Solar Impulse 2, an experimental solar powered airplane, has just taken off from Cairo for the final leg of its round-the-world journey.
"Just took off from Cairo to achieve the 1st round-the-world solar flight. A dream I have since 1999," pilot Bertrand Piccard tweeted after Solar Impulse 2 was airborne.
The plane is expected to land after 48 hours in the air.