| http://www.w3.org/ns/prov#value | - 4/10: Discover Solar Impulse 2 with Bertrand Piccard & Andr?? Borschberg, Co-Founders and Pilots of Solar Impulse (The Solar Impulse 2 is an airplane capable of flying around the world, powered only by the sun.) There are many more Hangouts available on a variety of subjects, including science and nature, arts and music, and social studies.
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