The Solar Impulse 2 departs from the eastern Chinese city of Nanjing for Hawaii on early Sunday. The solar-powered aircraft needs plenty of sunlight to make the journey of six consecutive days and nights to Hawaii according to the pilot.Sign up for Snowmail, your daily preview of what is on Channel 4 News, sent straight to your inbox, here: http://mailing.channel4.com/public/snowmail/remotebox.jsp
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