After 12 years of complex designs and (1) _______ training, aviation pioneers Bertrand Piccard and Andre Borschberg are set to (2) _______ new heights in human (3) _______ history. They plan to drive Solar Impulse 2 to achieve the longest ever flight in terms of duration for a single pilot, attempting to fly nonstop for 120 hours over oceans and (4) _______ without a drop of fuel. The wings of Solar Impulse 2 are covered with solar cells which provide electronic motors with (5) _______ energy, while its batteries can store enough (6) _______ energy throughout the day for the flying at night. Every component in the tiny (7) _______ has been precisely calculated to achieve maximum energy (8) _______ while this design (9) _______ the pilot can live there for several days. In order to set this record successfully, the two pilots are fully aware that their mental health is as (10) _______ as the technical training they have been conducting. They are set to begin their 35,000-kilometer flight in March 2015.