begun to create projects on the ground to address climate change, They are planning on becoming carbon-neutral（平衡的）and, in fact, reducing the footprint by forty percent by 2025, from creating solar hot-water systems on our rooftops to making our buildings much more energy efficient. The school also offers 140 different classes in sustainability （可持续性发展）and the environment.

    Mark Orlouski said. "We see numbers like less than 20% of school having a green building policy five years ago, and now upwards of 80% of schools having a policy, which states that their new buildings will be built in a green fashion.

    GW is located in the Foggy Bottom neighborhood of Washington. Some neighbors say that while GW is laying to be Friendlier to the environment, it could also be a better friend to the neighborhood. The school has expanded quickly and there have been tensions between students and local residents