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Bertrand Piccard unveils solar plane for round-the-clock flights.

An exclusive interview with Swiss adventurer Bertrand Piccard, just after the unveiling of the Solar Impulse, the first aircraft designed to fly day and night on solar energy alone. It was round-the-world balloonist Piccard who spearheaded the project. (Isobel Leybold-Johnson and Julie Hunt, swissinfo.ch)