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Nigeria's currency, the naira, has fallen to a record low value this week. We look at how Africa's largest economy has suffered hard from the global fall in oil prices. Skype is introducing a new real-time translating service - the Â鶹Éç's technology correspondent Rory Cellan-Jones explains how it could be useful beyond the realm of overseas romance. And we speak to the founder of board game Market Madness, to find out why risking financial crises and stock market crashes has become a hit. Finally, we discuss the week's biggest global business stories with Devindra Hardawar from Engadget in New York and Oliver Ralph from the Financial Times in London.