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Bertrand Piccard and his crew presented the first airplane to be flying with only solar power. In the presence of the Swiss Minister for Traffic and Environment, Moritz Leuenberger, and HH Prince Albert II of Monaco, the new aircraft Solar Impulse was unveiled at the military airbase in Dübendorf, Switzerland.

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The sight of a dam – one of the largest and most complex structures that humanity has ever created – can be quite breath-taking. Take a look at some of the most spectacular of these structures.

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The Rhine is a legendary river.