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An immensely powerful yet invisible force pulls water from the earth to the top of the tallest redwood and delivers snow to the tops of the Himalayas. Now scientists from the Columbia University report the development of two novel devices that derive power directly from evaporation -a floating, piston-driven engine that generates electricity causing a light to flash, and a rotary engine that drives a miniature car. The paper's lead author Ozgur Sahin chats to Â鶹Éç Newsday's Tom Hagler. (Photo: Water droplet; Credit: Â鶹Éç)