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Trump still uses his personal mobile phone. Security experts are baffled. Also: A lack of immigrant labour in the US has some farmers planning for robots to pick produce; a Dutch teenager came up with a plan to clean up the world’s oceans and now he’s got funding for it, but at least one expert does not think it will work; fake turtle eggs get fitted with GPS trackers to catch poachers; plus we meet a Yoruba priest who also makes hypnotic electronic music. (Image: Donald Trump speaks on his mobile phone in in Potomac Falls, Virginia, U.S., on Thursday, April 30, 2009. Credit: Mannie Garcia/ Getty Images)