Zothecula writes: Piloted solar flight has been a reality for some time, with even international flights (as made by the Solar Impulse) now possible. Up to this point, such voyages have been a strictly solo affair, however the team originally responsible for the Sunseeker II intends to change this by manufacturing what’s billed as the world’s first two-seater solar aircraft – a motor glider named the Sunseeker Duo. Link to Original Source
"The fundamental principle of science, the definition almost, is this: the
sole test of the validity of any idea is experiment."
-- Richard P. Feynman