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Scientists set sail to piece together the final moments of The Titanic after it vanished below the waves. Laboratory-grown human skin cells could help repair ulcers. Testing carbon fibre beams to find if they can be used to repair London Underground tunnels. Expedition takes boats up Mt Kenya to learn about the African climate 4,000 years ago. The importance of goat droppings in devising an advance-warning weather forecasting system for east African farmers.