How can you gain knowledge of the world without books or teachers? Visiting various kinds of world-famous museums may be your best choice. If you are interested ，here are 3 famous museums well worth visiting.
National Gallery, London 2017 attendance: 6,263,000

    The National Gallery originally opened in 1824 in a Pall Mall townhouse with just 38paintings. Today's collection contains over 2, 300 works from the 13th to 19th centuries, which you can appreciate free of charge. The works range in style and time period, but hey, everyone needs to see Van Gogh's Sunflowers in Room 43 at least once, for which the Museum is famous.

    Opening time: daily 10 am—6 pm Friday 10 am—9 pm

    Closed time: January and 24—26 December

    Admission: Free
National Air and Space Museum, Washington, D. C.

    2017 attendance: 7,500,000

    The National Air and Space Museum, part of the Smithsonian Institution, hosts the world's largest collection of aviation and space artifacts. You'll see crowds flocking toward the 1903Wright Flyer and Apollo 11command module, but don't forget about NASA's often—overlooked Stardust probe.

    Hours and Admission :Open every day except December 25.

    Free admission and tickets (free) are needed.

    ⒈A maximum of 4000 free tickets will be issued each day at the museum.

    ⒉Each visitor can once collect one free ticket of the day with valid ID (Passport ).

    Regular Hours :10:00 am to 5:30 pm

    Extended Hours :10:00 am to 7:30pm Fridays, Saturdays and Sundays

National Museum of China, Beijing

    2017 attendance: 7,550,000

    Founded in February 2003, this huge, well-curated museum sits on the edge of Beijing's Tiananmen Square and is free to enter. It houses more than 1.3 million exhibition pieces in its 40halls ，focused primarily on China's achievements in history, culture, and art.

    Opening Hours :9 :00—17:00

    (No Entry after 16:00) Closed on Mondays

    Museum Visiting Tips: Limit the number of bags( only one handbag is allowed ). All visitors are screened through metal detector upon entry. The fewer items you bring inside the Museum. Before you visit, please review the list of prohibited items, Visitors carrying prohibited items will not be allowed inside the Museum, s0 please leave them at home or in your car.

    No Food or Drink: Only bottled water is permitted in the Museum

    A Song of Ice and Fire is a seven-part series of fantasy written for adults. George R. R. Martin writes each chapter from the perspective of a specific character, providing a limited point of view for each section. The reader is able to understand the inner workings of the individual, but the reader is barred from a whole understanding of the text. The world he has created has magic, but there is much more than that. While magic exists, it exists on the edge, and the inner unrest of the characters is much more important.

    His work also has a level of realness that is astonishing in a work of fantasy. Characters are imperfect, and many make questionable moral choices. In the end, however, Martin shows that both good and bad happen to both the people of high moral standard and the corrupt. He has made it clear that any character can die at any point, which has led to a lot of heartbreak from readers.

    In 2011, A Song of Ice and Fire became a television series titled Game of Thrones. Martin has been closely involved with the production. It has currently run for seven seasons, and viewers anxiously await the eighth season to answer their questions from the season seven finale.

    His fans are also waiting for The Winds of Winter and A Dream of Spring, the next books in the series, to answer the questions Martin and the television show have not yet addressed. Martin, however, has no plans to rush. He has made it clear that he will continue to write the books while working on the television show and writing other novels.

    But how will the story continue? What is going to happen in Westeros, and more importantly: when are we going to find out? Martinis skill as a writer has kept readers and viewers spellbound. Many hope he will finish the next book before the next season of the show begins, but no one knows with Martin. He always keeps his readers guessing.

    In our twenties, we find it funny when we can't remember our neighbor's cat's name or a handsome actor who starred in a famous movie. In our thirties, we jokingly call it "brain freeze". In our forties, we laugh it off as a" senior moment" and follow up with one of these old age jokes. But the reality is that there comes a point when being forgetful stops being funny and starts to seem a bit dreadful. You think, "Am I losing it？"Or worse, "Is this a sign of Alzheimer's disease（老年痴呆症）？"

    Well, don't worry. The fact that you recognize your own forgetfulness may be a very good sign, at least in terms of the possibility of your developing Alzheimer's disease（AD）. The researchers in a new study show that it's not forgetfulness but not being aware that we're forgetful that we should fear.

    The researchers began with the assumption that one common feature of Alzheimer's dis-ease is a damaged awareness of illness. And they wanted to prove their theory that the lack of awareness can be used to predict whether someone with" mild cognitive（认知的）damage" will progress to full-on AD. For the study, "mild cognitive damage" was defined as someone whose mental state was considered healthy but who had either complained of memory loss or had suffered objective memory loss.

    The researchers used existing data for 1, 062 people between the ages of 55 and 90 that had been recorded over a 12-year period. The data included brain scans, which the researchers used to look for visual signs of reduced glucose uptake（葡萄糖吸收）.It is an objective marker of the sort of reduced brain function that goes along with AD.As expected, glucose uptake was reduced in those with AD. What the researchers also discovered was that glucose uptake was reduced in those with mild cognitive damage who also showed evidence of reduced illness awareness. Finally, the researchers found that those who had reduced illness awareness were more likely to develop AD than those without.

    A T-shirt a day has kept unemployment away for an American man who is making about $85,000 a year by selling advertising space on his shirt.

    Jason Sadler, 26, was once a former marketing expert from Florida. In 2008, he founded his own company, "I wear your shirt", with the idea to wear a T-shirt supplied by any company and then use social media tools to develop the company. Sadler charges the "face value" of the day for his human billboard (广告牌) service. So January 1 costs $1, while December 31 costs $365. He said this may not sound like a lot, but it adds up to $66,795 a year if he sells out every day, which he did this year. He also sells monthly sponsorships(赞助) for $1,500, adding another $18,000 to his income.

    "I walk around, take photos, wear the shirt all day … I blog about those photos, I put them up on Twitter, I change my Facebook introduction…and then I do a YouTube video. I made about $83,000 this year," he told Reuters Television. The average U.S income is about $615 a week or about $32,000 a year, according to the U.S government.

    Sadler has already begun to plan for his year 2010. He is making services larger by hiring another person to wear a shirt a day on the west coast of the United States.

    Reality TV show has been charged with making the nation silly, but a study suggests part of the show could be good for children.

    Massey University PhD student Jacinta Hawkins looked at the influence of TV programs on kids' health knowledge, attitudes and behavior. She said programs which showed overweight people on TV is making children say "I don't want to grow up like that'."

    The research was part of Ms Hawkins' paper on how schools improve health. She spoke to 92 children, ages from 7 to 13, from six Auckland primary schools to find out how they received information on nutrition and physical activity. Some said they learnt from TV news programs, but most of them mentioned reality shows such as Fat Chance, Honey We're Killing the Kids and Downsize Me.

    "Earlier studies had looked at the effect junk-food advertising had on children," Ms Hawkins said, "but messages within TV programs had not been explored. Children from the six schools largely recognized program content, rather than advertising, as a source of food and physical activity messages. They are learning habits of eating and exercise from TV programs. "

    The children also recognized that their parents had a role to play in shaping health behavior. Talking about Honey We're Killing the Kids, which shows how people will look if they continue with good habits, children said they developed attitudes from their family's habits. MMs Hawkins said children remembered what they had seen and thought it was the parents' duty to lead by example.

The Ig Nobel awards are usually known as the "Igs" and are given out every year at around the same time as the real Nobel awards. The "Igs" are given for achievements that "make people laugh, and then make them think". The name "Ig Nobel" is a language joke. "Nobel" sounds like "noble" -- meaning "very honored". And Ig Nobel sounds like "ignoble" meaning the opposite of noble — that is, "not honored"

    According to Marc Abrahars, who co-founded the award in 1991, "Most prizes, such as Nobel Prize, reward the goodness of the people who receive them. These prizes are meant to honor the extremes of humanity-those whose achievements should be seen as very good."

    "The Ig Nobel Prize isn't like that. The Ig honors the great confusion in which most of us exist much of the time. Life is confusing. Good and bad get all mixed up. If you win an Ig, it shows that you have done something. What that thing is may be hard to explain. But the fact is, you did it, and have been recognized for doing it."

    The Nobel science prizes encourage us to think that all over the world great discoveries are being made that will do good to the whole world. But real science is not like that. The main job of science is to find out what is not true. This leads people into areas of research that seem completely senseless. Why did a team of Japanese scientists spend months trying to teach birds to enjoy the paintings of Picasso? Why did a Norwegian biologist start a project to encourage insects to drink beer? It is hard to say. But it won them all an Ig.

    Sometimes science tells us things that we don't want or need to know. We don't want to know that falling in love and going mad are exactly the same as far as the brain is concerned. And we don't really need to know that worrying about money can cause tooth disease. Only the Ig award brought these great achievements to our attention.