The fourth man was kneeling on the pavement fiddling with a bunch of wires leading from one of the trucks to a small TV set on a rickety little plastic table facing the chairs.

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Looking back at ya is a front-facing camera, and there's a plain plastic stylus tucked in the top, so we're certainly looking at a resistive touch display.

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The brief for the Plastiki Expedition was to design a boat made out of plastic bottles that could be sailed across the Pacific Ocean that would draw attention to the problems facing the oceans as well as the kind of solutions that we need to implement.

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David Dunaway, from the plastic surgery and craniofacial unit at Great Ormond Street, was the lead clinician and is also a trustee of Facing the World.

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