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Irish billionaire Denis O'Brien tells Lesley Curwen why he invests in sometimes unstable far-off places. His Digicel mobile group operates in dozens of Caribbean islands, Honduras, Haiti, Fiji, Tonga and Papua New Guinea. It is the biggest investor in Haiti, with 2.4 million subscribers there. Plus, the Â鶹Éç's Kristina Block reports from a Big Top in western Siberia on a new era for the Russian circus industry, and technology commentator Jeremy Wagstaff discovers the background hum of a coffee shop may help you think and work better.