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She won the International Feminine Aerobatic Championship for three years in a row, starting in 1948. She and her little Pitts Special plane the "Little Stinker" became famous.

BARBARA KLEIN: Dorothy Cochrane is an aviation expert at the Smithsonian Institution's National Air and Space Museum in Washington D.C. She has studied and worked with Betty Skelton.

DOROTHY COCHRANE: "Betty was such a wonderful aerobatic pilot that she really set the bar high for other women to follow behind her and she was a great role model for them. She really was as good as some of the men."

BARBARA KLEIN: Ms Cochrane says Betty Skelton flew during a period when men and women aerobatic pilots competed separately. And she set the example when later women did compete and win against men.

DOROTHY COCHRANE: "She also became the first woman to perform the inverted ribbon cut. And that's a very tricky thing to do."

BARBARA KLEIN: This flying trick involved using her plane's propeller to cut a ribbon held between two tall sticks. Betty Skelton did this while flying about three meters off the ground—upside down.

MARIO RITTER: Once Ms Skelton had made her mark flying, she moved on to racecars. She became the first female test driver in the racecar industry. She set several land speed records. She also set a cross-country record, driving from New York to California in under 57 hours. And, she became one of the top women advertising experts working with General Motors in support of the company's Corvette car.

DOROTHY COCHRANE: "She loved speed, that's part of who she was and that was part of her attraction to aviation. And then when she did all she could in aviation, she moved on to automobiles. She still had a beautiful red corvette that she was driving around the retirement community that she lived in, passing some of the golf carts that other people were driving."

MARIO RITTER: Ms Skelton died in August at the age of 85. Visitors to the Washington area can see her "Little Stinker" plane at the Smithsonian Museum's Steven F. Udvar-Hazy Center in Chantilly, Virginia. The small red and white plane hangs high in the air above the entrance to the museum. And as its former owner would have liked, the plane is hanging upside down.

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BARBARA KLEIN: Michael Hart is widely credited as the inventor of the first electronic book, or e-book. He also helped create Project Gutenberg, the first and largest free library on the Internet.

Mr Hart was born in 1947 in Tacoma, Washington, but grew up in Illinois. His father was a professor of Shakespearian literature and his mother was a mathematician.

MARIO RITTER: Michael Hart first became interested in the idea of information sharing while studying at the University of Illinois in the early 1970s. He had permission to use the university's mainframe computer. This huge machine was connected to a network of other computers. He later estimated that the time given to him on the computer network was worth about 100 million dollars. So, he wanted to come up with a project that was valuable enough to justify the cost of the technology.

BARBARA KLEIN: After attending an Independence Day celebration, Mr Hart received a free copy of the Declaration of Independence. He decided to type the words of the document on the computer and share this text with the computer network. He decided that this was worth 100 million dollars, because in the future hundreds of millions of people could use his copy of the Declaration of Independence.

This event marked the beginning of Project Gutenberg. Over the next ten years, Mr Hart added the Bible, William Shakespeare's plays and other texts to the project's storage system.

MARIO RITTER: Mr Hart said the goal of Project Gutenberg was to support the creation and spreading of e-books free of cost to computer users. He said this effort aimed to "break down the bars of ignorance and illiteracy."

Greg Newby is the head of the Project Gutenberg Literary Archive Foundation. He says Mr Hart's philosophy behind the project was about helping people.

GREG NEWBY: "He had this idea that through literacy, through access to literature really, people could become literate. And then through literacy people could become educated, and through education people could empower themselves to have more successful lives and eventually participate in making the world a better place."

MARIO RITTER: Today, Project Gutenberg contains more than 36,000 books. Most are no longer protected by copyright laws. Others are still protected by such laws, but were donated with the permission of the copyright owner. Project Gutenberg depends on volunteers to enter new books into its collection.

BARBARA KLEIN: Michael Hart once said that the Gutenberg Project represented a complete system change. It lets a person share his or her favorite book with millions of people.

GREG NEWBY: "Michael really was someone that sacrificed the ability to have what probably would have been a successful and, if he desired traditional career, to electronic books and to these principles of literacy and freedom of access to information."

BARBARA KLEIN: Mr Hart died earlier this month at the age of 64. He once told a newspaper that there were only two things in the world that were truly free and in endless supply. He said these were the air we breathe and the texts on Project Gutenberg.

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MARIO RITTER: This program was written and produced by Dana Demange. I'm Mario Ritter.

BARBARA KLEIN: And I'm Barbara Klein. Join us again next week for EXPLORATIONS in VOA Special English.

Inukitut: the name of some of the Inuit languages spoken in Canada 因纽特语

walrus: a type of large sea animal with huge tusks, related to the seal 海象

propeller: a device having blades radiating from a central hub that is rotated to produce thrust to propel a ship, aircraft, etc 螺旋桨

corvette: a lightly armed escort warship 轻巡洋舰；轻武装快舰

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（来源：VOA 编辑：张若琼）