If you put your history notes under your pillow (枕头) and sleep on them the night before an exam, will you do any better on the test? Most of us have hoped this might help. However, _______ can't go through the pillow into your brain. But that doesn't mean you can't learn while you sleep.  

    Scientists aren't exactly sure how it works, but they have discovered that the brain can learn things during sleeping hours.

    In one experiment(实验), researchers gave German speakers some Dutch words to learn. Then, they divided them into three groups. The researchers played Dutch words for people in Group 1 while they slept, without telling these German speakers what they were doing. The sound was low so it didn't wake them up, and only the newly introduced words were used.

    Another group listened to the same words while they were awake. The researchers found the people in Group 1 were better able to identify(确认) and translate the words later. This was true only for the words that were played while they slept. The third group listened to words while they walked. The walkers did not have the same success remembering the words as the sleeping group.

    The researchers later found that people had more slow-wave(慢波的) brain activity throughout the night. They said that more slow waves made people have better memory for the new words.

    There will be a kind of new cars in the future. People will like this kind of small cars better than the big ones. The car is as small as a bike. But it can carry two people in it. Everybody can drive it easily, just like riding a bike. Even children and old people can drive them to schools or parks.

    If everyone drives such cars in the future, there will be less pollution in the air. There will be more space for all the cars in cities, and there will also be more space for people to walk in the streets.

    The little cars of the future will cost less money to buy and to drive. These little cars can go only 65 kilometers an hour, so driving will be safer. The cars of the future will be fine for going around the city, but they will not be useful for a long trip.

    This kind of cars can save a lot of gas. They will go 450 kilometers, then they have to stop for more gas. They are nice cars, aren't they?

    China has recently published its first artificial intelligence(AI,人工智能) textbook for high school students in Shanghai to start AI lessons. Forty high schools around the country have become experimental bases for exploring AI education.

    The book, Fundamentals of Artificial Intelligence, includes the history of AI and how the technology can be used in areas such as facial recognition, public security and auto driving.

    Peng Yu is a teacher at the High School Affiliated(附属)to Shanghai Jiao Tong University. He took part in editing the textbook and said it would give guide to students. He said," The book has a good introduction to the area so that students can decide if they want to further study AI at college Students can also find out what they need to learn if they are interested in studying AI. For example, they have to learn Maths because it is the fundamental basis of AI."

    Peng said AI has improved the interest of many high school students already, but he still feels that they can learn much more by taking part in project—based learning programs. Peng is sure that everyone should learn some basic knowledge about AI because it will be part of our everyday lives. It is reported that China needs 5 million AI teachers to keep up with development in the future.

    Hiccup is a young Viking. Toothless is a dragon and he can give off fire with his mouth. They go through many ups and downs together in the How to Train Your Dragon(《驯龙高手》) movie series. Now they are back with a new film!

    In the last movie, they had to protect their home. Humans and dragons lived together happily there. But now, there are too many dragons. A man tries to kill them. He burns down parts of their home. Hiccup and Toothless have to look for a new world for dragons to live in. Will they find it? Find out by watching How to Train Your Dragon: the Hidden World.

    Dragon acts

    The How to Train Your Dragon movies are from the book series of the same name British writer Cressida Cowell wrote the 12—book series. They came out from 2003 to 2015.

    How to Train Your Dragon the Hidden World is the last movie in the series. It opened in Chinese mainland theaters on March 1. Toothless get his name because he has retractable(伸缩自如的)teeth.

    What do you see when you look at abstract (抽象的)art? Can you understand it? Does it look like anything?

    Abstract art became popular in the early 20th century. Artists did not want to paint, draw, or sculpt things exactly like they looked. They didn't want their art to be realistic(现实的). They were more interested in basic shapes and colours.

    Picasso is probably the most famous of these artists. He painted and drew in many, many styles. Sometimes he used a lot of blue colours (his "blue period"). Later, he used more red and pink colours (his "rose period"). Many of his other paintings are called "cubist (立体派的)" because they are made of painted squares.

    After a long time, Picasso's paintings became more and more abstract. He painted people and things using strange shapes. His work was so strange that many of his workmates didn't understand it.

    Kandinsky, another famous artist, used lines, shapes, and patterns to paint his subjects. His paintings also used strong colours to express feelings. Other artists like the surrealists (超现实主义画家)，were interested in subconsciousness (潜意识). Painters like Breton and Magritte used many symbols in their work. The meaning or subject of their work wasn't always clear. Dali, another surrealist artist, painted pictures that looked like dreams.

    There are still many abstract artists around the world. That's the way many artists prefer. They want each person to look at art and find their own meaning in it.