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Dust. You might hate it, you might want to get rid of it, you might not know where it comes from, but did you know there are actually two billion tonnes of dust lifted into the Earth\\u2019s atmosphere each year? Joining Jonathan to discuss the world of dust is researcher Jay Owens, who has written a new book called \\u2018Dust \\u2013 The Modern World in a Trillion Particles\\u2019.