Ben Franklin's Articles in Science
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The Legacy of the Helicopter Developed by Design
Most helicopters have a single main rotor though and a smaller one which produces a horizontal force at the tail of the helicopter.
The Ingenious Design Behind the Helicopter's Success
The helicopter has only one engine, and this engine is used to spin the rotor.
Past Achievements, Future Plans for Space Exploration
The space race was a challenge between the USSR and the United States to see who could land a man on the moon first.
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