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Solar Plane Leaves Cairo on Last Leg of Flight Around World

Solar Impulse 2, an aircraft powered only by the sun's rays, took off from Cairo Sunday morning on what should be the last leg of its history-making flight around the world. If all goes as planned, pilot Bertrand Piccard will steer the plane across the Arabian Peninsula and land in Abu Dhabi early Tuesday, completing the first global airplane flight using only energy from the sun — not a single drop of aviation fuel. Piccard and the project's co-founder, Andre Borschberg, have...

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