Further reading:

Bertrand Piccard’s website

https://bertrandpiccard.com/home

The story of the Solar Impulse round-the-world electric flight

https://aroundtheworld.solarimpulse.com/adventure

How to raise $170m for a crazy idea

https://www.linkedin.com/pulse/how-raise-170-million-crazy-idea-bertrand-piccard/

Solar Impulse Foundation/World Alliance for Efficient Solutions

https://solarimpulse.com/

The Greatest Adventure, book on the balloon circumnavigation by pilots Piccard and Jones

https://www.amazon.com/greatest-adventure-balloonists-round-world/dp/0747271283/ref=sr\_1\_1