Solar plane begins final leg of its world flight
Solar powered plane Solar Impulse 2 on Sunday took off from Cairo and headed towards Abu Dhabi, beginning its 17th and last leg of the first ever fuel-free round-the-world flight. It's expected to take 48 hours to reach Abu Dhabi. The plane, which cruises at an average speed of 75 kmph, began its journey on March 9, 2015 from Abu Dhabi.