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    Stephen Hawking was born in England in 1942. He is one of the most well-known scientists on space and time in the world. Hawking is researching how the universe began and how it ends. He is called the King of the Universe.

    When he studied math and science at Oxford University, he became seriously ill, which made him unable to speak or breathe without the help of machines. Till now, he can't move or feed himself and he is helped to dress, eat and wash by a nurse. However, he has a wheelchair with a special computer, with which he can communicate with others.

    In spite of all these difficulties, he refused to give up his hope of living and went on to study at Cambridge University after graduating from Oxford University. In 1965, he got a Doctor's Degree of philosophy(哲学). Because of his serious illness, it was difficult for him to draw diagrams or to write. So he started to think in pictures. With this new way of thinking, he is respected by people in the world. Then in 1988, he wrote his first important book, A Brief History of Time. It has been sold more than 5.5 million copies in 33 different languages. He was once invited to China to give lectures. His self-confidence and humorous conversations impressed us deeply.

    From Hawking's unusual experiences , we learn that nobody should lose hope, no matter how bad the situation is .As he once said, “Life is not fair, you just have to do the best you can in your own situation.”

    Everyone faces difficulties in their life. Daniel Kish was born with a special eye illness and lost his eyesight before he was only 14 months old.

Soon after, however, he started to do an amazing thing. He learned to make clicks (咔哒声) with his tongue to help him move around. Kish now moves about using sonar (声呐). He is so good at it that he can ride a bicycle by himself on public roads. And he started the organization World Access for the Blind (WAFTB) in 2000, teaching others how to use sonar. In the interview with National Geographic, he explains how the sonar works.

    "When I make a click sound, it produces sound waves. These waves reflect (反射) off surfaces all around and return to my ears. My brain then deals with the sound and turns it into pictures in my mind. Each click is like a camera flash, which helps me make a 3-D picture of my surroundings for hundreds of feet. It's like having a conversation with the environment."

    Kish feels it is exciting to ride a bike using sonar, although he needs to click twice a second, much more than he usually does. "It may sound a bit dangerous to move around the world in this way," he says. "But most people in the world live in fear of things that they imagine. I love hiking and mountain-biking. I go almost everywhere. And I've never had an accident and hurt myself."

    He is happy to be able to help more blind children to improve their life. "We've served over 10, 000 students in nearly 40 countries," he tells the reporter. "Many students are surprised how quickly results come. Seeing isn't in the eyes. It's in the mind."

Nature was Chen Rui's "childhood home". The 37-year-old researcher at the Chinese Academy of Sciences' Institute of Zoology was not able to talk until he was 4 years old because of the way his brain processes sensory (感官) information. 

This made him "strange" in some people's minds. So, he didn't have friends who were around his age, which led him to turn his attention to nonhuman things around him. He became enraptured by the world of insects. "The happiest time of my childhood was in the farm fields," says Chen. "I squatted there, observing the actions of insects. I had so many questions about their activities and was full of curiosity about this world." These experiences planted a seed in his heart. 

Many years later, he's an expert in life-science research. He has visited the Amazon rainforest several times, and has found around 100 new species (物种), many of which are named after him. 

"I was a child who was ‘cured (治愈)' by nature," he says. "I wanted to grow up to share the power of nature with more young people and to popularize understanding of animals, including insects. I wanted to start classes to bring children to learn in the open air and experience the gifts nature gives." These led him to recently publish the popular science book, Du Chong Ji (Reading About Insects) 

"Insects were the earliest creatures that could fly and feed themselves by farming. They have survived three mass extinctions (大规模灭绝). No other living things have won such victories." He hopes that people will learn and draw inspiration from the "superpowers" of insects and use it to improve their own lives. 

David was a bit too fat. He went to buy an exercise machine. He tried to 1 some weight(减肥).

At first, he put it in the basement (地下室).2 he did not use it often. He hardly (几乎不) went into the basement.

Next, he moved it into his 3 . But he still didn't use it very often. That's because he would only go into the bedroom when it was time for him to go to 4 . Finally, he moved it 5 the living room. He put the machine next to the 6 . His wife thought maybe this would finally work. He could exercise and 7 outside at the beautiful garden at the same time.

After about a week, his wife 8 David how his exercise was going. He said," Well, yes, I do 9 exercise these days. Every time I want to10 the window, I have to walk around the exercise machine."

Alena is from Texas. She dreamed of becoming an engineer at the age of 16 when she was 12 years old. It may sound impossible, but Alena is not a common girl. She's both clever and hard-working. She is now studying engineering at her dream university. She would love to build a rover (探测器) to go to space. 

Believe it or not, the story started with Lego (乐高) . At the age of4, Alena loved playing around with different kinds of Lego and showed great love for building things. Little Alena loved to look at the stars at night. Once, she said seriously, "Mom, I'm going to work for NASA. I'm going to travel to space in a rocket. " Her mom was surprised at the little girl's dream. She couldn't believe what she heard. 

Alena is planning to write a book for children. "I' d like to ask more girls to follow their dreams, " she said. 

Alena won't let anything stop her working hard for her dreams. "When I plan to do something, I just go for it, " she said.