Currently offered by some famous universities, MOOCs are attractive to people who do not have the financial resources to meet the growing costs of university education, or who do not have formal qualifications. They also allow participants to study at their own pace.

    The potential for MOOCs to deliver education is obviously vast—they could be considered as a huge step forwards in widening participation. They also have the potential to provide a unique window on universities that offer popular and valuable courses, they may attract some participants to register for formal fee-paying programmes at the same or other universities and are likely to promote new ways of on-line education.

    However, it is still very early days for MOOCs. The quality of the education provision is highly variable, with many courses offering only recordings of lectures, and delivery is particularly difficult in some special fields that require practical classes, research projects or extensive library access. Besides, wider engagement with participants requires very considerable resource. Even limited feedback or examination becomes a major task if there are several thousand students in the class.

Considering the challenges, some people argue MOOCs will soon evaporate (蒸发). But they certainly provide good opportunity for widening higher education, are a means of raising awareness of universities to audiences of tens or hundreds of thousands, and are well worthy of serious consideration.

    It is now mandatory(强制) for drivers or passengers to wear seatbelts while in a car in all states. In addition, it is also mandatory for kids of be in some kind of specialized car seat. Given the strict requirements in other vehicles, why don't buses have seatbelts?

    The main answer, at least for school buses, is that seatbelts do not make school buses safer. Overall, traveling on school buses is the safest way to travel—40 times safer than riding in a car—with only a handful of deaths occurring to passengers on school buses every year. The seats on the school bus are placed very close to each other and have high backs that are thickly padded. As a result, in an accident the students would be propelled forward a very short distance into a padded seatback that in a way is like an airbag. In addition, the fact that people sit high off the ground on school buses also makes it safer to travel on them.

    While school buses feature high backed seats and elevated seating locations, the same cannot be said of city buses. However, from a practical angle, there's little need to require seatbelts on city buses. Although the design of the modern low—floor city bus is less safe than the design of school buses, the fact that city buses rarely travel at speeds greater than 35 miles per hour means that any collision is likely to be small, Also, given that most trips on city buses are short and that many trips have standing passengers, the presence of seatbelts will make even less of a difference.

    Another answer why buses do not have seatbelts is cost. It is estimated that adding seatbelts to buses would add between $8,000 and $15,000 to the cost of each bus. In addition, seatbelts would take up room currently used as seats, meaning that each bus would have fewer seating places. The additional room in the bus taken up by seatbelts would mean that bus fleets would have to increase by as much as 15% just to carry the same number of people. Such an increase would be especially difficult in cities that experience overcrowding on their vehicles.

    Regardless of whether their passengers have seatbelts, all buses provide seatbelts for drivers and most bus companies make their drivers wear seatbelts in order not to be influenced by a collision.

    Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did do. So start off to travel around the world and to experience a lot.

    Enjoy much freedom.

    You will enjoy a much greater sense of freedom when no one is able to tell you what to do{#blank#}1{#/blank#}You decide where you want to go,what you want to do and how long you want to stay.

    Taste delicious food.

    {#blank#}2{#/blank#}Do you like eating Chinese,Thai or Indian food?You will enjoy the food even more when you eat it from the place it originates（起源）.For foodies（吃货）,delicious food in different places on the journey is what attracts them most.

    Meet new people.

    You will have the chance to meet new people when you travel.Some are interesting,some boring,and some totally crazy.{#blank#}3{#/blank#}Chances are that it will be worth listening to.Perhaps you will meet someone you can make friends with and get a life-long friendship.

    Appreciate beautiful nature.

    Instead of looking out your office window to see a hundred skyscrapers staring back at you,you will get the chance to see the world in all its natural beauty.{#blank#}4{#/blank#}You can walk throw the jungles of the Amazon.You can see most scenery with your own eyes instead of looking at a still image in a book.

    {#blank#}5{#/blank#}You might already be book-smart.But add street smart to your life and then there's no stopping you.Travelling teaches you many of life's lessons.You will gain pearls（珍殊）of wisdom along your journey,which will surely enables you to lead a smarter life.

A.You are the boss.

B.Live a colorful life.

C.Become street-smart.

D.Everyone has a story to tell.

E.You can see the deserts of Africa.

F.You will discover how simple life can be.

G.You will taste food from all corners of the world.

Why the youth sense anger in faces

    We tend to believe that older people are more positive and younger people are more sensitive to social cues (暗示).

    Recently scientists investigated this idea by testing 10,000 men and women. They wanted to see if age affected a person's ability to identify facial emotions, such as fear and anger.

    The researchers from McLean Hospital in the US used a Web-based platform to collect happiness data. It showed the participants two headshots (头部特写)of random people. They were then asked to identify which subject was angrier, happier, or more fearful.

    The research found that younger people were able to better identify angry and fearful facial cues than older people.

    "From studies and anecdotal evidence, we know that the everyday experiences of an adolescent are different from an older person, but we wanted to understand how these experiences might be linked with differences in basic emotion understanding,wrote Laura Germine, the study's senior author.

    But what is it that makes young people more sensitive?

    "This is the exact age when young people are most sensitive to forms of negative social cues, such as bullying," Lauren Rutter, the study's lead author, told Science Daily. "The normal development of anger sensitivity can contribute to some of the challenges that arise during this phase of development.

    On the contrary  across the whole 10,000-person survey, researchers found no decline in the perception (感知)of happiness among older participants.

    "What's remarkable is that we see declines in many visual perceptual abilities as we get older, but here we did not see such declines in the perception of happiness, Germine told Neuro Science News.

    She added that these findings fit well with other researches, showing that older adults tend to have more positive emotions and a positive outlook.

    Following the paper's release, Rutter told Neuro Science News that gathering their primary research online allowed the team to research into a "much larger and more diverse sample set" than previous studies.

    Many of the most memorable ad campaigns nowadays tend to be funny. Advertisers use this strategy to attract customers to their products. Audiences like to be entertained not forced. People will pay more attention to a humorous commercial than a factual serious one opening themselves up to be influenced. The key to funny advertising is assuring the humor is appropriate to both the product and customers. The balance between being funny and being obnoxious can often be delicate, and a marketer must be certain the positive effects outweigh the negative before an advertisement can be introduced.

    The best products to sell using humor tend to be those that consumers think the least about. Products that are relatively inexpensive and often consumable can be represented without providing a lot of facts, and that's where there's room for humor. Candy, too, food, and entertainment-related products such as toys have got the most benefits from humor in their campaigns. One of the most important things to keep in mind is relevance to the product.

    Another point to consider when using humor in advertising is that different things are funny to different people. A commercial that may make one person burst into laughter may leave a bad taste in another's mouth. The target market must always be considered, what's funny in a client presentation may not be funny on an airplane, at a country club or in hospital.

    Humor in advertising tends to improve brand recognition but does not improve product recall message credibility, or buying intentions. In other words, consumers may be familiar with a good feeling towards the product, but their purchasing decisions will probably not be affected. One of the major keys to a successful humorous campaign is variety. Once a commercial start to wear out, it's impossible to save ii without some variation on the concept Humorous campaigns are often expensive because they have to be constantly changed. Advertisers must remember that while making customers laugh, they have to keep thing interesting because old jokes die along with their products.