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How to fly around the world without fuel

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Imagine if we could fly day and night using only solar energy. The expertly engineered Solar Impulse plane is flying around the world delivering a powerful message: clean technologies can achieve the seemingly impossible. Powered by a dream, determination and breakthrough engineering, this flying adventure aims to inspire and encourage people everywhere to commit to a more sustainable world.

How do the Solar Impulse pilots remain alert during flights lasting several days?

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