Solar Impulse 2 takes off on final flight

Solar Impulse 2 took off from Cairo early Sunday local time in the final leg of its around-the-world journey that started more than a year ago.

The experimental, solar-powered airplane is headed to Abu Dhabi, where it began its trip in March 2015.

The 14-year solar project, estimated to cost more than $100 million, to help promote clean technologies.

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